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Goodwill and Other Intangibles - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2025
Goodwill And Other Intangible Assets [Line Items]
Other intangible assets	$ 7,019	$ 8,290	$ 7,135
Impairment of goodwill		19,509
Operating Segments \| Medical Segments
Goodwill And Other Intangible Assets [Line Items]
Impairment of goodwill		$ 19,509
Trade Names [Member] \| Medical Segments
Goodwill And Other Intangible Assets [Line Items]
Non-cash impairment charges	$ 530

- Definition

Amount of impairment loss from asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

+ References + Details

Restructuring - Additional Information (Detail) - USD ($)

12 Months Ended

Dec. 31, 2026

Dec. 31, 2025

Dec. 31, 2024

Dec. 31, 2023

Restructuring Cost And Reserve [Line Items]

Restructuring expenses

$ 12,476,000

$ 13,110,000

$ 4,739,000

Cash payments for restructuring expenses

9,262,000

10,926,000

Benefit from sale of previously reserved inventory

4,554,000

Impairment of goodwill

19,509,000

Inventory

Restructuring Cost And Reserve [Line Items]

Non-cash impairment charges

6,064,000

Other Restructuring Activities | Maximum

Restructuring Cost And Reserve [Line Items]

Additional restructuring costs

1,000,000

2025 EMEA Plan | Maximum

Restructuring Cost And Reserve [Line Items]

Restructuring charges for capital expenditures

$ 2,000,000

2025 EMEA Plan | Minimum

Restructuring Cost And Reserve [Line Items]

Restructuring charges for capital expenditures

1,000,000

2025 Asia Plan | Maximum

Restructuring Cost And Reserve [Line Items]

Restructuring charges for capital expenditures

3,000,000

2025 Asia Plan | Minimum

Restructuring Cost And Reserve [Line Items]

Restructuring charges for capital expenditures

2,000,000

2025 Manufacturing Foot Print Plan | Maximum

Restructuring Cost And Reserve [Line Items]

Restructuring charges for capital expenditures

2,000,000

2025 Manufacturing Foot Print Plan | Minimum

Restructuring Cost And Reserve [Line Items]

Restructuring charges for capital expenditures

1,000,000

Employee Separation Costs

Restructuring Cost And Reserve [Line Items]

Cash payments for restructuring expenses

5,880,000

9,593,000

Employee Separation Costs | Other Restructuring Activities

Restructuring Cost And Reserve [Line Items]

Restructuring expenses

9,057,000

3,208,000

Employee Separation Costs | Other Restructuring Activities | Automotive Segments

Restructuring Cost And Reserve [Line Items]

Restructuring expenses

1,153,000

Restructuring Cost Benefit

262,000

Employee Separation Costs | 2023 Manufacturing Footprint Rationalization

Restructuring Cost And Reserve [Line Items]

Restructuring expenses

1,839,000

538,000

Employee Separation Costs | 2025 EMEA Plan

Restructuring Cost And Reserve [Line Items]

Restructuring expenses

3,604,000

Employee Separation Costs | 2025 Asia Plan

Restructuring Cost And Reserve [Line Items]

Restructuring expenses

2,270,000

Employee Separation Costs | 2025 Manufacturing Foot Print Plan

Restructuring Cost And Reserve [Line Items]

Restructuring expenses

2,190,000

Other Restructuring

Restructuring Cost And Reserve [Line Items]

Cash payments for restructuring expenses

3,382,000

1,333,000

^[1]

Other Restructuring | 2025 EMEA Plan | Maximum

Restructuring Cost And Reserve [Line Items]

Restructuring expenses

3,000,000

Other Restructuring | 2025 EMEA Plan | Minimum

Restructuring Cost And Reserve [Line Items]

Restructuring expenses

2,000,000

Other Restructuring | 2025 Asia Plan

Restructuring Cost And Reserve [Line Items]

Restructuring expenses

1,000,000

Other Restructuring | 2025 Manufacturing Foot Print Plan

Restructuring Cost And Reserve [Line Items]

Restructuring expenses

1,000,000

Other Costs | Other Restructuring Activities

Restructuring Cost And Reserve [Line Items]

Other restructuring costs and expense

1,760,000

834,000

Other Costs | Other Restructuring Activities | Automotive Segments | Relocation of Certain Manufacturing Units

Restructuring Cost And Reserve [Line Items]

Restructuring expenses

872,000

Other Costs | 2023 Manufacturing Footprint Rationalization

Restructuring Cost And Reserve [Line Items]

Restructuring expenses

645,000

$ 454,000

$ 159,000

Other Costs | 2025 EMEA Plan

Restructuring Cost And Reserve [Line Items]

Restructuring expenses

1,178,000

Other Costs | 2025 Asia Plan

Restructuring Cost And Reserve [Line Items]

Restructuring expenses

$ 826,000

Employee Severance and Retention Costs | 2025 EMEA Plan | Maximum

Restructuring Cost And Reserve [Line Items]

Restructuring expenses

6,000,000

Employee Severance and Retention Costs | 2025 EMEA Plan | Minimum

Restructuring Cost And Reserve [Line Items]

Restructuring expenses

4,000,000

Employee Severance and Retention Costs | 2025 Asia Plan | Maximum

Restructuring Cost And Reserve [Line Items]

Restructuring expenses

3,000,000

Employee Severance and Retention Costs | 2025 Asia Plan | Minimum

Restructuring Cost And Reserve [Line Items]

Restructuring expenses

2,000,000

Employee Severance and Retention Costs | 2025 Manufacturing Foot Print Plan | Maximum

Restructuring Cost And Reserve [Line Items]

Restructuring expenses

4,000,000

Employee Severance and Retention Costs | 2025 Manufacturing Foot Print Plan | Minimum

Restructuring Cost And Reserve [Line Items]

Restructuring expenses

$ 3,000,000

[1]	Includes gain on sale of the Greenville facility

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2025

Accounting Policies [Abstract]

Basis of Presentation

The consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”).

Principles of Consolidation

The consolidated financial statements include the accounts of the Company, its wholly owned subsidiaries and those entities in which it has a controlling financial interest. The Company evaluates its relationship with other entities for consolidation and to identify whether such entities are variable interest entities (“VIE”) and to assess whether the Company is the primary beneficiary of such entities. Investments in affiliates in which Gentherm does not have control but does have the ability to exercise significant influence over operating and financial policies are accounted for under the equity method. When Gentherm does not have the ability to exercise significant influence (generally when ownership interest is less than 20%), investments in affiliates are measured at cost, less impairments, adjusted for observable price changes in orderly transactions for identical or similar investments of the same issuer.

Intercompany transactions and balances between consolidated businesses have been eliminated.

Use of Estimates

In preparing these consolidated financial statements, management was required to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses. These estimates and assumptions are based on our historical experience, the terms of existing contracts, our evaluation of trends in the industry, information provided by our customers and suppliers and information available from other outside sources, as appropriate. These estimates and assumptions are subject to an inherent degree of uncertainty. We are not presently aware of any events or circumstances that would require us to update such estimates and assumptions or revise the carrying value of our assets or liabilities. Our estimates may change, however, as new events occur and additional information is obtained. As a result, actual results may differ significantly from our estimates, and any such differences may be material to our financial statements.

Business combinations

Business Combinations

In accordance with ASC Topic 805, “Business Combinations,” acquisitions are recorded using the acquisition method of accounting. The Company includes the operating results of acquired entities from their respective dates of acquisition. The Company recognizes and measures the identifiable assets acquired, liabilities assumed, and any non-controlling interest as of the acquisition date fair value. The excess, if any, of total consideration transferred in a business combination over the fair value of identifiable assets

acquired, liabilities assumed and any non-controlling interest is recognized as goodwill. Costs incurred as a result of a business combination other than costs related to the issuance of debt or equity securities are recorded in the period the costs are incurred. During the measurement period, which may be up to one year from the acquisition date, the Company may record adjustments to assets acquired and liabilities assumed with the corresponding offset to goodwill.

Revenue Recognition

Revenue is recognized from agreements containing enforceable rights and obligations, when promised goods are delivered or services are completed. Taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction, that are collected by the Company from a customer, are excluded from product revenues. Shipping and handling fees billed to customers are included in product revenues, while costs of shipping and handling are included in cost of sales.

Automotive Revenues

The Company generates revenue from the production of automotive parts sold to its customers under long-term supply agreements (“LTAs”). The duration of an LTA is generally consistent with the life cycle of a vehicle; however, a LTA does not reach the level of a performance obligation until Gentherm receives either a purchase order and/or a materials release from its customer for a specific number of production parts at a specified price, at which point an enforceable contract exists. Revenue is recognized when control of the production parts has transferred to the customer according to the terms of the contract, which typically occurs at a point in time when the parts are shipped or delivered to the customer’s premises.

Revenue is measured as the amount of consideration we expect to receive in exchange for transferring production parts. Transaction price is determined based on the price and quantity of parts specified in the contract with the customer at the time of shipment, adjusted for discrete price adjustments and consideration payable to a customer. Discrete price reductions may occur to remain competitive with market prices. These price reductions are negotiated based on changes in product specifications, product content/cost or other commercial factors. Some of these amounts include estimates of variable consideration which are recorded at the most likely amount to which the Company expects to be entitled based on historical experience and input from customer negotiations.

From time to time, the Company provides cash incentives to customers in exchange for new business awards. The Company evaluates the underlying economics of each amount of consideration payable to a customer to determine the proper accounting by understanding the reasons for the payment, the rights and obligations resulting from the payment, the nature of the promises in the contract, and other relevant facts and circumstances. When the Company concludes that the payment is incurred only if the new business is obtained and the Company expects to recover the amounts from the customer over the term of the new business arrangement, the Company recognizes these payments as an asset. The Company amortizes the asset as a reduction of revenue as products related to the payment are transferred to the customer, based on the total amount of products expected to be sold over the term of the arrangement (generally 5 to 10 years following start of production). The Company evaluates the amounts capitalized each reporting period for recoverability and recognizes a reduction of revenue for any amounts that are no longer expected to be recovered over the term of the business arrangement. Payments to customers that are not capitalized are recognized as a reduction to revenue at the time of the commitment to make such payments.

As of December 31, 2025 and 2024, total capitalized payments to customers were $18,168 and $14,276, respectively.

During the years ended December 31, 2025, 2024 and 2023, the Company recognized $1,634, $447 and $179 as reductions of revenue due to amortization and write-off of previously capitalized payments.

The Company has no material contract assets or contract liabilities as of December 31, 2025.

Medical Revenues

Revenues from our patient temperature management business unit are generated from the sale of products and equipment. Our medical products and equipment focus on patient temperature management. The Company sells medical products and equipment

primarily through distributor and group purchasing organization agreements. These agreements allow member participants to the distributor or group purchasing organization to make purchases at discounted prices negotiated by the distributor or group purchasing organization. A rebate is incurred at the point in time a member participant purchases product covered under these types of agreements. Rebates are accounted for as variable consideration, using an expected value, probability weighted approach, based on the level of sales to the distributor and the time lag between the initial sale and the rebate claim in determining the transaction price of a contract. Revenue is recognized when control of the medical products or equipment has transferred to the customer according to the terms of the contract, which typically occurs at the point in time when the parts are either shipped or delivered to the customer’s premises.

Cash and Cash Equivalents

The Company considers all highly liquid investments purchased with original maturities of less than 90 days to be cash equivalents. The Company had cash and cash equivalents of $103,135 and $106,905 held in foreign jurisdictions as of December 31, 2025 and 2024, respectively.

Concentration of Credit Risk

The following is a summary of the percentage of product revenues and accounts receivable from the Company's customers with a percentage of Product Revenues greater than 10 percent:


	Percentage of Total Product Revenues									Percentage of Total Net Accounts Receivable
	Year Ended December 31,									Year Ended December 31,
	2025			2024			2023			2025			2024
Lear		16	%		16	%		15	%		17	%		16	%
Adient		11	%		11	%		13	%		11	%		11	%

Accounts Receivable

Accounts receivable are stated at the invoiced amount, less allowance for doubtful accounts for estimated amounts not expected to be collected, and do not bear interest.

The Company establishes and maintains allowances for the inability or unwillingness of customers to make required payments on their accounts receivable balances. These allowances reflect management's estimate of credit losses over the remaining expected life of such assets, measured primarily using historical write-off experience by industry and regional economic data, as well as current conditions and forecasts that affect the collectability of the reported amount. We write-off accounts receivable when they become uncollectible. As of December 31, 2025 and 2024, the Company’s accounts receivable are reflected net of reserves of $1,600 and $1,605, respectively. Changes in the allowance for doubtful accounts were not significant during the years ended December 31, 2025 and 2024.

In the Asia-Pacific region, the Company receives bank notes from certain customers to settle trade receivables. The collection of such bank notes is included in operating cash flows based on the substance of the underlying transactions, which are operating in nature. Bank notes held by the Company are classified as notes receivable within other current assets. The Company may hold such bank notes until maturity, exchange them with suppliers to settle liabilities, or sell them to third-party financial institutions in exchange for cash.

Inventory

The Company’s inventory is measured at the lower of cost or net realizable value. Raw materials, components and consumables are measured using the weighted average cost method. Work-in-process and finished goods are measured using the first-in first-out

method. If the net realizable value expected on the reporting date is below cost, a write-down is recorded to adjust inventory to its net realizable value. We recognize a reserve for obsolete and slow-moving inventories based on estimates of future sales and an inventory item’s capacity to be repurposed for a different use. We consider the number of months' supply on hand based on current planned requirements, uncommitted future projections and historical usage in estimating the inventory reserve.

Property and Equipment

Property and equipment is recorded at cost less accumulated depreciation. Expenditures for general repairs and maintenance are charged to expense as incurred. When property or equipment is retired or otherwise disposed of, the related cost and accumulated depreciation are removed from the accounts. Gains or losses from retirements and disposals are recorded as operating income or expense.

Depreciation is computed using the straight-line method. The estimated useful lives of the Company’s property and equipment are as follows:


Asset Category		Useful Life
Buildings and improvements		1 to 30 years
Machinery and equipment		10 years
Production tooling		2 to 10 years
Leasehold improvements		Term of lease
Information technology		1 to 5 years

The Company recognized depreciation expense of $45,792, $45,503 and $42,186 for the years ended December 31, 2025, 2024 and 2023, respectively.

Tooling

The Company incurs costs related to tooling used in the manufacture of products sold to its customers. In some cases, the Company enters into contracts with its customers whereby the Company incurs the costs to design, develop and purchase tooling and is then reimbursed by the customer under a reimbursement contract. Tooling costs that will be reimbursed by customers are included in other current assets in the accompanying consolidated balance sheets at the lower of accumulated cost or the customer reimbursable amount. As of December 31, 2025 and 2024, the Company had $23,553 and $19,740, respectively, of reimbursable tooling costs capitalized. Company-owned tooling is included in property and equipment and depreciated over its expected useful life, generally two to ten years.

Goodwill and Other Intangible Assets

Goodwill and other intangible assets recorded in conjunction with business combinations are based on the Company’s estimate of fair value, as of the date of acquisition.

Amortization of other intangible assets is computed using the straight-line method. The useful lives for acquired intangible assets are listed below as follows:


Asset Category		Useful Life
Customer relationships		8 to 15 years
Technology		5 to 12 years
Product development costs		5 to 10 years
Trade names		Indefinite
Software development costs		4 to 5 years

Our business strategy largely centers on designing products based upon internally developed and purchased technology, and we protect certain technology with patents that have value to our business strategy. All costs associated with the development and

issuance of new patents are expensed as incurred. Such costs are classified as net research and development expenses in the accompanying consolidated statements of income.

Valuation of long-lived assets

Valuation of Long-lived Assets

The carrying value of long-lived assets held for use, including definite-lived intangible assets, is periodically evaluated when events or circumstances warrant such a review. The carrying value of a long-lived asset held for use is considered impaired when the anticipated separately identifiable undiscounted cash flows from the asset are less than the carrying value of the asset. In that event, a loss is recognized based on the amount by which the carrying value exceeds the estimated fair value of the long-lived asset. Impairment losses on long-lived assets held for sale are recognized if the carrying value of the asset is in excess of the asset’s estimated fair value, reduced for the cost to dispose of the asset.

Impairments of Other Intangible Assets and Goodwill

Goodwill is tested for impairment at least annually as of December 31 and whenever events or changes in circumstances indicate that the carrying value may not be recoverable. In conducting our annual impairment assessment testing, we first perform a qualitative assessment of whether it is more likely than not that a reporting unit’s fair value is less than its carrying amount. If not, no further goodwill impairment testing is performed. If it is more likely than not that a reporting unit’s fair value is less than its carrying amount, or if we elect not to perform a qualitative assessment of a reporting unit, we then compare the fair value of the reporting unit to the related net book value. If the net book value of a reporting unit exceeds its fair value, an impairment loss is measured and recognized.

The Company utilizes an income approach to estimate the fair value of a reporting unit and a market valuation approach to further support this analysis (level 3). The income approach is based on projected debt-free cash flow that is discounted to the present value using discount factors that consider the timing and risk of cash flows. We believe that this approach is appropriate because it provides a fair value estimate based on the reporting unit’s expected long-term operating cash flow performance. This approach also mitigates the impact of cyclical trends that occur in our industry. Fair value is estimated using internally developed forecasts, as well as commercial and discount rate assumptions. The discount rate used is the value-weighted average of our estimated cost of equity and of debt (“cost of capital”) derived using both known and estimated customary market metrics. Our weighted average cost of capital is adjusted to reflect risk, if necessary. Other significant assumptions include terminal value growth rates and terminal value margin rates. While there are inherent uncertainties related to the assumptions used and to management’s application of these assumptions to this analysis, we believe that the income approach provides a reasonable estimate of the fair value of a reporting unit.

In addition to annual impairment testing, which is performed in the fourth quarter of each fiscal year, the Company continuously monitors for events and circumstances that could negatively impact the key assumptions used in determining fair value and therefore would require interim impairment testing, including long-term revenue growth projections, profitability, discount rates, recent market valuations from transactions by comparable companies, volatility in the Company's market capitalization, and general industry, market and macroeconomic conditions

The Company performs its indefinite-lived intangible asset impairment assessment annually as of December 31, and between annual assessments if an event occurs or circumstances change that would more likely than not reduce the fair value of the asset below its carrying value.

See Note 6, "Goodwill and Other Intangibles," for additional information about the asset impairment analyses.

Investments in Non-Consolidated Affiliates

Investments in Non-consolidated Affiliates

In December 2021, the Company committed to make a $5,000 investment in Autotech Fund III, L.P. (“Autotech”), pursuant to a limited partnership agreement. Autotech focuses broadly on the automotive industry and complements the Company’s innovation strategy. As a limited partner, the Company will periodically make capital contributions toward its total commitment amount over the

expected ten-year life of the fund. The Company has made contributions totaling approximately $2,855 as of December 31, 2025. Our investment is accounted for under the equity method. In the years ended December 31, 2025, 2024 and 2023 we recognized $303, $0 and ($104) in other (loss) income. The carrying value was $2,933 and $1,540 as of December 31, 2025 and 2024, respectively.

In addition to Autotech, the Company’s Automotive segment has ownership interests in two non-consolidated affiliates that are measured at cost, less impairments, adjusted for observable price changes in orderly transactions for identical or similar investments of the same issuer. As a result of observable transactions and impairment indicators during the years ended December 31, 2025, 2024 and 2023, the Company recognized ($4,941), $1,097 and ($2,900), respectively in other (loss) income. The carrying value of these investments was $1,463 and $6,254 as of December 31, 2025 and 2024, respectively.

Research and Development Expenses

Research and development activities are expensed as incurred. Such costs and related reimbursements are classified as net research and development expenses in the accompanying consolidated statements of income.

Leases

The Company determines whether a contractual arrangement is or contains a lease at contract inception. A lease liability and corresponding right-of-use asset are measured and recognized based on the present value of lease payments. To determine the present value of lease payments, the Company uses its incremental borrowing rate as of the lease commencement date, unless there is a rate implicit in the lease agreement. The incremental borrowing rate is based on the Company’s credit rating, determined on a fully collateralized loan basis from information available at commencement date, and the duration of the lease term (the “reference rate”). For leases at foreign subsidiaries denominated in U.S. dollars, a risk premium associated with the borrower subsidiary’s country is added to the reference rate. For significant leases at foreign subsidiaries denominated in a foreign currency, the U.S. dollar risk free rate with a duration similar to that of the lease term is subtracted from the reference rate and a corresponding foreign currency risk free rate with a duration similar to that of the lease term is added to the reference rate.

Operating lease assets are included in operating lease right-of-use assets and the related liabilities are included in current lease liabilities and non-current lease liabilities in the accompanying consolidated balance sheets. Assets under finance leases are included in property and equipment, net, and the related liabilities are included in current maturities of long-term debt, and long-term debt on the Company’s consolidated balance sheets.

For all classes of underlying assets, the Company accounts for leases that contain separate lease and non-lease components as containing a single lease component. The Company does not recognize lease right-of-use assets and lease liabilities from leases with an original lease term of 12 months or less and, instead, recognizes rent payments on a straight-line basis over the lease term in the consolidated statements of income.

Income Taxes

The Company records income tax expense using the liability method which specifies that deferred tax assets and liabilities be measured each year based on the difference between the financial statement and tax base of assets and liabilities at the applicable enacted tax rates. A valuation allowance is provided for deferred tax assets when management considers it more likely than not that the asset will not be realized. At December 31, 2025 and 2024, a valuation allowance has been provided for certain deferred tax assets which the Company has concluded are more likely than not to not be realized. If future annual taxable income were to be significantly less than current and projected levels, there is a risk that certain of our deferred tax assets not already provided for by the valuation allowance would expire prior to utilization.

The Company recognizes the financial statement benefit of a tax position only after determining that the relevant tax authority would more likely than not sustain the position following an audit. For tax positions meeting the more-likely-than-not threshold, the amount recognized in the financial statements is the largest benefit that has a greater than 50 percent likelihood of being realized upon

ultimate settlement with the relevant tax authority. The Company recognizes interest and penalties related to income tax matters in income tax expense.

Derivative Financial Instruments - Hedge Accounting

Derivative Financial Instruments – Hedge Accounting

All derivative instruments are required to be reported on the balance sheet at fair value unless the transactions qualify and are designated as normal purchases or sales. Changes in fair value are reported currently through earnings unless they meet hedge accounting criteria. The Company’s designated hedging relationships are formally documented at the inception of the hedge, and hedges must be highly effective in offsetting changes to future cash flows on hedged transactions both at the inception of a hedge and on an ongoing basis to be designated for hedge accounting treatment.

The Company accounts for its designated derivative financial instruments as cash flow hedges. For derivative contracts which are designated as a cash flow hedge, the effective portion of the change in the fair value of the derivative contract is recorded to accumulated other comprehensive loss (“AOCI”) in the accompanying consolidated balance sheets. When the underlying hedge transaction is realized, the gain or loss included in AOCI is recorded into earnings in the consolidated statements of income on the same line as the hedged item. Also, the Company records the ineffective portion, if any, on the same line as the hedged item. These hedging transactions and the respective correlations meet the requirements for hedge accounting.

Exposure to fluctuations in interest rates and certain commodity prices are managed by entering into swaps with various counterparties. The Company does not enter into derivative transactions for speculative or trading purposes. As part of the hedging program approval process, Gentherm identifies the specific financial risk which the derivative transaction will minimize, the appropriate hedging instrument to be used to reduce the risk and the correlation between the financial risk and the hedging instrument. Hedge positions, as well as the correlation between the transaction risks and the hedging instruments, are reviewed on an ongoing basis.

Earnings Per Share

Earnings per Share

Basic earnings per share is computed by dividing net income by the weighted average number of shares of the Company's common stock, no par value ("Common Stock") outstanding during the respective period. The Company’s diluted earnings per share give effect to all potential shares of Common Stock outstanding during a period that do not have an anti-dilutive impact to the calculation. In computing the number of diluted shares outstanding, the treasury stock method is used in order to arrive at a net number of shares created upon the conversion of Common Stock equivalents.

Stock Based Compensation

Stock based payments that involve the issuance of Common Stock to employees, including grants of employee stock options, restricted stock, and time-based and performance-based restricted stock units, are recognized in the consolidated financial statements as compensation expense based upon the fair value on the date of grant.

Stock based payments that are satisfied only by the payment of cash, such as stock appreciation rights, are accounted for as liabilities. The liability is reported at market value of the vested portion of the underlying units. During each period, the change in the liability is recorded as compensation expense.

Recently Adopted Accounting Pronouncements

Income Taxes

In December 2023, the FASB issued ASU 2023-09, "Income Taxes (Topic 740): Improvements to Income Tax Disclosures". ASU 2023-09 enhances income tax disclosures to further disaggregate the effective tax rate reconciliation and income taxes paid. This update is effective for fiscal years beginning after December 15, 2024. ASU 2023-09 should be adopted prospectively, but retrospective application is permitted. The Company adopted ASU 2023-09 as of December 31, 2025 using a prospective approach. See Note 18 "Income Taxes" for the disclosures related to the adoption of 2023-09.

Recently Issued Accounting Pronouncements Not Yet Adopted

Disaggregation of Income Statement Expenses

In November 2024, the FASB issued ASU 2024-03, "Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40) ". ASU 2024-03 enhances disclosures around certain costs and expenses. Retrospective adoption is required for all periods presented in the financial statements and early adoption is permitted. This update is effective for annual reporting periods beginning after December 15, 2026, and interim periods beginning after December 15, 2027. We are currently in the process of determining the impact the implementation of ASU 2024-03 will have on the Company’s financial statement disclosures.

Internal-Use Software

In September 2025, the FASB issued ASU 2025-06, "Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40)". ASU 2025-06 modernizes the accounting for internal-use software costs. Retrospective, prospective, or a modified transition approach for adoption are all permitted, as well as early adoption at the beginning of an annual reporting period. This update is effective for annual reporting periods beginning after December 15, 2027, and interim reporting periods within those annual reporting periods. We are currently in the process of determining the impact the implementation of ASU 2025-06 will have on the Company’s financial statement disclosures.

Acquisitions - Summary of Product Revenues and Operating Income (Detail) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2025

Dec. 31, 2024

Dec. 31, 2023

Business Combination [Line Items]

Product revenues

$ 1,498,602

$ 1,456,124

^[1]

$ 1,469,076

Type of Revenue [Extensible List]

us-gaap:ProductMember

Operating income (loss)

$ 82,700

$ 107,015

$ 77,439

[1]

Product categories have been modified, and prior-period amounts have been recast to conform with the current period presentation. Climate Control Seats (CCS) includes CCS Heat (previously Seat Heaters), CCS Vent/CCS Active (previously CCS) and CCS Neck Conditioners (previously included in Other Automotive). Climate Control Interiors (CCI) includes CCI Steering Wheel Heat and CCI Interior Heat (previously included in Other Automotive). Other Automotive includes Automotive Cables, Battery Performance Solutions, non-automotive electronics and contract manufacturing electronics (previously classified as Electronics).

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482573/350-20-50-4

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479328/805-10-50-8

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 47
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479303/805-10-55-47

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-5

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (f)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479581/805-30-50-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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The net result for the period of deducting operating expenses from operating revenues.

+ References

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details

Financial Instruments - Summary of Trade Receivables Sold and Factoring Fees Incurred (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Trade receivables sold	$ 98,761
Factoring fees incurred	$ 615

Reclassifications Out of Accumulated Other Comprehensive Loss (Tables)

12 Months Ended

Dec. 31, 2024

Equity [Abstract]

Schedule of Reclassification Adjustments and Other Activities Impacting Accumulated Other Comprehensive Loss

Reclassification adjustments and other activities impacting accumulated other comprehensive loss during the years ended December 31, 2025, 2024 and 2023 are as follows:


	Defined Benefit Pension Plans			Foreign Currency Translation Adjustments			Cash Flow Hedge Derivatives				Total
Balance at December 31, 2024	$	(1,851	)	$	(80,096	)	$	(3,246	)		$	(85,193	)
Other comprehensive income before reclassifications		103			77,982			12,793				90,878
Income tax effect of other comprehensive income before reclassifications		(30	)		—			(2,641	)			(2,671	)
Amounts reclassified from accumulated other comprehensive loss into net income		78			—			(5,062	)	a		(4,984	)
Income taxes reclassified into net income		(21	)		—			1,027				1,006
Net current period other comprehensive income (loss)		130			77,982			6,117				84,229
Balance at December 31, 2025	$	(1,721	)	$	(2,114	)	$	2,871			$	(964	)

(a)

The amounts reclassified from accumulated other comprehensive loss of $4,830 and $232 are included in cost of sales and interest expense, net, respectively, in the consolidated statements of income. Refer to Note 13, "Financial Instruments," for additional information.


	Defined Benefit Pension Plans			Foreign Currency Translation Adjustments			Cash Flow Hedge Derivatives				Total
Balance at December 31, 2023	$	(1,011	)	$	(34,830	)	$	5,681			$	(30,160	)
Other comprehensive (loss) income before reclassifications		(1,242	)		(45,519	)		(3,648	)			(50,409	)
Income tax effect of other comprehensive (loss) income before reclassifications		335			253			784				1,372
Amounts reclassified from accumulated other comprehensive loss into net income		91			—			(7,611	)	a		(7,520	)
Income taxes reclassified into net income		(24	)		—			1,548				1,524
Net current period other comprehensive (loss) income		(840	)		(45,266	)		(8,927	)			(55,033	)
Balance at December 31, 2024	$	(1,851	)	$	(80,096	)	$	(3,246	)		$	(85,193	)

(a)

The amounts reclassified from accumulated other comprehensive loss are included in cost of sales in the consolidated statements of income. Refer to Note 13, "Financial Instruments," for additional information.


	Defined Benefit Pension Plans			Foreign Currency Translation Adjustments			Cash Flow Hedge Derivatives				Total
Balance at December 31, 2022	$	(1,067	)	$	(48,269	)	$	2,847			$	(46,489	)
Other comprehensive income before reclassifications		54			13,125			13,086				26,265
Income tax effect of other comprehensive income before reclassifications		(15	)		314			(2,770	)			(2,471	)
Amounts reclassified from accumulated other comprehensive loss into net income		23			—			(9,603	)	a		(9,580	)
Income taxes reclassified into net income		(6	)		—			2,121				2,115
Net current period other comprehensive income		56			13,439			2,834				16,329
Balance at December 31, 2023	$	(1,011	)	$	(34,830	)	$	5,681			$	(30,160	)

(a)

The amounts reclassified from accumulated other comprehensive loss are included in cost of sales. Refer to Note 13, "Financial Instruments," for additional information.

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 18,285	$ 64,947	$ 40,343
Other comprehensive income (loss):
Pension benefit obligations, net of tax	130	(840)	56
Foreign currency translation adjustments, net of tax	77,982	(45,266)	13,439
Unrealized gain (loss) on foreign currency derivative securities, net of tax	6,117	(8,927)	2,834
Other comprehensive income (loss), net of tax	84,229	(55,033)	16,329
Comprehensive income	$ 102,514	$ 9,914	$ 56,672

- Definition

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.

+ References + Details

- Definition

Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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+ Details

New Accounting Pronouncements	12 Months Ended
New Accounting Pronouncements	Dec. 31, 2025
Accounting Standards Update and Change in Accounting Principle [Abstract]
New Accounting Pronouncements	Note 3 — New Accounting Pronouncements Recently Adopted Accounting Pronouncements Income Taxes In December 2023, the FASB issued ASU 2023-09, "Income Taxes (Topic 740): Improvements to Income Tax Disclosures". ASU 2023-09 enhances income tax disclosures to further disaggregate the effective tax rate reconciliation and income taxes paid. This update is effective for fiscal years beginning after December 15, 2024. ASU 2023-09 should be adopted prospectively, but retrospective application is permitted. The Company adopted ASU 2023-09 as of December 31, 2025 using a prospective approach. See Note 18 "Income Taxes" for the disclosures related to the adoption of 2023-09. Recently Issued Accounting Pronouncements Not Yet Adopted Disaggregation of Income Statement Expenses In November 2024, the FASB issued ASU 2024-03, "Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40) ". ASU 2024-03 enhances disclosures around certain costs and expenses. Retrospective adoption is required for all periods presented in the financial statements and early adoption is permitted. This update is effective for annual reporting periods beginning after December 15, 2026, and interim periods beginning after December 15, 2027. We are currently in the process of determining the impact the implementation of ASU 2024-03 will have on the Company’s financial statement disclosures. Internal-Use Software In September 2025, the FASB issued ASU 2025-06, "Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40)". ASU 2025-06 modernizes the accounting for internal-use software costs. Retrospective, prospective, or a modified transition approach for adoption are all permitted, as well as early adoption at the beginning of an annual reporting period. This update is effective for annual reporting periods beginning after December 15, 2027, and interim reporting periods within those annual reporting periods. We are currently in the process of determining the impact the implementation of ASU 2025-06 will have on the Company’s financial statement disclosures.

Summary of Significant Accounting Policies - Estimated Useful Lives of Property and Equipment (Detail)	Dec. 31, 2025
Plant and Equipment
Property Plant And Equipment [Line Items]
Property plant and equipment, estimated useful life	10 years
Leasehold Improvements
Property Plant And Equipment [Line Items]
Leasehold improvements	us-gaap:UsefulLifeTermOfLeaseMember
Minimum \| Buildings and Improvements
Property Plant And Equipment [Line Items]
Property plant and equipment, estimated useful life	1 year
Minimum \| Production Tooling
Property Plant And Equipment [Line Items]
Property plant and equipment, estimated useful life	2 years
Minimum \| Information Technology
Property Plant And Equipment [Line Items]
Property plant and equipment, estimated useful life	1 year
Maximum \| Buildings and Improvements
Property Plant And Equipment [Line Items]
Property plant and equipment, estimated useful life	30 years
Maximum \| Production Tooling
Property Plant And Equipment [Line Items]
Property plant and equipment, estimated useful life	10 years
Maximum \| Information Technology
Property Plant And Equipment [Line Items]
Property plant and equipment, estimated useful life	5 years

Equity - Schedule of Share Repurchases and Related Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share Repurchase Program [Line Items]
Total	$ 10,015	$ 51,585	$ 91,094
2024 Stock Repurchase Program
Share Repurchase Program [Line Items]
Total number of shares repurchased	381,600	1,019,314
Average price paid per share	$ 26.24	$ 49.22
Total	$ 10,015	$ 50,169
Excise tax charged	$ 100	$ 502

- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References + Details

Income Taxes - Reconciliations Between Statutory Federal Income Tax Rate and Effective Rate (Detail) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2025

Dec. 31, 2024

Dec. 31, 2023

Effective Income Tax Rate Reconciliation [Line Items]

Pre-tax book income

$ 35,835

$ 102,265

$ 54,954

U.S. Federal statutory rate

7,525

State and local income taxes (net of Federal benefit)

^[1]

(52)

Other

527

Effect of changes in tax laws or rates enacted in the current period

Global Intangible Low-Taxed Income (GILTI)

6,998

Subpart F Income

(401)

Foreign Currency Gain

969

Tax credits - R&D

(1,430)

Changes in valuation allowances

830

Stock Options / Executive Compensation

2,505

Transaction Costs

1,257

Changes in unrecognized tax benefits

178

Effective tax rate

$ 17,550

$ 37,318

$ 14,611

U.S. Federal statutory rate, Percent of Pre-tax Income

21.00%

State and local income taxes (net of Federal benefit), Percent of Pre-tax Income

^[1]

(0.20%)

Statutory tax rate difference, Percent of Pre-tax Income

(0.70%)

0.90%

Other, Percent of Pre-tax Income

1.40%

(2.90%)

0.20%

Effect of changes in tax laws or rates enacted in the current period, Percent of Pre-tax Income

0.00%

Global Intangible Low-Taxed Income (GILTI), Percent of Pre-tax Income

19.50%

Subpart F Income, Percent of Pre-tax Income

(1.10%)

Foregin Currency Gain, Percent of Pre-tax Income

2.70%

Tax credits - R&D, Percent of Pre-tax Income

(4.00%)

(3.70%)

(8.50%)

Changes in valuation allowances, Percent of Pre-tax Income

2.30%

(9.00%)

(3.10%)

Non-taxable / non-deductible items, Percent of Pre-tax Income

15.70%

6.80%

Stock Options / Executive Compensation, Percent of Pre-tax Income

7.00%

Transaction Costs, Percent of Pre-tax Income

3.50%

Changes in unrecognized tax benefits, Percent of Pre-tax Income

0.50%

Effective rate

49.00%

36.50%

26.60%

Increase (decrease) resulting from:

Change in valuation allowance

2.30%

(9.00%)

(3.10%)

Effect of different tax rates of foreign jurisdictions

(0.70%)

0.90%

Goodwill impairment

4.10%

Non-deductible expenses

15.70%

6.80%

Other foreign, state and local taxes

2.10%

3.50%

Tax impact of foreign income

7.50%

3.60%

Stock Option Compensation

1.00%

Audit settlements and statute expirations

11.00%

Incentive tax rates in foreign jurisdictions

(5.50%)

(1.90%)

Other

1.40%

(2.90%)

0.20%

Effective rate

49.00%

36.50%

26.60%

China

Effective Income Tax Rate Reconciliation [Line Items]

Statutory tax rate difference

$ 2,072

(1,747)

(2,074)

1,650

$ 343

Statutory tax rate difference, Percent of Pre-tax Income

5.80%

Tax rate holiday, Percent of Pre-tax Income

(4.90%)

R&D super deduction, Percent of Pre-tax Income

(5.80%)

Withholding taxes, Percent of Pre-tax Income

4.60%

Other, Percent of Pre-tax Income

1.00%

Increase (decrease) resulting from:

Effect of different tax rates of foreign jurisdictions

5.80%

Other

1.00%

Effective rate

$ 2,072

Germany

Effective Income Tax Rate Reconciliation [Line Items]

Statutory tax rate difference

794

Local Income Taxes

(1,703)

Provision to Return

(1,304)

Tax on Intercompany Distributions

1,891

Other

$ 243

Statutory tax rate difference, Percent of Pre-tax Income

2.20%

Local Income Taxes, Percent of Pre-tax Income

(4.80%)

Provision to Return, Percent of Pre-tax Income

(3.60%)

Other, Percent of Pre-tax Income

0.70%

Tax on Intercompany Distributions, Percent of Pre-tax Income

5.30%

Increase (decrease) resulting from:

Effect of different tax rates of foreign jurisdictions

2.20%

Other

0.70%

Effective rate

$ 794

Hungary

Effective Income Tax Rate Reconciliation [Line Items]

Statutory tax rate difference

(9,434)

Qualified Domestic Minimum Top-up Tax (QDMTT)

3,319

Local Business Tax & Local Innovation Tax

2,244

Other

$ (12)

Statutory tax rate difference, Percent of Pre-tax Income

(26.30%)

Other, Percent of Pre-tax Income

0.00%

Qualified Domestic Minimum Top-up Tax (QDMTT), Percent of Pre-tax Income

9.30%

Local Business Tax & Local Innovation Tax, Percent of Pre-tax Income

6.30%

Increase (decrease) resulting from:

Effect of different tax rates of foreign jurisdictions

(26.30%)

Other

0.00%

Effective rate

$ (9,434)

Korea

Effective Income Tax Rate Reconciliation [Line Items]

Withholding taxes

1,952

Other

$ (290)

Withholding taxes, Percent of Pre-tax Income

5.40%

Other, Percent of Pre-tax Income

(0.80%)

Increase (decrease) resulting from:

Other

(0.80%)

Other Foreign Jurisdictions

Effective Income Tax Rate Reconciliation [Line Items]

Statutory tax rate difference

$ 700

Statutory tax rate difference, Percent of Pre-tax Income

2.00%

Increase (decrease) resulting from:

Effect of different tax rates of foreign jurisdictions

2.00%

Effective rate

$ 700

[1]	State taxes in Texas for 2025 made up the majority (greater than 50%) of the tax effect in this category.

Consolidated Statements of Income - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2025

Dec. 31, 2024

Dec. 31, 2023

Income Statement [Abstract]

Product revenues

$ 1,498,602

$ 1,456,124

^[1]

$ 1,469,076

Type of Revenue [Extensible List]

us-gaap:ProductMember

Cost of sales

$ 1,136,426

$ 1,089,693

$ 1,117,452

Gross margin

362,176

366,431

351,624

Operating expenses:

Net research and development expenses

94,759

88,697

94,358

Selling, general and administrative expenses

170,045

155,108

155,579

Restructuring expenses, net

12,476

13,110

4,739

Loss on sale of land and building, net

2,196

Impairment of intangible assets and property and equipment

2,501

Impairment of goodwill

19,509

Total operating expenses

279,476

259,416

274,185

Operating income

82,700

107,015

77,439

Interest expense, net

(13,811)

(15,300)

(14,641)

Foreign currency (loss) gain

(28,415)

9,599

(5,918)

Other (loss) income

(4,639)

951

(1,926)

Earnings before income tax

35,835

102,265

54,954

Income tax expense

17,550

37,318

14,611

Net income

$ 18,285

$ 64,947

$ 40,343

Basic earnings per share

$ 0.6

$ 2.08

$ 1.23

Diluted earnings per share

$ 0.59

$ 2.06

$ 1.22

Weighted average number of shares – basic

30,585,443

31,293,113

32,778,055

Weighted average number of shares – diluted

30,932,894

31,476,486

33,066,917

[1]

Fair Value Measurement

12 Months Ended

Dec. 31, 2025

Fair Value Disclosures [Abstract]

Fair Value Measurement

Note 14 — Fair Value Measurement

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants on the measurement date. In determining fair value, the Company utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs to the extent possible and also considers counterparty credit risk in its assessment of fair value.

Fair value measurements are classified under the following fair value hierarchy:

Level 1: Quoted prices (unadjusted) in active markets that are accessible at the measurement date for assets or liabilities. The fair value hierarchy gives the highest priority to Level 1 inputs.

Level 2: Inputs, other than quoted market prices included in Level 1, that are observable either directly or indirectly for the asset or liability.

Level 3: Unobservable inputs are used when little or no market data is available. Unobservable inputs are used if there is little or no market data for the asset or liability at the measurement date.

Items Measured at Fair Value on a Recurring Basis

The Company uses an income approach to value derivative instruments, analyzing quoted market prices to calculate the forward values and then discounting such forward values to the present value using benchmark rates at commonly quoted intervals for the instrument’s full term. The Company had no other material financial assets and liabilities that were carried at fair value at December 31, 2025 and 2024.

Items Measured at Fair Value on a Nonrecurring Basis

The Company measures certain assets and liabilities at fair value on a non-recurring basis. During the year ended December 31, 2025, there was a decrease in the fair value of two non-consolidated equity investments totaling $4,941 due to observable transactions (Level 2), which was recorded in other income (loss). As of December 31, 2025 and 2024, there were no other significant assets or liabilities measured at fair value on a non-recurring basis.

Items Not Carried at Fair Value

The Company uses an income valuation technique to measure the fair values of its debt instruments by converting amounts of future cash flows to a single present value amount using rates based on current market expectations (Level 2 inputs). As of December 31, 2025 and 2024, the carrying values of the indebtedness under the Company’s Second Amended and Restated Credit Agreement were not materially different than the estimated fair values because the interest rates on variable rate debt approximated rates currently available to the Company (see Note 8, "Debt").

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Dec. 31, 2025
Trading Arrangements, by Individual
Title	directors or Section 16 officers
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

Subsequent Event - Additional Information (Details) - Subsequent Event $ / shares in Units, $ in Millions	Jan. 29, 2026 USD ($) $ / shares
Bridge Facilities
Subsequent Event [Line Items]
Bridge loan facility	$ 790
SpinCo
Subsequent Event [Line Items]
Ownership interest of common stock	60.00%
Definitive Agreements
Subsequent Event [Line Items]
Definitive agreements	On January 29, 2026, the Company entered into definitive agreements with Modine, Platinum SpinCo Inc., a Delaware corporation and wholly owned subsidiary of Modine (“SpinCo”), and Platinum Gold Merger Sub Inc., a Delaware corporation and a wholly owned subsidiary of the Company (“Merger Sub”), with respect to a Reverse Morris Trust transaction, and pursuant to and subject to the terms and conditions of such definitive agreements, (i) Modine will transfer (or cause to be transferred) and SpinCo will accept and assume (or cause to be accepted and assumed) all of the rights, titles and interests to and under certain assets and liabilities relating to Performance Technologies, (ii) Modine will distribute to its shareholders all of the issued and outstanding shares of common stock, $0.01 par value per share, of SpinCo (“SpinCo Common Stock”) held by Modine by way of a pro rata distribution (the “Spin-Off” and the disposition by Modine of 100% of the SpinCo Common Stock by way of the Spin-Off, the “Distribution”) and (iii) following the Distribution, Merger Sub will be merged with and into SpinCo, with SpinCo as the surviving entity (the “Merger”) and all SpinCo Common Stock will be converted into the right to receive shares of Common Stock, as calculated and subject to adjustment as set forth in the Merger Agreement (as defined below) (collectively, the “Modine Transaction”). The transaction was unanimously approved by the Boards of Directors of both Modine and the Company.
Par value \| $ / shares	$ 0.01
Definitive Agreements \| Modine
Subsequent Event [Line Items]
Cash payment	$ 210
Definitive Agreements \| SpinCo
Subsequent Event [Line Items]
Ownership interest of common stock	100.00%
Definitive Agreements \| Former SpinCo Shareholders
Subsequent Event [Line Items]
Ownership interest of common stock	40.00%

Consolidated Statements of Changes In Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Paid-in Capital	Accumulated Other Comprehensive (Loss) Income	Accumulated Earnings
Beginning Balance at Dec. 31, 2022	$ 672,273	$ 122,658	$ 5,447	$ (46,489)	$ 590,657
Beginning Balance (in shares) at Dec. 31, 2022		33,202,000
Net income	40,343				40,343
Other comprehensive income (loss)	16,329			16,329
Stock compensation, net	9,079	$ 9,147	(68)
Stock compensation, net, shares		129,000
Stock repurchase	(93,302)	$ (81,302)	(5,379)		(6,621)
Stock repurchase (in shares)		(1,789,000)
Ending Balance at Dec. 31, 2023	644,722	$ 50,503		(30,160)	624,379
Ending Balance (in shares) at Dec. 31, 2023		31,542,000
Net income	64,947				64,947
Other comprehensive income (loss)	(55,033)			(55,033)
Stock compensation, net	12,919	$ 14,153	(1,055)		(179)
Stock compensation, net, shares		266,000
Stock repurchase	(50,608)	$ (62,607)	5,345		6,654
Stock repurchase (in shares)		(1,019,000)
Ending Balance at Dec. 31, 2024	$ 616,947	$ 2,049	4,290	(85,193)	695,801
Ending Balance (in shares) at Dec. 31, 2024	30,788,639	30,789,000
Net income	$ 18,285				18,285
Other comprehensive income (loss)	84,229			84,229
Stock compensation, net	10,877	$ 10,877
Stock compensation, net, shares		119,000
Stock repurchase	(10,015)	$ (7,315)	(2,700)
Stock repurchase (in shares)		(382,000)
Ending Balance at Dec. 31, 2025	$ 720,323	$ 5,611	$ 1,590	$ (964)	$ 714,086
Ending Balance (in shares) at Dec. 31, 2025	30,526,231	30,526,000

- Definition

Amount after tax and reclassification adjustments of other comprehensive income (loss).

+ References

+ Details

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

+ Details

- Definition

Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

+ References

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+ Details

Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2025

Earnings Per Share [Abstract]

Earnings per Share and Weighted Average Shares Outstanding Used in Calculating Basic and Diluted Earnings per Share

The following table illustrates earnings per share and the weighted average shares outstanding used in calculating basic and diluted earnings per share:


	Year Ended December 31,
	2025		2024		2023
Net income	$	18,285	$	64,947	$	40,343

Basic weighted average shares of Common Stock outstanding		30,585,443		31,293,113		32,778,055
Dilutive effect of stock options, restricted stock awards and restricted stock units		347,451		183,373		288,862
Diluted weighted average shares of Common Stock outstanding		30,932,894		31,476,486		33,066,917

Basic earnings per share	$	0.60	$	2.08	$	1.23
Diluted earnings per share	$	0.59	$	2.06	$	1.22

Leases - Summary of Future Lease Payments for Non-Cancellable Finance Leases (Detail) $ in Thousands	Dec. 31, 2025 USD ($)
Leases [Abstract]
2026	$ 73
Total	$ 73

Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2025

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

Valuation and Qualifying Accounts

SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS

For the Years Ended December 31, 2025, 2024 and 2023

(In thousands)


Description	Balance at Beginning of Period		Charged to Costs and Expenses			Other Activity			Deductions from Reserves			Balance at End of Period
Allowance for Deferred Income Tax Assets
Year Ended December 31, 2023	$	36,671	$	(1,746	)	$	963		$	—		$	35,888
Year Ended December 31, 2024		35,888		(12,004	)		1,388			—			25,272
Year Ended December 31, 2025		25,272		(11,946	)		(1,960	)		—			11,366

Reserve for Inventory
Year Ended December 31, 2023	$	19,246	$	6,867		$	3,876		$	(1,972	)	$	28,017
Year Ended December 31, 2024		28,017		6,437			(346	)		(13,166	)		20,942
Year Ended December 31, 2025		20,942		6,815			3,749			(14,312	)		17,194

Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Current income tax (benefit) expense:
Federal	$ 1,306	$ (1,181)	$ 3,510
State and local	(18)	679	414
Foreign	38,598	27,240	23,759
Total current income tax expense	39,886	26,738	27,683
Deferred income tax (benefit) expense:
Federal	(10,155)	(7,944)	(7,495)
State and local	2	66	444
Foreign	(12,183)	18,458	(6,021)
Total deferred income tax expense (benefit)	(22,336)	10,580	(13,072)
Total income tax expense	$ 17,550	$ 37,318	$ 14,611

Goodwill and Other Intangibles (Tables)

12 Months Ended

Dec. 31, 2025

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Changes in the Carrying Amount of Goodwill, By Reportable Segment

Changes in the carrying amount of goodwill, by reportable segment, for the years ended December 31, 2025 and 2024 were as follows:


	Automotive			Medical (a)			Total
Balance as of December 31, 2023	$	76,696		$	27,377		$	104,073
Currency translation		(3,942	)		(528	)		(4,470	)
Balance as of December 31, 2024	$	72,754		$	26,849		$	99,603
Currency translation		8,277			1,038			9,315
Balance as of December 31, 2025	$	81,031		$	27,887		$	108,918

(a)

Includes accumulated impairment losses of $19,509.

Summary of Other Intangible Assets and Accumulated Amortization Balances

Other intangible assets and accumulated amortization balances as of December 31, 2025 and 2024 were as follows:


	Gross Carrying Value		Accumulated Amortization			Accumulated Impairment			Net Carrying Value
Definite-lived:
Customer relationships	$	121,316	$	(81,785	)	$	(6,185	)	$	33,346
Technology		48,478		(36,238	)		(27	)		12,213
Product development costs		19,943		(19,774	)		(71	)		98
Software development		1,007		(403	)		—			604
Indefinite-lived:
Trade names		7,065		—			(530	)		6,535
Balance as of December 31, 2025	$	197,809	$	(138,200	)	$	(6,813	)	$	52,796

	Gross Carrying Value		Accumulated Amortization			Accumulated Impairment			Net Carrying Value
Definite-lived:
Customer relationships	$	109,608	$	(67,787	)	$	(5,477	)	$	36,344
Technology		43,458		(29,976	)		(24	)		13,458
Product development costs		18,019		(17,849	)		—			170
Software development		1,007		(201	)		—			806
Indefinite-lived:
Trade names		7,003		—			(530	)		6,473
Balance as of December 31, 2024	$	179,095	$	(115,813	)	$	(6,031	)	$	57,251

Summary of Estimate of Future Amortization of Other Intangible Assets

An estimate of future amortization of other intangible assets, is as follows:


2026	$	6,859
2027		6,771
2028		6,703
2029		5,963
2030		4,947

- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

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+ Details

Accounting for Stock Based Compensation - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	May 18, 2023	Dec. 31, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance based restricted stock units outstanding	40,600	21,296	17,923		13,600
Awards vesting period	1 year 10 months 24 days
Shareholder Return Award Performance Measurement Period	3 years
Deferred tax benefit	$ (1,614)	$ (1,485)	$ (1,794)
Total intrinsic value of options exercised	0	2,071	201
Total fair value of restricted stock vested	$ 1,080	$ 1,021	$ 875
Performance Based Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance based restricted stock units outstanding	493,798	279,841	324,977		320,449
Awards vesting period	1 year 11 months 8 days
Awards vesting condition	Company’s achievement of one of five separate performance metrics: a target return on invested capital ratio (“ROIC”), as defined in the award agreement, for a specified fiscal year; a target three-year cumulative Adjusted EBITDA (“Adjusted EBITDA”), as defined in the award agreement; a target annual and three-year growth in the expansion of Adjusted EBITDA Margin Rate (“Adjusted EBITDA Margin Rate”), as defined in the award agreement (as modified by the Company’s relative total shareholder return); the Company’s relative total shareholder return (“TSR”), as defined in the award agreement, during a specific three-year measurement period; a target relative revenue growth relative to light vehicle production in the Company's relevant markets ("RRG"), as defined in the award agreement, during a specific three-year measurement period (in certain cases, as modified by the Company’s relative total shareholder return); and a target annual and three-year growth in the Company's absolute revenue ("Revenue Growth"), as defined in the award agreement, during a specific three-year measurement period.
Stock option achieving minimum threshold	50.00%
Stock option achieving maximum threshold	200.00%
Percentage of decrease in total payout	25.00%
Percentage of increase in total payout	25.00%
Total intrinsic value of stock units vested	$ 1,833	$ 2,574	$ 2,951
ROIC
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards vesting period	3 years
RSU
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards vesting period	1 year 11 months 1 day
Total intrinsic value of stock units vested	$ 5,042	8,358	4,915
Stock Appreciation Rights (SARs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total intrinsic value of options exercised	$ 0	$ 25	$ 242
Employee and Consultants \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation, requisite service period	2 years
Employee and Consultants \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation, requisite service period	4 years
Director
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share based compensation, requisite service period	1 year
2023 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized for grant	1,830,414
Number of shares authorized for grant				3,730,000

Document and Entity Information - USD ($) $ in Thousands	12 Months Ended
Document and Entity Information - USD ($) $ in Thousands	Dec. 31, 2025	Feb. 13, 2026	Jun. 30, 2025
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2025
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	FY
Trading Symbol	THRM
Entity Registrant Name	GENTHERM INCORPORATED
Entity Central Index Key	0000903129
Entity Current Reporting Status	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Common Stock, Shares Outstanding		30,526,465
Entity Shell Company	false
Entity File Number	0-21810
Entity Tax Identification Number	95-4318554
Entity Address, Address Line One	28875 Cabot Drive
Entity Address, City or Town	Novi
Entity Address, State or Province	MI
Entity Address, Postal Zip Code	48377
City Area Code	248
Local Phone Number	504-0500
Entity Interactive Data Current	Yes
Entity Incorporation, State or Country Code	MI
Security Exchange Name	NASDAQ
Title of 12(b) Security	Common Stock, no par value
Document Transition Report	false
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Public Float			$ 853,967,174
Document Annual Report	true
Auditor Firm Id	42
Auditor Name	ERNST & YOUNG LLP
Auditor Location	Detroit, Michigan
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE Portions of the proxy statement for the 2026 annual meeting of shareholders are incorporated by reference into Part III of this Annual Report to the extent described herein.
Document Financial Statement Error Correction [Flag]	false
Auditor Opinion [Text Block]	Opinion on the Financial Statements We have audited the accompanying consolidated balance sheets of Gentherm Incorporated (the Company) as of December 31, 2025 and 2024, the related consolidated statements of income, comprehensive income, changes in shareholders' equity and cash flows for each of the three years in the period ended December 31, 2025, and the related notes and financial statement schedule listed in the Index at Item 15 (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company at December 31, 2025 and 2024, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2025, in conformity with U.S. generally accepted accounting principles. We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company's internal control over financial reporting as of December 31, 2025, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework), and our report dated February 19, 2026, expressed an unqualified opinion thereon. Opinion on Internal Control Over Financial Reporting We have audited Gentherm Incorporated’s internal control over financial reporting as of December 31, 2025, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) (the COSO criteria). In our opinion, Gentherm Incorporated (the Company) maintained, in all material respects, effective internal control over financial reporting as of December 31, 2025, based on the COSO criteria. We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheets of the Company as of December 31, 2025 and 2024, the related consolidated statements of income, comprehensive income, changes in shareholders' equity and cash flows for each of the three years in the period ended December 31, 2025, and the related notes and financial statement schedule listed in the Index at Item 15 and our report dated February 19, 2026 expressed an unqualified opinion thereon.

Pension and Other Post Retirement Benefit Plans - Reconciliation of Change in Benefit Obligation, Change in Plan Assets and Balance Sheet Classification (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Balance sheet classification:
Pension benefit obligation	$ (3,748)	$ (4,017)
United States
Change in projected benefit obligation:
Balance at beginning of year	2,331	2,602
Interest cost	97	101	$ 115
Paid pension distributions	(342)	(342)
Actuarial loss (gain)	43	(30)
Balance at end of year	2,129	2,331	2,602
Change in plan assets:
Underfunded Status	(2,129)	(2,331)
Balance sheet classification:
Other current liabilities	(342)	(342)
Pension benefit obligation	(1,787)	(1,989)
Accumulated other comprehensive loss (pre-tax):
Actuarial losses	$ 236	$ 194
Discount rate	4.10%	4.85%
German Plan
Change in projected benefit obligation:
Balance at beginning of year	$ 6,281	$ 5,406
Interest cost	226	234	217
Paid pension distributions	(240)	(256)
Actuarial loss (gain)	(181)	1,259
Exchange rate impact	805	(362)
Balance at end of year	6,891	6,281	5,406
Change in plan assets:
Balance at beginning of year	4,005	4,145
Actual return on plan assets	111	104
Exchange rate impact	523	(244)
Balance at end of year	4,639	4,005	$ 4,145
Underfunded Status	(2,252)	(2,276)
Balance sheet classification:
Other current liabilities	(291)	(248)
Pension benefit obligation	(1,961)	(2,028)
Accumulated other comprehensive loss (pre-tax):
Actuarial losses	$ 2,104	$ 2,063
Discount rate	3.86%	3.38%

Restructuring - Summary of Restructuring Expenses, Net by Reportable Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	$ 12,476	$ 13,110	$ 4,739
Operating Segments \| Automotive Segments
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	12,279	12,238	3,187
Operating Segments \| Medical Segments
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	156	20	363
Operating Segments \| Corporate Segments
Restructuring Cost And Reserve [Line Items]
Restructuring expenses	$ 41	$ 852	$ 1,189

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References + Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

Restructuring (Tables)

12 Months Ended

Dec. 31, 2025

Restructuring and Related Activities [Abstract]

Summary of Restructuring Expenses, Net by Reportable Segment

Restructuring expenses, net by reporting segment for the years ended December 31, 2025, 2024 and 2023 was as follows:


	Year Ended December 31,
	2025		2024		2023
Automotive	$	12,279	$	12,238	$	3,187
Medical		156		20		363
Corporate		41		852		1,189
Total	$	12,476	$	13,110	$	4,739

Summary of Restructuring Activity for All Restructuring Initiatives

The following table summarizes restructuring activity for all restructuring initiatives for the years ended December 31, 2025 and 2024:


	Employee Separation Costs			Other Related Costs, net (a)			Total
Balance at December 31, 2023	$	2,150		$	—		$	2,150
Additions, charged to restructuring expenses, net		10,896			2,214			13,110
Cash payments		(9,593	)		(1,333	)		(10,926	)
Non-cash utilization		—			(881	)		(881	)
Currency translation and other		(165	)		—			(165	)
Balance at December 31, 2024	$	3,288		$	—		$	3,288
Additions, charged to restructuring expenses, net		9,312			3,520			12,832
Change in estimate		(356	)		—			(356	)
Cash payments		(5,880	)		(3,382	)		(9,262	)
Non-cash utilization		—			(138	)		(138	)
Currency translation and other		564			—			564
Balance at December 31, 2025	$	6,928		$	—		$	6,928

(a)

Includes gain on sale of the Greenville facility

Restructuring

12 Months Ended

Dec. 31, 2025

Restructuring and Related Activities [Abstract]

Restructuring

Note 4 — Restructuring

The Company continuously monitors market developments, industry trends and changing customer needs and in response, may undertake restructuring actions, as necessary, to execute management’s strategy, streamline operations and optimize the Company’s cost structure. Restructuring actions may include the realignment of existing manufacturing footprint, facility closures, or similar actions, either in the normal course of business or pursuant to significant restructuring programs.

These actions may result in employees receiving voluntary or involuntary employee termination benefits, which are mainly statutory requirements or other contractual agreements. Voluntary termination benefits are accrued when an employee accepts the related offer. Involuntary termination benefits are accrued upon the commitment to a termination plan and when the benefit arrangement is communicated to affected employees, or when liabilities are determined to be probable and estimable, depending on the existence of a substantive plan for severance or termination.

2025 EMEA Plan

In February 2025, the Company committed to a restructuring plan to further optimize the Company’s manufacturing footprint by realigning its manufacturing capacity in Europe (“2025 EMEA Plan”). As a result, the Company will close its facility in Plzeň, Czech Republic and relocate the manufacturing activities into other existing facilities within the region.

The Company expects to incur cash restructuring costs of between $4,000 and $6,000 for employee severance and retention costs and between $2,000 and $3,000 of other transition costs primarily for machinery and equipment move and set up costs. Additionally, we expect to incur capital expenditures of between $1,000 and $2,000. The actions under the 2025 EMEA Plan are expected to be substantially completed by the end of 2026.

During the year ended December 31, 2025, the Company recognized restructuring expense of $3,604, for employee separation costs and $1,178, for other costs.

2025 Asia Plan

In February 2025, the Company committed to an additional restructuring plan to further optimize the Company’s manufacturing footprint by realigning its manufacturing capacity in Asia (“2025 Asia Plan”). As a result, the Company will relocate certain manufacturing activities from its facility in Shanghai, China to its new facility in Tianjin, China.

The Company expects to incur cash restructuring costs of between $2,000 and $3,000 for employee severance and retention costs and $1,000 of other transition costs primarily for machinery and equipment move and set up costs. Additionally, we expect to incur capital expenditures of between $2,000 and $3,000. The actions under the 2025 Asia Plan are expected to be substantially completed in the first half of 2026.

During the year ended December 31, 2025, the Company recognized restructuring expense of $2,270 for employee separation costs and $826, for other costs.

2025 Manufacturing Footprint Plan

In July 2025, the Company committed to an additional restructuring plan to further optimize the Company’s manufacturing footprint by realigning its global manufacturing capacity (“2025 Manufacturing Footprint Plan”). As a result, the Company will relocate certain manufacturing activities between existing locations.

The Company expects to incur cash restructuring costs of between $3,000 and $4,000 for employee severance and retention costs and $1,000 of other transition costs primarily for machinery and equipment move and set up costs. Additionally, we expect to incur capital expenditures of between $1,000 and $2,000. The actions under the 2025 Manufacturing Footprint Plan are expected to be substantially completed by the end of 2027.

During the year ended December 31, 2025, the Company recognized restructuring expense of $2,190, for employee separation costs.

2023 Manufacturing Footprint Rationalization

In September 2023, the Company committed to a restructuring plan (“2023 Plan”) to improve the Company’s manufacturing productivity and rationalize its footprint through the closure and relocation of its former manufacturing facility in Greenville, South Carolina to a new facility in Monterrey, Mexico.

During the years ended December 31, 2025, 2024 and 2023, the Company recognized restructuring expenses of $0, $1,839 and $538, respectively, for employee separation costs and $645, $454 and $159, respectively, for other costs.

The actions under the 2023 Manufacturing Footprint Plan are substantially complete.

Other Restructuring Activities

The Company has undertaken several discrete restructuring actions in an effort to optimize its cost structure.

During the year ended December 31, 2025, the Company’s Automotive segment recognized $1,153 for employee separation costs related to structural cost reductions impacting the Company’s global salaried workforce.

During the year ended December 31, 2025, the Company’s Automotive segment recognized a benefit of $262 for employee separation costs and expense of $872 for other costs primarily related to the relocation of certain manufacturing to best cost locations.

During the years ended December 31, 2024 and 2023, the Company recognized $9,057 and $3,208 for employee separation costs, respectively, and $1,760 and $834 for other costs, respectively. These restructuring expenses were primarily associated with restructuring actions focused on the rotation of our manufacturing footprint to best cost locations and the reduction of global overhead costs.

The Company expects to incur less than $1,000 of additional restructuring costs for the other restructuring actions that have been approved as of December 31, 2025.

Restructuring Expenses, net by Reporting Segment

Restructuring expenses, net by reporting segment for the years ended December 31, 2025, 2024 and 2023 was as follows:


	Year Ended December 31,
	2025		2024		2023
Automotive	$	12,279	$	12,238	$	3,187
Medical		156		20		363
Corporate		41		852		1,189
Total	$	12,476	$	13,110	$	4,739

Restructuring Liability

The following table summarizes restructuring activity for all restructuring initiatives for the years ended December 31, 2025 and 2024:


	Employee Separation Costs			Other Related Costs, net (a)			Total
Balance at December 31, 2023	$	2,150		$	—		$	2,150
Additions, charged to restructuring expenses, net		10,896			2,214			13,110
Cash payments		(9,593	)		(1,333	)		(10,926	)
Non-cash utilization		—			(881	)		(881	)
Currency translation and other		(165	)		—			(165	)
Balance at December 31, 2024	$	3,288		$	—		$	3,288
Additions, charged to restructuring expenses, net		9,312			3,520			12,832
Change in estimate		(356	)		—			(356	)
Cash payments		(5,880	)		(3,382	)		(9,262	)
Non-cash utilization		—			(138	)		(138	)
Currency translation and other		564			—			564
Balance at December 31, 2025	$	6,928		$	—		$	6,928

(a)

Includes gain on sale of the Greenville facility

Exit of Non-Automotive Electronics Business

On December 31, 2022, the Company approved a plan to exit its non-automotive electronics business to strengthen the Company’s core business and focus its resources and equipment with businesses and investments that are more strategic and profitable. The Company had substantially completed the exit of this business as of December 2024.

During the year ended December 31, 2024, the Company recorded a benefit of $4,554 for the sale of previously reserved inventory. This benefit is recorded in product revenues in the accompanying consolidated statements of income.

During the year ended December 31, 2023, the Company recorded non-cash impairment charges of $6,064 for the write down of inventory. This charge is recorded in cost of sales in the accompanying consolidated statements of income.

Commitments and Contingencies

12 Months Ended

Dec. 31, 2025

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Note 10 — Commitments and Contingencies

Legal and Other Contingencies

The Company is subject to various legal actions and claims in the ordinary course of its business, which may include those arising out of breach of contracts, intellectual property rights, environmental matters, regulatory matters and employment-related

matters. The Company establishes accruals for matters which it believes that losses are probable and can be reasonably estimated. Although it is not possible to predict with certainty the outcome of these matters, the Company is of the opinion that the ultimate resolution of these matters outstanding as of December 31, 2025 will not have a material adverse effect on its results of operations or financial position. Product liability and warranty reserves are recorded separately from legal reserves.

Product Liability and Warranty Matters

Our products subject us to warranty claims and, from time to time, product liability claims based on the Company’s products alleged failure to perform as expected or resulting in alleged bodily injury or property damage. If any of our products are or are alleged to be defective, we may be required to participate in a recall or other corrective action involving such products. The Company maintains warranty and product liability insurance coverage at levels based on commercial norms and historical claims experience. Such policies may not cover all costs associated with a claim. The Company can provide no assurances that it will not experience material warranty or product liability claims or liabilities in the future or that it will not incur significant costs to defend such claims.

The Company accrues warranty obligations for products sold based on management estimates of future failure rates and current claim cost experience, with support from the sales, engineering, quality and legal functions. Using historical information available to the Company, including any claims filed by customers, the warranty accrual is adjusted quarterly to reflect management’s estimate of future claims.

On February 14, 2024, the National Highway Traffic Safety Administration announced that Volkswagen Group of America, Inc. (“VW”) is recalling 261,257 vehicles from model years 2015-2020 to remedy an alleged problem with a suction jet pump seal inside the fuel tank system. VW informed Gentherm of its plan to conduct the recall on April 3, 2024. The suction jet pump is a product originally designed and manufactured by Alfmeier, the business Gentherm acquired in August 2022. The Company has not accepted any financial responsibility for the recall and is pursuing discussions with VW to advance its position and resolve this matter. No litigation has been threatened or filed as of the date of this report. If the Company is obligated to indemnify VW for the direct and indirect costs associated with the recall, such costs could be material. The Company's insurance policies are not expected to apply to this recall as the production period for the affected parts is outside of the insurance coverage period. The Company’s purchase agreement of Alfmeier includes indemnification provisions under which the Company believes it would have a claim against the sellers which would cover a portion of the potential costs. Given the uncertainty that exists concerning the resolution of this matter, as of the date of this report, the Company cannot reasonably estimate the amount and timing of possible costs that may be incurred by the Company.

In April 2025, NHTSA announced that VW and Porsche Cars North America, Inc. (“Porsche”) are each recalling vehicles from model years 2022-2023 to remedy a problem with their passenger occupant detection system that is alleged to be affected by the crimp connection of the seat cushion heating mat, which is produced by Gentherm. Total vehicles included in these recall campaigns are 13,508. No litigation has been threatened or filed as of the date of this report and the Company has not accepted any financial responsibility for the recalls. If the Company is obligated to indemnify VW and Porsche for the direct and indirect costs associated with the recall, such costs could be material. Insurance policies, noted above, are expected to apply. Given the uncertainty that exists concerning the resolution of this matter, as of the date of this report, the Company cannot reasonably estimate the amount and timing of possible costs that may be incurred by the Company.

The following is a reconciliation of the changes in accrued warranty costs:


	Year Ended December 31,
	2025			2024
Balance at beginning of year	$	3,507		$	3,945
Warranty claims paid		(9,069	)		(6,382	)
Warranty expense for products shipped during the current period		11,706			5,812
Adjustments to warranty estimates from prior periods		1,486			247
Adjustments due to currency translation		175			(115	)
Balance at end of year	$	7,805		$	3,507

Employees

Approximately 36% of the Company’s workforce are members of industrial trade unions or worker councils and are employed under the terms of various labor agreements.

Details of Certain Financial Statement Components (Detail) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Inventory:
Raw materials, net	$ 128,315	$ 137,511
Work in process, net	35,429	19,059
Finished goods, net	88,958	70,786
Total inventory, net	252,702	227,356
Other current assets:
Income tax and other tax receivable	23,826	20,611
Billable tooling	23,553	19,740
Prepaid expenses	9,214	6,305
Short-term derivative financial instruments	4,521	719
Other	7,728	4,737
Total other current assets	82,332	64,413
Property and equipment:
Machinery and equipment	316,212	260,578
Buildings and improvements	124,900	117,953
Information technology	58,910	45,157
Production tooling	42,500	37,765
Leasehold improvements	26,144	23,262
Construction in progress	23,510	36,846
Total property and equipment	592,176	521,561
Less: accumulated depreciation	(321,562)	(268,591)
Total property and equipment, net	270,614	252,970
Other current liabilities:
Accrued employee liabilities	49,924	42,277
Income tax and other taxes payable	31,172	26,385
Liabilities from discounts and rebates	22,391	20,501
Restructuring	6,928	3,288
Accrued warranty	7,805	3,507	$ 3,945
Short-term derivative financial instruments	775	2,037
Other	15,109	7,829
Total other current liabilities	134,104	105,824
Related Party
Other current assets:
Notes receivable	$ 13,490	11,190
Receivables due from factor		$ 1,111

Segment Reporting - Segment Information about Reported Product Revenues, Depreciation and Amortization and Operating Income (Loss) (Detail) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2025

Dec. 31, 2024

Dec. 31, 2023

Product Revenues

Product revenues

$ 1,498,602

$ 1,456,124

^[1]

$ 1,469,076

Significant Segment Expenses and Operating Performance

Cost of sales

1,136,426

1,089,693

1,117,452

Net research and development expenses

94,759

88,697

94,358

Selling, general and administrative expenses

170,045

155,108

155,579

Restructuring expenses, net

12,476

13,110

4,739

Loss on sale of land and building, net

2,196

Impairment of intangible assets and property and equipment

2,501

Operating income (loss)

82,700

107,015

77,439

Other segment disclosures

Depreciation and amortization

53,379

52,975

50,948

Operating Segments

Product Revenues

Product revenues

1,498,602

1,456,124

1,469,076

Corporate and Other Unallocated Expenses

Significant Segment Expenses and Operating Performance

Other operating expenses

(101,153)

Other segment disclosures

Depreciation and amortization

2,275

1,681

1,449

Automotive Segments

Product Revenues

Product revenues

1,448,826

1,406,278

^[1]

1,422,952

Automotive Segments | Operating Segments

Product Revenues

Product revenues

1,448,826

1,406,278

1,422,952

Significant Segment Expenses and Operating Performance

Cost of sales

1,110,222

1,058,989

1,090,941

Net research and development expenses

73,694

68,787

70,778

Selling, general and administrative expenses

67,040

65,924

72,090

Restructuring expenses, net

12,279

12,238

3,187

Loss on sale of land and building, net

2,196

Operating income (loss)

183,395

200,340

185,956

Other segment disclosures

Depreciation and amortization

47,701

47,752

45,845

Medical Segments | Operating Segments

Product Revenues

Product revenues

49,776

49,846

46,124

Significant Segment Expenses and Operating Performance

Cost of sales

26,204

25,868

24,619

Restructuring expenses, net

156

363

Other operating expenses

23,114

21,836

24,230

Impairment of intangible assets and property and equipment

2,501

19,509

Operating income (loss)

458

(359)

(22,234)

Other segment disclosures

Depreciation and amortization

$ 3,403

$ 3,542

$ 3,654

[1]

Pension and Other Post Retirement Benefit Plans - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
401(k) Plan
Defined Benefit Plan Disclosure [Line Items]
Cost recognized for contributions to defined contribution plan	$ 2,257,000	$ 2,264,000	$ 2,344,000
United States
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected employer contribution in next fiscal year	0
German Plan
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected employer contribution in next fiscal year	$ 0

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 20: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

+ Details

Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Jun. 30, 2024
Class Of Stock [Line Items]
Common Stock, shares authorized	55,000,000	55,000,000
Preferred stock, shares authorized	4,991,000
Common Stock, shares issued	30,526,231	30,788,639
Common Stock, shares outstanding	30,526,231	30,788,639
Preferred stock, shares issued	0
Preferred stock, shares outstanding	0
Cash paid to repurchased shares	$ 10,015	$ 51,585	$ 91,094
2024 Stock Repurchase Program
Class Of Stock [Line Items]
Average price paid per share	$ 26.24	$ 49.22
Cash paid to repurchased shares	$ 10,015	$ 50,169
Initial repurchase, shares	381,600	1,019,314
Remaining authorized repurchase amount	$ 110,103	$ 110,103
Excise tax charged	$ 100	$ 502
Maximum
Class Of Stock [Line Items]
Shares issued	59,991,000
Maximum \| 2024 Stock Repurchase Program
Class Of Stock [Line Items]
Stock repurchase program, authorized to repurchase amount				150,000,000

Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Allowance for Deferred Income Tax Assets
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 25,272	$ 35,888	$ 36,671
Charged to Costs and Expenses	(11,946)	(12,004)	(1,746)
Other Activity	(1,960)	1,388	963
Balance at End of Period	11,366	25,272	35,888
Reserve for Inventory
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	20,942	28,017	19,246
Charged to Costs and Expenses	6,815	6,437	6,867
Other Activity	3,749	(346)	3,876
Deductions from Reserves	(14,312)	(13,166)	(1,972)
Balance at End of Period	$ 17,194	$ 20,942	$ 28,017

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Subsection 09
-Paragraph Column E
-Publisher SEC

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Subsection 09
-Paragraph Column D
-Publisher SEC

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Subsection 09
-Paragraph Column C
-Subparagraph (1)
-Publisher SEC

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Subsection 09
-Paragraph Column C
-Subparagraph (2)
-Publisher SEC

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Subsection 09
-Paragraph Column B
-Publisher SEC

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-5

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09(Column C)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09(Column C)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09(Column B))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09(Column E))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09(Column D))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-4

+ Details

Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2025

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Information related to the recurring fair value measurement of derivative financial instruments in the consolidated balance sheet as of December 31, 2025 is as follows:


				Asset Derivatives			Liability Derivatives
	Fair Value Hierarchy	Notional Amount		Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value		Net Asset/ (Liabilities)
Derivatives Designated as Cash Flow Hedges
Foreign currency derivatives	Level 2	$	35,122	Other current assets	$	4,521	Other current liabilities	$	—	$	4,521
Interest rate contracts	Level 2	$	100,000	Other current assets	$	—	Other current liabilities	$	775	$	(775	)

Information related to the recurring fair value measurement of derivative financial instruments in the consolidated balance sheet as of December 31, 2024 is as follows:


				Asset Derivatives			Liability Derivatives
	Fair Value Hierarchy	Notional Amount		Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value		Net Asset/ (Liabilities)
Derivatives Designated as Cash Flow Hedges
Foreign currency derivatives	Level 2	$	126,496	Other current assets	$	—	Other current liabilities	$	2,037	$	(2,037	)
Derivatives Not Designated as Hedging Instruments
Interest rate contracts	Level 2	$	100,000	Other current assets	$	719	Other current liabilities	$	—	$	719

Information related to the effect of derivative instruments in the consolidated statements of income is as follows:


		Year Ended December 31,
	Location	2025			2024			2023
Derivatives Designated as Cash Flow Hedges
Foreign currency derivatives	Cost of sales – income	$	2,883		$	3,717		$	8,630
	Other comprehensive income (loss)		8,505			(11,259	)		3,483
Total foreign currency derivatives		$	11,388		$	(7,542	)	$	12,113

Interest rate contracts	Interest expense, net	$	232		$	—		$	—
	Other comprehensive income (loss)		(775	)		—			—
Total interest rate derivatives		$	(543	)	$	—		$	—

Derivatives Not Designated as Hedging Instruments
Interest rate contracts	Interest expense, net	$	(719	)	$	(1,343	)	$	(710	)
Total interest rate derivatives		$	(719	)	$	(1,343	)	$	(710	)

Summary of Receivables Factored and Availability Under Receivables Factoring Agreements

Receivables factored under receivables factoring agreements balance as of December 31, 2024 were as follows:


	December 31, 2024
Receivables factored and outstanding	$	755

Summary of Trade Receivables Sold and Factoring Fees Incurred

Trade receivables sold and factoring fees incurred during the year ended December 31, 2024 were as follows:


	Year ended December 31, 2024
Trade receivables sold	$	98,761
Factoring fees incurred		615

Subsequent Event

12 Months Ended

Dec. 31, 2025

Subsequent Events [Abstract]

Subsequent Event

Note 20 — Subsequent Event

On January 29, 2026, the Company entered into definitive agreements with Modine, Platinum SpinCo Inc., a Delaware corporation and wholly owned subsidiary of Modine (“SpinCo”), and Platinum Gold Merger Sub Inc., a Delaware corporation and a wholly owned subsidiary of the Company (“Merger Sub”), with respect to a Reverse Morris Trust transaction, and pursuant to and subject to the terms and conditions of such definitive agreements, (i) Modine will transfer (or cause to be transferred) and SpinCo will accept and assume (or cause to be accepted and assumed) all of the rights, titles and interests to and under certain assets and liabilities relating to Performance Technologies, (ii) Modine will distribute to its shareholders all of the issued and outstanding shares of common stock, $0.01 par value per share, of SpinCo (“SpinCo Common Stock”) held by Modine by way of a pro rata distribution (the “Spin-Off” and the disposition by Modine of 100% of the SpinCo Common Stock by way of the Spin-Off, the “Distribution”) and (iii) following the Distribution, Merger Sub will be merged with and into SpinCo, with SpinCo as the surviving entity (the “Merger”) and all SpinCo Common Stock will be converted into the right to receive shares of Common Stock, as calculated and subject to adjustment as set forth in the Merger Agreement (as defined below) (collectively, the “Modine Transaction”). The transaction was unanimously approved by the Boards of Directors of both Modine and the Company.

Upon completion of the Merger, SpinCo will become a wholly owned subsidiary of the Company. In addition, shareholders of the Company immediately prior to the Merger will own approximately 60.0% and former SpinCo shareholders as of the Distribution will own approximately 40.0% of the outstanding shares of Common Stock on a fully diluted basis.

The definitive agreements entered into in connection with the Modine Transaction include (i) an Agreement and Plan of Merger (the “Merger Agreement”), dated as of January 29, 2026, by and among Modine, the Company, SpinCo and Merger Sub, including the forms of specified ancillary agreements to be entered into as of closing, and (ii) a Separation Agreement, dated as of January 29, 2026, by and among Modine, the Company and SpinCo.

Prior to and as a condition of, the Distribution, SpinCo will make a cash payment to Modine of $210 million (the “SpinCo Cash Distribution”), subject to adjustment for cash, working capital and indebtedness of SpinCo and subject to decrease if additional shares of Common Stock will be issued to Modine shareholders to support the intended tax-free treatment of the Distribution to Modine shareholders for U.S. federal income tax purposes.

On January 29, 2026, SpinCo and the Company executed a 364-day bridge loan facility commitment letter with a financial institution, pursuant to which such financial institution committed to provide $790 million in aggregate (collectively, the “Bridge Facilities”) to SpinCo and the Company. The commitment letter provides funding for the SpinCo Cash Distribution. The commitment

letter also provides funding to the Company to backstop capacity under the Revolving Credit Facility while the Company seeks lender consent for the Modine Transaction, to pay a special dividend to the Company’s shareholders, if necessary to support the intended tax-free treatment of the Distribution to Modine shareholders, and to pay fees and expenses of the Modine Transaction. The Bridge Facility is expected to be replaced with permanent financing. If the Modine Transaction is consummated, any indebtedness incurred by SpinCo under the Bridge Facility or the permanent financing will become indebtedness of a wholly owned subsidiary of the Company.

The Modine Transaction is expected to close in the fourth quarter of 2026, subject to various closing conditions, including specified approvals by the Company’s shareholders, completion of financing for SpinCo, a customary IRS tax ruling, receipt of required regulatory approvals and the satisfaction of other customary closing conditions.

Reclassifications Out of Accumulated Other Comprehensive Loss

12 Months Ended

Dec. 31, 2025

Equity [Abstract]

Reclassifications Out of Accumulated Other Comprehensive Loss

Note 16 – Reclassifications Out of Accumulated Other Comprehensive Loss

Reclassification adjustments and other activities impacting accumulated other comprehensive loss during the years ended December 31, 2025, 2024 and 2023 are as follows:


	Defined Benefit Pension Plans			Foreign Currency Translation Adjustments			Cash Flow Hedge Derivatives				Total
Balance at December 31, 2024	$	(1,851	)	$	(80,096	)	$	(3,246	)		$	(85,193	)
Other comprehensive income before reclassifications		103			77,982			12,793				90,878
Income tax effect of other comprehensive income before reclassifications		(30	)		—			(2,641	)			(2,671	)
Amounts reclassified from accumulated other comprehensive loss into net income		78			—			(5,062	)	a		(4,984	)
Income taxes reclassified into net income		(21	)		—			1,027				1,006
Net current period other comprehensive income (loss)		130			77,982			6,117				84,229
Balance at December 31, 2025	$	(1,721	)	$	(2,114	)	$	2,871			$	(964	)

(a)


	Defined Benefit Pension Plans			Foreign Currency Translation Adjustments			Cash Flow Hedge Derivatives				Total
Balance at December 31, 2023	$	(1,011	)	$	(34,830	)	$	5,681			$	(30,160	)
Other comprehensive (loss) income before reclassifications		(1,242	)		(45,519	)		(3,648	)			(50,409	)
Income tax effect of other comprehensive (loss) income before reclassifications		335			253			784				1,372
Amounts reclassified from accumulated other comprehensive loss into net income		91			—			(7,611	)	a		(7,520	)
Income taxes reclassified into net income		(24	)		—			1,548				1,524
Net current period other comprehensive (loss) income		(840	)		(45,266	)		(8,927	)			(55,033	)
Balance at December 31, 2024	$	(1,851	)	$	(80,096	)	$	(3,246	)		$	(85,193	)

(a)


	Defined Benefit Pension Plans			Foreign Currency Translation Adjustments			Cash Flow Hedge Derivatives				Total
Balance at December 31, 2022	$	(1,067	)	$	(48,269	)	$	2,847			$	(46,489	)
Other comprehensive income before reclassifications		54			13,125			13,086				26,265
Income tax effect of other comprehensive income before reclassifications		(15	)		314			(2,770	)			(2,471	)
Amounts reclassified from accumulated other comprehensive loss into net income		23			—			(9,603	)	a		(9,580	)
Income taxes reclassified into net income		(6	)		—			2,121				2,115
Net current period other comprehensive income		56			13,439			2,834				16,329
Balance at December 31, 2023	$	(1,011	)	$	(34,830	)	$	5,681			$	(30,160	)

(a)

The amounts reclassified from accumulated other comprehensive loss are included in cost of sales. Refer to Note 13, "Financial Instruments," for additional information.

The Company expects all of the existing gains and losses related to foreign currency derivatives reported in accumulated other comprehensive loss as of December 31, 2025 to be reclassified into earnings during the next twelve months. See Note 13, "Financial Instruments," for additional information about derivative financial instruments and the effects from reclassification to net income.

Accounting for Stock Based Compensation - Summary of Recognized and Unrecognized Stock-based Compensation Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-Based Compensation Expense	$ 12,300	$ 10,432	$ 11,627
Unrecognized Stock-Based Compensation Expense	$ 22,249
Remaining Weighted Average Vesting Period	1 year 10 months 24 days
RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-Based Compensation Expense	$ 7,420	6,871	6,216
Unrecognized Stock-Based Compensation Expense	$ 12,891
Remaining Weighted Average Vesting Period	1 year 11 months 1 day
PSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-Based Compensation Expense	$ 3,776	2,454	4,661
Unrecognized Stock-Based Compensation Expense	$ 8,979
Remaining Weighted Average Vesting Period	1 year 11 months 8 days
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-Based Compensation Expense	$ 1,104	1,115	878
Unrecognized Stock-Based Compensation Expense	$ 379
Remaining Weighted Average Vesting Period	4 months 6 days
SARs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-Based Compensation Expense		$ (8)	$ (128)

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(v)
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-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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Reference 30: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (e)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

+ Details

Segment Reporting (Detail) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2025

Dec. 31, 2024

Dec. 31, 2023

Segment Reporting Information [Line Items]

Product revenues

$ 1,498,602

$ 1,456,124

^[1]

$ 1,469,076

United States

Segment Reporting Information [Line Items]

Product revenues

513,288

504,444

537,096

China

Segment Reporting Information [Line Items]

Product revenues

239,563

224,221

221,512

Germany

Segment Reporting Information [Line Items]

Product revenues

113,860

105,927

102,383

Czech Republic

Segment Reporting Information [Line Items]

Product revenues

89,648

78,785

69,714

South Korea

Segment Reporting Information [Line Items]

Product revenues

89,131

104,120

115,854

Mexico

Segment Reporting Information [Line Items]

Product revenues

67,008

43,327

45,733

Slovakia

Segment Reporting Information [Line Items]

Product revenues

55,493

55,085

44,946

Romania

Segment Reporting Information [Line Items]

Product revenues

54,304

52,616

53,982

Japan

Segment Reporting Information [Line Items]

Product revenues

47,601

53,730

60,879

United Kingdom

Segment Reporting Information [Line Items]

Product revenues

33,437

41,098

34,765

Other

Segment Reporting Information [Line Items]

Product revenues

195,269

192,771

182,212

Non U.S.

Segment Reporting Information [Line Items]

Product revenues

$ 985,314

$ 951,680

$ 931,980

[1]

Income Taxes - Deferred Tax Assets and Deferred Tax Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Deferred tax assets:
Net operating losses	$ 25,967	$ 35,966
Intangible assets	8,711	10,893
Research and development credits	5,920	5,475
Property and equipment	4,779	4,132
Valuation reserves and accrued liabilities	13,872	8,446
Capitalized research and development costs	26,548	28,318
Stock compensation	2,258	2,039
Defined benefit obligation	2,241	1,514
Inventory	1,198	717
Other credits	5,609
Unrealized foreign currency exchange losses	6,467
Other	14,921	8,707
Total deferred tax asset	118,491	106,207
Valuation allowance	(11,366)	(25,272)
Deferred tax liabilities:
Unrealized foreign currency exchange gains	(309)	(1,092)
Undistributed profits of subsidiary	(10,287)	(5,016)
Property and equipment	(6,820)	(10,524)
Intangible assets	(9,322)	(8,720)
Other	(6,663)	(1,383)
Total deferred tax liability	(33,401)	(26,735)
Net deferred tax asset	$ 73,724	$ 54,200

Fair Value Measurement - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2025 USD ($) Investment
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Number of equity investments \| Investment	2
Investment made	$ 4,941,000
Fair Value, Recurring Basis
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Financial liabilities, fair value	0
Fair Value, Nonrecurring Basis
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Financial liabilities, fair value	$ 0

- Definition

Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

+ References + Details

Accounting for Stock Based Compensation - Summarizes RSU Activity (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding at beginning of period, Shares	21,296	17,923	13,600
Granted, Shares	40,600	21,296	17,923
Vested, Shares	(21,296)	(17,923)	(11,900)
Forfeited, Shares			(1,700)
Outstanding at end of period, Shares	40,600	21,296	17,923
Outstanding at beginning of period, Weighted-Average Grant Date Fair Value	$ 50.72	$ 56.96	$ 73.54
Granted, Weighted-Average Grant Date Fair Value	26.6	50.72	56.96
Vested, Weighted-Average Grant Date Fair Value	50.72	56.96	73.54
Forfeited, Weighted-Average Grant Date Fair Value			73.54
Outstanding at end of period, Weighted-Average Grant Date Fair Value	$ 26.6	$ 50.72	$ 56.96
RSU \| Time Vesting Shares [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding at beginning of period, Shares	202,661	231,861	201,578
Granted, Shares	428,265	184,959	136,964
Vested, Shares	(87,155)	(129,477)	(82,695)
Forfeited, Shares	(16,467)	(84,682)	(23,986)
Outstanding at end of period, Shares	527,304	202,661	231,861
Outstanding at beginning of period, Weighted-Average Grant Date Fair Value	$ 56.35	$ 63.19	$ 64.27
Granted, Weighted-Average Grant Date Fair Value	31.82	54.2	58.68
Vested, Weighted-Average Grant Date Fair Value	57.85	64.55	59.43
Forfeited, Weighted-Average Grant Date Fair Value	43.41	57.71	59.47
Outstanding at end of period, Weighted-Average Grant Date Fair Value	$ 36.58	$ 56.35	$ 63.19

Overview

12 Months Ended

Dec. 31, 2025

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Overview

Note 1 — Overview

Gentherm Incorporated, a Michigan corporation, and its consolidated subsidiaries (“Gentherm”, “we”, “us”, “our” or the “Company”) is a global market leader of innovative thermal management and pneumatic comfort technologies. Our automotive products include Climate Control Seats (CCS®), Climate Control Interiors (CCI™), Lumbar and Massage Comfort Solutions, Valve Systems, and Climate and Comfort Electronics. We operate in locations aligned with our major customers’ product strategies to provide locally enhanced design, integration and production capabilities. Our medical products include patient temperature management systems that can be found in hospitals throughout the world.

On January 29, 2026, Gentherm, entered into definitive agreements to combine the Performance Technologies business (“Performance Technologies”) of Modine Manufacturing Co., a Wisconsin corporation (“Modine”), with Gentherm. Refer to Note 20 – Subsequent Event for details.

Goodwill and Other Intangibles

12 Months Ended

Dec. 31, 2025

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangibles

Note 6 — Goodwill and Other Intangibles

Goodwill

Changes in the carrying amount of goodwill, by reportable segment, for the years ended December 31, 2025 and 2024 were as follows:


	Automotive			Medical (a)			Total
Balance as of December 31, 2023	$	76,696		$	27,377		$	104,073
Currency translation		(3,942	)		(528	)		(4,470	)
Balance as of December 31, 2024	$	72,754		$	26,849		$	99,603
Currency translation		8,277			1,038			9,315
Balance as of December 31, 2025	$	81,031		$	27,887		$	108,918

(a)

Includes accumulated impairment losses of $19,509.

Other Intangible Assets

Other intangible assets and accumulated amortization balances as of December 31, 2025 and 2024 were as follows:


	Gross Carrying Value		Accumulated Amortization			Accumulated Impairment			Net Carrying Value
Definite-lived:
Customer relationships	$	121,316	$	(81,785	)	$	(6,185	)	$	33,346
Technology		48,478		(36,238	)		(27	)		12,213
Product development costs		19,943		(19,774	)		(71	)		98
Software development		1,007		(403	)		—			604
Indefinite-lived:
Trade names		7,065		—			(530	)		6,535
Balance as of December 31, 2025	$	197,809	$	(138,200	)	$	(6,813	)	$	52,796

	Gross Carrying Value		Accumulated Amortization			Accumulated Impairment			Net Carrying Value
Definite-lived:
Customer relationships	$	109,608	$	(67,787	)	$	(5,477	)	$	36,344
Technology		43,458		(29,976	)		(24	)		13,458
Product development costs		18,019		(17,849	)		—			170
Software development		1,007		(201	)		—			806
Indefinite-lived:
Trade names		7,003		—			(530	)		6,473
Balance as of December 31, 2024	$	179,095	$	(115,813	)	$	(6,031	)	$	57,251

During the year ended December 31, 2024 we recorded a non-cash impairment charge of $530 for one of our Medical trade names.

During the year ended December 31, 2023, an indicator of impairment was identified and the Company performed an interim quantitative assessment as of June 30, 2023. The results of this quantitative analysis indicated the carrying value of the reporting unit exceeded the fair value of the reporting unit, and accordingly an impairment expense was recorded for $19,509.

The Company performed its annual tests for impairment as of December 31, 2023, 2024 and 2025 utilizing the same quantitative approach and determined the fair value of each reporting unit exceeded its carrying value at each date.

A total of $7,135, $7,019, and $8,290 in other intangible assets were amortized in 2025, 2024 and 2023, respectively.

An estimate of future amortization of other intangible assets, is as follows:


2026	$	6,859
2027		6,771
2028		6,703
2029		5,963
2030		4,947

Debt (Tables)

12 Months Ended

Dec. 31, 2025

Debt Disclosure [Abstract]

Summary of Company's Debt

The following table summarizes the Company’s debt as of December 31, 2025 and 2024:


	December 31,
	2025						2024
	Interest Rate			Principal Balance			Interest Rate			Principal Balance
Revolving Credit Facility (U.S. Dollar denominations)		4.95	%	$	189,000			5.86	%	$	220,000
Finance leases		3.34	%		73			3.46	%		201
Total debt					189,073						220,201
Less: current maturities					(73	)					(137	)
Long-term debt, less current maturities				$	189,000					$	220,064

Principal Maturities of Debt

The scheduled principal maturities of our debt as of December 31, 2025 were as follows:


	Revolving Credit Facility		Other Debt		Total
2026	$	—	$	73	$	73
2027		189,000		—		189,000
Total	$	189,000	$	73	$	189,073

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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+ Details

Pension and Other Post Retirement Benefit Plans - Schedule of Future Expected Pension Payments (Detail) $ in Thousands	Dec. 31, 2025 USD ($)
United States
Defined Benefit Plan Disclosure [Line Items]
2026	$ 342
2027	342
2028	342
2029	342
2030	342
2031-2035	684
Total projected pension benefit payments	2,394
German Plan
Defined Benefit Plan Disclosure [Line Items]
2026	291
2027	291
2028	289
2029	1,855
2030	380
2031-2035	1,821
Total projected pension benefit payments	$ 4,927

Leases - Summary of Future Lease Payments for Non-Cancellable Operating Leases (Detail) $ in Thousands	Dec. 31, 2025 USD ($)
Leases [Abstract]
2026	$ 12,113
2027	8,828
2028	7,330
2029	6,520
2030	6,224
2031 or later	37,041
Total future minimum lease payments	78,056
Less imputed interest	(20,305)
Total	$ 57,751

Debt

12 Months Ended

Dec. 31, 2025

Debt Disclosure [Abstract]

Debt

Note 8 — Debt

The following table summarizes the Company’s debt as of December 31, 2025 and 2024:


	December 31,
	2025						2024
	Interest Rate			Principal Balance			Interest Rate			Principal Balance
Revolving Credit Facility (U.S. Dollar denominations)		4.95	%	$	189,000			5.86	%	$	220,000
Finance leases		3.34	%		73			3.46	%		201
Total debt					189,073						220,201
Less: current maturities					(73	)					(137	)
Long-term debt, less current maturities				$	189,000					$	220,064

Credit Agreement

On June 10, 2022, the Company entered into a Second Amended and Restated Credit Agreement (the “Second Amended and Restated Credit Agreement”) with a consortium of lenders and Bank of America, N.A. as administrative agent (the “Agent”). The amendment, among other things, extended the maturity date to June 10, 2027.

The Second Amended and Restated Credit Agreement provides for a $500,000 secured revolving credit facility (the “Revolving Credit Facility”), with a $50,000 sublimit for swing line loans and a $15,000 sublimit for the issuance of standby letters of credit. Any amount of the facility utilized for swing line loans or letters of credit outstanding will reduce the amount available under the Second Amended and Restated Credit Agreement. Subject to specified conditions, Gentherm can increase the Revolving Credit Facility or incur secured term loans in an aggregate amount of up to $200,000.

Under the Second Amended and Restated Credit Agreement, all obligations are unconditionally guaranteed by certain of the Company’s subsidiaries and a security interest is granted in substantially all of the personal property of the Company and its U.S. subsidiaries designated as borrowers, including the stock and membership interests of specified subsidiaries. The Second Amended and Restated Credit Agreement contains covenants, that, among other things, (i) prohibit or limit the ability to incur additional indebtedness, create liens, pay dividends, make certain types of investments (including acquisitions), enter into certain types of transactions with affiliates, prepay other indebtedness, sell assets or enter into certain other transactions outside the ordinary course of business, and (ii) require that Gentherm maintain a minimum Consolidated Interest Coverage Ratio and a maximum Consolidated Net Leverage Ratio (based on consolidated EBITDA for the applicable trailing four fiscal quarters) as of the end of any fiscal quarter. The Second Amended and Restated Credit Agreement also contains customary events of default. As of December 31, 2025, the Company was in compliance, in all material respects, with the terms of the Second Amended and Restated Credit Agreement.

Under the Second Amended and Restated Credit Agreement, U.S. Dollar denominated loans bear interest at either a base rate (“Base Rate Loans”) or Term Secured Overnight Financing Rate (“Term SOFR”) rate (“Term SOFR Rate Loans”), plus a margin (“Applicable Rate”). The rate for Base Rate Loans is equal to the highest of the Federal Funds Rate plus 0.50%, Bank of America’s prime rate, or the Term SOFR rate plus 1.00%. The rate for Term SOFR Rate Loans denominated in U.S. Dollars is equal to the forward-looking Term SOFR rate administered by the Chicago Mercantile Exchange with a term of one month. All loans denominated in a currency other than the U.S. Dollar must be Term SOFR Rate Loans. Interest is payable at least quarterly. Additionally, a commitment fee of between 0.175% to 0.300% is payable on the average daily unused amounts under the Revolving Credit Facility.

The Applicable Rate varies based on the Consolidated Net Leverage Ratio reported by the Company. As long as the Company is not in default of the terms and conditions of the Second Amended and Restated Credit Agreement, the lowest and highest possible Applicable Rate is 1.125% and 2.125%, respectively, for Term SOFR Rate Loans and 0.125% and 1.125%, respectively, for Base Rate Loans.

Based upon consolidated EBITDA for the trailing four fiscal quarters calculated for purposes of the Consolidated Net Leverage Ratio, $307,935 remained available for additional borrowings as of December 31, 2025.

The Company had $3,574 and $2,838 of outstanding letters of credit issued as of December 31, 2025 and December 31, 2024, respectively.

In connection with the Second Amended and Restated Credit Agreement, the Company incurred debt issuance costs of $1,520, which have been capitalized and are amortized into interest expense over the term of the Revolving Credit Facility.

The scheduled principal maturities of our debt as of December 31, 2025 were as follows:


	Revolving Credit Facility		Other Debt		Total
2026	$	—	$	73	$	73
2027		189,000		—		189,000
Total	$	189,000	$	73	$	189,073

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
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-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1E

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1I
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1I

Reference 22: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1I
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1I

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1I
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1I

+ Details

Segment Reporting - Segment Reporting About Property and Equipment, Net by Geographic Areas (Detail) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Segment Reporting Information [Line Items]
Property and equipment, net	$ 270,614	$ 252,970
Germany
Segment Reporting Information [Line Items]
Property and equipment, net	50,761	42,457
Mexico
Segment Reporting Information [Line Items]
Property and equipment, net	50,506	47,814
China
Segment Reporting Information [Line Items]
Property and equipment, net	47,414	44,767
United States
Segment Reporting Information [Line Items]
Property and equipment, net	40,361	42,928
North Macedonia
Segment Reporting Information [Line Items]
Property and equipment, net	29,375	25,374
Vietnam
Segment Reporting Information [Line Items]
Property and equipment, net	19,110	20,920
Czech Republic
Segment Reporting Information [Line Items]
Property and equipment, net	10,513	9,440
Hungary
Segment Reporting Information [Line Items]
Property and equipment, net	8,617	7,994
Ukraine
Segment Reporting Information [Line Items]
Property and equipment, net	5,467	5,174
Other
Segment Reporting Information [Line Items]
Property and equipment, net	$ 8,490	$ 6,102

Equity (Tables)

12 Months Ended

Dec. 31, 2025

Stockholders' Equity Note [Abstract]

Schedule of Share Repurchases and Related Activity

Share repurchases and related activity during the years ended December 31, 2025 and 2024 were as follows:


	Year Ended December 31,
	2025		2024
Total number of shares repurchased		381,600		1,019,314
Average price paid per share	$	26.24	$	49.22
Total	$	10,015	$	50,169

Excise tax charged	$	100	$	502

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Current Assets:
Cash and cash equivalents	$ 160,833	$ 134,134
Accounts receivable, net	281,083	258,112
Inventory, net	252,702	227,356
Other current assets	82,332	64,413
Total current assets	776,950	684,015
Property and equipment, net	270,614	252,970
Goodwill	108,918	99,603
Other intangible assets, net	52,796	57,251
Operating lease right-of-use assets	56,524	43,954
Deferred income tax assets	93,552	75,041
Other non-current assets	37,075	34,722
Total assets	1,396,429	1,247,556
Current Liabilities:
Accounts payable	260,487	226,815
Current lease liabilities	9,646	7,517
Current maturities of long-term debt	73	137
Other current liabilities	134,104	105,824
Total current liabilities	404,310	340,293
Long-term debt, less current maturities	189,000	220,064
Non-current lease liabilities	48,105	37,052
Pension benefit obligation	3,748	4,017
Other non-current liabilities	30,943	29,183
Total liabilities	676,106	630,609
Common Stock:
No par value, 55,000,000 shares authorized 30,526,231 and 30,788,639 issued and outstanding at December 31, 2025 and December 31, 2024, respectively	5,611	2,049
Paid-in capital	1,590	4,290
Accumulated other comprehensive loss	(964)	(85,193)
Accumulated earnings	714,086	695,801
Total shareholders’ equity	720,323	616,947
Total liabilities and shareholders’ equity	$ 1,396,429	$ 1,247,556

Supplier Finance Program

12 Months Ended

Dec. 31, 2025

Payables and Accruals [Abstract]

Supplier Finance Program

Note 11 — Supplier Finance Program

The Company is party to a supplier finance program with a third-party service provider (“Service Provider”), pursuant to which the Company has offered the opportunity to participate to certain of the Company's suppliers. The Company has no economic interest in a supplier’s participation and the Company has not pledged any assets to the Service Provider under this program.

Under this program, the Company and supplier initially agree on the contractual payment terms for the goods to be procured for the Company in the ordinary course. A supplier’s participation in this program is voluntary and does not impact its contractual payment terms with the Company, including the payment amount and timing of when payments are due. A participating supplier has the sole discretion to determine whether to discount one or more invoices, if any, to the Service Provider in exchange for payment by the Service Provider on an earlier date than provided for in the contract with the Company. Amounts due to participating suppliers are included in accounts payable in the consolidated balance sheets until the Company makes payment to the Service Provider, even though the payment of such amount will be made to the supplier at an earlier date by the Service Provider. Payments of the Company’s obligations to the Service Provider are reported as operating cash flows in the consolidated statements of cash flows.

The following is a reconciliation of the changes in confirmed obligations to participating suppliers:


	Year Ended December 31,
	2025			2024
Outstanding at beginning of year	$	21,232		$	—
Invoices confirmed		107,268			90,343
Invoices settled		(105,484	)		(69,111	)
Outstanding at end of year	$	23,016		$	21,232

Accounting for Stock Based Compensation

12 Months Ended

Dec. 31, 2025

Share-Based Payment Arrangement [Abstract]

Accounting for Stock Based Compensation

Note 17 — Accounting for Stock Based Compensation

On May 18, 2023 the Company’s shareholders approved the Gentherm Incorporated 2023 Equity Incentive Plan (the “2023 Equity Plan”), covering 3,730,000 shares of the Common Stock, plus the number of shares of Common Stock that, as of the effective date of the 2023 Equity Plan, that were subject to awards granted under the Gentherm Incorporated 2013 Equity Incentive Plan (the “2013 Equity Plan”) and that, on or after the effective date of the 2023 Equity Plan, were forfeited, surrendered, terminated (other than by exercise), cancelled, lapsed or reacquired by the Company prior to vesting, without the delivery of any shares of Common Stock, and otherwise comply with the recycling provisions of the 2013 Equity Plan and 2023 Equity Plan. The 2023 Equity Plan permits the granting of various awards including stock options (including both nonqualified stock options and incentive stock options), stock appreciation rights ("SARs"), restricted stock, restricted stock units ("RSUs"), performance stock units (including performance-based RSUs under the 2013 Equity Plan, "PSUs") and performance units, and other awards to employees, outside directors and consultants and advisors of the Company. As of December 31, 2025, the Company had an aggregate of 1,830,414 shares of Common Stock available to issue under the 2023 Equity Plan.

During the three-year period ended December 31, 2025, the Company had outstanding SARs, restricted stock awards, RSUs and PSUs to employees, directors and consultants. These awards become available to the recipient upon the satisfaction of a vesting condition, either based on a period of service or based on the performance of a specific achievement. For equity-based awards with a service condition, the requisite service period typically ranges between two to four years for employees and consultants and one year for directors. As of December 31, 2025, there were 493,798 PSUs outstanding. These awards cliff vest after three-years based on the Company’s achievement of one of five separate performance metrics: a target return on invested capital ratio (“ROIC”), as defined in the award agreement, for a specified fiscal year; a target three-year cumulative Adjusted EBITDA (“Adjusted EBITDA”), as defined in the award agreement; a target annual and three-year growth in the expansion of Adjusted EBITDA Margin Rate (“Adjusted EBITDA Margin Rate”), as defined in the award agreement (as modified by the Company’s relative total shareholder return); the Company’s relative total shareholder return (“TSR”), as defined in the award agreement, during a specific three-year measurement period; a target relative revenue growth relative to light vehicle production in the Company's relevant markets ("RRG"), as defined in the award agreement, during a specific three-year measurement period (in certain cases, as modified by the Company’s relative total shareholder return); and a target annual and three-year growth in the Company's absolute revenue ("Revenue Growth"), as defined in the award agreement, during a specific three-year measurement period. In each case, awards will be earned at 50% of the target

number of shares for achieving a minimum threshold or up to 200% of the target number of shares for exceeding the target, with a linear adjustment between threshold and target or between target and stretch performance goals. All other outstanding, unvested equity-based awards were service based. Equity-based award vesting may be accelerated at the discretion of the Board under conditions specified in the 2023 Equity Plan and the 2013 Equity Plan.

Under FASB ASC Topic 718, the provisions of the PSUs that vest upon the achievement of relative TSR are considered a market condition, and therefore the effect of that market condition is reflected in the grant date fair value for this portion award. A third party was engaged to complete a Monte Carlo simulation to account for the market condition. That simulation takes into account the beginning stock price of our Common Stock, the expected volatilities for the relative TSR comparator group, the expected volatilities for the Company’s stock price, correlation coefficients, the expected risk-free rate of return and the expected dividend yield of the Company and the comparator group. The single grant-date fair value computed by this valuation method is recognized by the Company in accounting for the awards regardless of the actual future outcome of the relative TSR feature. The grant date fair value of the other PSUs and RSUs are calculated as the closing price of our Common Stock as quoted on Nasdaq on the grant date multiplied by the number of shares subject to the award. Each of ROIC, Adjusted EBITDA, Adjusted EBITDA Margin Rate, RRG and Revenue Growth are considered a performance condition and the grant-date fair value for ROIC PSUs, Adjusted EBITDA PSUs, Adjusted EBITDA Margin Rate, RRG and Revenue Growth PSUs correspond with management's expectation of the probable outcome of the performance condition as of the grant date. The Adjusted EBITDA Margin Rate PSUs, the RRG PSUs and the Revenue Growth PSUs granted in 2024 and 2025 are also subject to a relative TSR modifier that can adjust the total payout of PSUs by -25% if performance does not reach threshold or +25% if performance exceeds maximum. Therefore, the grant date fair value of the Adjusted EBITDA Margin Rate PSUs and RRG PSUs for 2024 were further impacted by the fair value of the relative TSR modifier.

The total recognized and unrecognized stock based compensation expense is as follows:


Stock Based Compensation Expense	2025		2024			2023			Unrecognized Stock Based Compensation Expense at December 31, 2025		Remaining Weighted Average Vesting Period
RSUs	$	7,420	$	6,871		$	6,216		$	12,891		1.92
PSUs		3,776		2,454			4,661			8,979		1.94
Restricted Stock		1,104		1,115			878			379		0.35
SARs		—		(8	)		(128	)		—		—
Total stock based compensation	$	12,300	$	10,432		$	11,627		$	22,249		1.90

The related deferred tax benefit for the years ended December 31, 2025, 2024 and 2023 was $1,614, $1,485, and $1,794, respectively. If Gentherm were to realize expired stock based payment arrangements, they would be reported as a forfeit in the activity roll forward tables below.

RSUs

The following table summarizes RSU activity during the years ended December 31, 2025, 2024 and 2023:


Unvested Restricted Stock Units	Time Vesting Shares			Weighted-Average Grant Date Fair Value
Outstanding at December 31, 2022		201,578		$	64.27
Granted		136,964			58.68
Vested		(82,695	)		59.43
Forfeited		(23,986	)		59.47
Outstanding at December 31, 2023		231,861		$	63.19
Granted		184,959			54.20
Vested		(129,477	)		64.55
Forfeited		(84,682	)		57.71
Outstanding at December 31, 2024		202,661		$	56.35
Granted		428,265			31.82
Vested		(87,155	)		57.85
Forfeited		(16,467	)		43.41
Outstanding at December 31, 2025		527,304		$	36.58

The total intrinsic value of RSUs vested during the years ended December 31, 2025, 2024 and 2023 was $5,042, $8,358 and $4,915, respectively.

PSUs

The following table summarizes PSU activity during the years ended December 31, 2025, 2024 and 2023:


Unvested Performance Stock Units	Performance Stock Unit Shares			Weighted-Average Grant Date Fair Value
Outstanding at December 31, 2022		320,449		$	62.90
Granted		153,121			65.90
Performance Adjustment		(59,928	)		33.90
Vested		(59,928	)		49.25
Forfeited		(28,737	)		65.97
Outstanding at December 31, 2023		324,977		$	74.10
Granted		235,388			60.68
Performance Adjustment		(52,856	)		79.49
Vested		(27,850	)		92.44
Forfeited		(199,818	)		61.35
Outstanding at December 31, 2024		279,841		$	63.30
Granted		302,762			31.34
Performance Adjustment		(49,103	)		79.46
Vested		(25,303	)		72.44
Forfeited		(14,399	)		48.47
Outstanding at December 31, 2025		493,798		$	43.80

The total intrinsic value of PSUs vested during the years ended December 31, 2025, 2024 and 2023 was $1,833, $2,574 and $2,951, respectively.

Restricted Stock

The following table summarizes restricted stock activity during the years ended December 31, 2025, 2024 and 2023:


Unvested Restricted Stock	Shares			Weighted-Average Grant Date Fair Value
Outstanding at December 31, 2022		13,600		$	73.54
Granted		17,923			56.96
Vested		(11,900	)		73.54
Forfeited		(1,700	)		73.54
Outstanding at December 31, 2023		17,923		$	56.96
Granted		21,296			50.72
Vested		(17,923	)		56.96
Outstanding at December 31, 2024		21,296		$	50.72
Granted		40,600			26.60
Vested		(21,296	)		50.72
Outstanding at December 31, 2025		40,600		$	26.60

The compensation cost associated with restricted stock is estimated on the date of grant using quoted market prices (Level 1 input). The total fair value of restricted stock vested in 2025, 2024 and 2023 was $1,080, $1,021 and $875, respectively.

SARs

The following table summarizes SARs activity during the years ended December 31, 2025, 2024 and 2023:


Stock Appreciation Rights	Shares			Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term		Aggregate Intrinsic Value
Outstanding at December 31, 2022		14,750		$	38.05		1.15	$	402
Exercised		(12,500	)		38.05
Outstanding at December 31, 2023		2,250		$	38.05		0.15	$	32
Exercised		(2,250	)		38.05
Outstanding at December 31, 2024		—		$	—		—	$	—
Outstanding at December 31, 2025		—		$	—		—	$	—
Exercisable at December 31, 2025		—		$	—		—	$	—

The total intrinsic value of SARs exercised during the years ended December 31, 2025, 2024 and 2023 was $0, $25, and $242, respectively.

Stock Options

The following table summarizes stock option activity during the years ended December 31, 2025, 2024 and 2023:


Options	Shares			Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term		Aggregate Intrinsic Value
Outstanding at December 31, 2022		162,634		$	36.41		2.68	$	8,212
Exercised		(6,450	)		40.79
Forfeited		(16,500	)	$	41.59
Outstanding at December 31, 2023		139,684		$	35.59		0.90	$	2,342
Exercised		(139,684	)		35.59
Outstanding at December 31, 2024		—		$	—		—	$	—
Outstanding at December 31, 2025		—		$	—		—	$	—
Exercisable at December 31, 2025		—		$	—		—	$	—

The total intrinsic value of stock options exercised during the years ended December 31, 2025, 2024 and 2023 was $0, $2,071 and $201, respectively.

Financial Instruments - Summary of Receivables Factored and Availability Under Receivables Factoring Agreements (Details) $ in Thousands	Dec. 31, 2024 USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Receivables factored and outstanding	$ 755

Reclassifications Out of Accumulated Other Comprehensive Loss - Schedule of Reclassification Adjustments and Other Activities Impacting Accumulated Other Comprehensive Loss (Parenthetical) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive loss into cost of sales and interest expense, net	$ 4,984	$ 7,520	$ 9,580
Cost of sales
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive loss into cost of sales and interest expense, net	4,830
Interest Expense, Net
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive loss into cost of sales and interest expense, net	$ 232

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480870/815-30-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480870/815-30-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480870/815-30-50-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480870/815-30-50-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482765/220-10-50-4

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482765/220-10-50-5

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481674/830-30-50-1

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481694/830-30-45-17

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 20
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481694/830-30-45-20

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 20
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481694/830-30-45-20

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 20
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481694/830-30-45-20

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 20
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481694/830-30-45-20

+ Details

Supplier Finance Program - Summary of Reconciliation of Changes in Confirmed Obligations to Participating Suppliers (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Supplier Finance Program, Obligation [Roll Forward]
Outstanding at beginning of year	$ 21,232	$ 0
Invoices confirmed	107,268	90,343
Invoices settled	(105,484)	(69,111)
Outstanding at end of year	$ 23,016	$ 21,232

Pension and Other Post Retirement Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2025

Retirement Benefits [Abstract]

Components of Net Periodic Benefit Cost for Company's Defined Benefit Plans

The components of net periodic benefit cost for the Company’s defined benefit plans for the years ended December 31, 2025, 2024 and 2023 were as follows:


	U.S. Plan									German Plan
	Year Ended December 31,									Year Ended December 31,
	2025			2024			2023			2025			2024			2023
Net periodic benefit cost:
Service cost	$	—		$	—		$	—		$	—		$	—		$	—
Interest cost		97			101			115			226			234			217
Expected return on plan assets		—			—			—			(153	)		(130	)		(115	)
Amortization of prior service cost and actuarial loss		—			—			—			78			19			23
Net periodic benefit cost	$	97		$	101		$	115		$	151		$	123		$	125
Assumptions:
Discount rate		4.85	%		4.45	%		4.65	%		3.38	%		4.56	%		4.10	%
Long-term return on assets	N/A			N/A			N/A				3.50	%		3.20	%		3.20	%

Reconciliation of Change in Benefit Obligation, Change in Plan Assets and Balance Sheet Classification

A reconciliation of the change in benefit obligation and the change in plan assets for the years ended December 31, 2025 and 2024 is as follows:


	U.S. Plan						German Plan
	As of December 31,						As of December 31,
	2025			2024			2025			2024
Change in projected benefit obligation:
Balance at beginning of year	$	2,331		$	2,602		$	6,281		$	5,406
Interest cost		97			101			226			234
Paid pension distributions		(342	)		(342	)		(240	)		(256	)
Actuarial loss (gain)		43			(30	)		(181	)		1,259
Exchange rate impact		—			—			805			(362	)
Balance at end of year	$	2,129		$	2,331		$	6,891		$	6,281
Change in plan assets:
Balance at beginning of year	$	—		$	—		$	4,005		$	4,145
Actual return on plan assets		—			—			111			104
Contributions		—			—			—			—
Paid pension distributions		—			—			—			—
Exchange rate impact		—			—			523			(244	)
Balance at end of year	$	—		$	—		$	4,639		$	4,005

Underfunded Status	$	(2,129	)	$	(2,331	)	$	(2,252	)	$	(2,276	)

Balance sheet classification:
Other current liabilities	$	(342	)	$	(342	)	$	(291	)	$	(248	)
Pension benefit obligation		(1,787	)		(1,989	)		(1,961	)		(2,028	)
Accumulated other comprehensive loss (pre-tax):
Actuarial losses		236			194			2,104			2,063

Assumptions:
Discount rate		4.10	%		4.85	%		3.86	%		3.38	%

Summary of Pre-tax Amounts in AOCI Expected to Be Recognized in Net Periodic Benefit Cost

Pre-tax amounts included in AOCI that are expected to be recognized in net periodic benefit cost during the year ended December 31, 2026 are as follows:


	U.S Plan		German Plan
Actuarial losses	$	3	$	73

Schedule of Future Expected Pension Payments

The schedule of future expected pension payments is as follows:


	Projected Pension Benefit Payments
Year	U.S Plan		German Plan
2026	$	342	$	291
2027		342		291
2028		342		289
2029		342		1,855
2030		342		380
2031-2035		684		1,821
Total	$	2,394	$	4,927

Supplier Finance Program - Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Payables and Accruals [Abstract]
Outstanding payment obligations to suppliers	$ 23,016	$ 21,232	$ 0
Supplier Finance Program, Obligation, Statement of Financial Position [Extensible Enumeration]	Cash Provided by (Used in) Operating Activity, Including Discontinued Operation

Leases - Components of Lease Expense and Other Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Lease cost:
Operating lease cost	$ 13,739	$ 10,747	$ 9,606
Amortization of finance leases	161	370	390
Interest on lease liabilities - finance leases	5	14	28
Short-term lease cost	3,999	3,684	2,651
Total lease cost	17,904	14,815	$ 12,675
Operating cash flows for operating leases	12,992	10,428
Operating cash flows for finance leases	5	14
Financing cash flows for finance leases	149	383
Right-of-use lease assets obtained in exchange for lease obligations, Operating leases	$ 19,364	$ 30,720
Weighted-average remaining lease term, Operating leases	9 years 7 months 13 days	9 years 3 months 18 days
Weighted-average remaining lease term, Finance leases	6 months	1 year 6 months
Weighted-average discount rate, Operating leases	6.22%	6.09%
Weighted-average discount rate, Finance leases	3.34%	3.46%

Principal Maturities of Debt (Detail) $ in Thousands	Dec. 31, 2025 USD ($)
Debt Instrument [Line Items]
Debt maturing in 2026	$ 73
Debt maturing in 2027	189,000
Total	189,073
US and Euro Denominated Revolving Note
Debt Instrument [Line Items]
Debt maturing in 2027	189,000
Total	189,000
Other Debt
Debt Instrument [Line Items]
Debt maturing in 2026	73
Total	$ 73

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-8A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 235
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477314/942-235-S99-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-4

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(f))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 55
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482949/835-30-55-8

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

Reference 9: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481568/470-20-55-69B

Reference 10: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69C
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481568/470-20-55-69C

Reference 11: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481568/470-20-55-69E

Reference 12: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69F
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481568/470-20-55-69F

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

Reference 15: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1D
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1D

Reference 20: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1D
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1D

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1D
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1D

Reference 22: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1E
-Subparagraph (a)
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-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1E

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1E
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1E

Reference 24: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1E
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1E

Reference 25: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1F
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1F

Reference 26: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1F
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1F

Reference 27: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1F
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1F

Reference 28: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1F
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1F

Reference 29: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1I
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1I

Reference 30: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-2

Reference 31: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482900/835-30-50-1

+ Details

Leases (Tables)

12 Months Ended

Dec. 31, 2025

Leases [Abstract]

Components of Lease Expense and Other Information

Components of lease expense for the years ended December 31, 2025, 2024 and 2023 were as follows:


	Year Ended December 31,
	2025		2024		2023
Lease cost:
Operating lease cost	$	13,739	$	10,747	$	9,606
Amortization of finance leases		161		370		390
Interest on lease liabilities - finance leases		5		14		28
Short-term lease cost		3,999		3,684		2,651
Total lease cost	$	17,904	$	14,815	$	12,675

Other information related to leases is as follows:


	Year Ended December 31,
	2025		2024
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	12,992	$	10,428
Operating cash flows for finance leases		5		14
Financing cash flows for finance leases		149		383
Right-of-use lease assets obtained in exchange for lease obligations:
Operating leases	$	19,364	$	30,720

	December 31, 2025		December 31, 2024
Weighted average remaining lease term:
Operating leases	9.62 yrs		9.3 years
Finance leases	0.50 yrs		1.5 years
Weighted average discount rate:
Operating leases	6.22%			6.09	%
Finance leases	3.34%			3.46	%

A summary of future lease payments for non-cancellable

Summary of Future Lease Payments for Non-Cancellable Operating Leases

A summary of future lease payments for non-cancellable operating leases with terms exceeding one year, as of December 31, 2025, is as follows:


2026	$	12,113
2027		8,828
2028		7,330
2029		6,520
2030		6,224
2031 or later		37,041
Total future minimum lease payments		78,056
Less imputed interest		(20,305	)
Total	$	57,751

Summary of Future Lease Payments for Non-Cancellable Finance Leases

A summary of future lease payments for non-cancellable finance leases with terms exceeding one year, as of December 31, 2025, is as follows:


2026	$	73
Total	$	73

Financial Instruments

12 Months Ended

Dec. 31, 2025

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Financial Instruments

Note 13 —Financial Instruments

Derivative Financial Instruments

The Company is exposed to various market risks including, but not limited to, changes in foreign currency exchange rates, changes in interest rates and price fluctuations of certain material commodities.

The Company regularly enters into derivative contracts with the objective of managing its financial and operational exposure arising from these risks by offsetting gains and losses on the underlying exposures with gains and losses on the financial instruments used to hedge them. The decision of whether and when to execute derivative financial instruments, along with the duration of the instrument, may vary from period to period depending on market conditions, the relative costs of the instruments and capacity to hedge. The duration is linked to the timing of the underlying exposure, with the connection between the two being regularly monitored. The Company does not enter into derivative financial instruments for speculative or trading purposes.

Information related to the recurring fair value measurement of derivative financial instruments in the consolidated balance sheet as of December 31, 2025 is as follows:


				Asset Derivatives			Liability Derivatives
	Fair Value Hierarchy	Notional Amount		Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value		Net Asset/ (Liabilities)
Derivatives Designated as Cash Flow Hedges
Foreign currency derivatives	Level 2	$	35,122	Other current assets	$	4,521	Other current liabilities	$	—	$	4,521
Interest rate contracts	Level 2	$	100,000	Other current assets	$	—	Other current liabilities	$	775	$	(775	)

Information related to the recurring fair value measurement of derivative financial instruments in the consolidated balance sheet as of December 31, 2024 is as follows:


				Asset Derivatives			Liability Derivatives
	Fair Value Hierarchy	Notional Amount		Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value		Net Asset/ (Liabilities)
Derivatives Designated as Cash Flow Hedges
Foreign currency derivatives	Level 2	$	126,496	Other current assets	$	—	Other current liabilities	$	2,037	$	(2,037	)
Derivatives Not Designated as Hedging Instruments
Interest rate contracts	Level 2	$	100,000	Other current assets	$	719	Other current liabilities	$	—	$	719

Information related to the effect of derivative instruments in the consolidated statements of income is as follows:


		Year Ended December 31,
	Location	2025			2024			2023
Derivatives Designated as Cash Flow Hedges
Foreign currency derivatives	Cost of sales – income	$	2,883		$	3,717		$	8,630
	Other comprehensive income (loss)		8,505			(11,259	)		3,483
Total foreign currency derivatives		$	11,388		$	(7,542	)	$	12,113

Interest rate contracts	Interest expense, net	$	232		$	—		$	—
	Other comprehensive income (loss)		(775	)		—			—
Total interest rate derivatives		$	(543	)	$	—		$	—

Derivatives Not Designated as Hedging Instruments
Interest rate contracts	Interest expense, net	$	(719	)	$	(1,343	)	$	(710	)
Total interest rate derivatives		$	(719	)	$	(1,343	)	$	(710	)

The Company did not incur any hedge ineffectiveness during the years ended December 31, 2025, 2024 and 2023.

Accounts Receivable Factoring

The Company previously sold certain customer trade receivables on a non-recourse basis under factoring arrangements with designated financial institutions. The sale of receivables under these agreements was considered an off-balance sheet arrangement to the Company and was accounted for as a true sale and excluded from accounts receivable in the consolidated balance sheets. These factoring arrangements included a deferred purchase price component in which a portion of the purchase price for the receivable was paid by the financial institution in cash upon sale and the remaining portion was recorded as a deferred purchase price receivable and paid at a later date. Deferred purchase price receivables are recorded in other current assets within the consolidated balance sheets. Cash proceeds received upon the sale of the receivables are included in net cash from operating activities and the cash proceeds received on the deferred purchase price receivables are included in net cash from investing activities. During the year ended December 31, 2024, the factoring agreements the Company was party to either expired or were terminated.

Receivables factored under receivables factoring agreements balance as of December 31, 2024 were as follows:


	December 31, 2024
Receivables factored and outstanding	$	755

Trade receivables sold and factoring fees incurred during the year ended December 31, 2024 were as follows:


	Year ended December 31, 2024
Trade receivables sold	$	98,761
Factoring fees incurred		615

Segment Reporting (Tables)

12 Months Ended

Dec. 31, 2025

Segment Reporting [Abstract]

Segment Information about Reported Product Revenues,Depreciation and Amortization and Operating Income (Loss)

The table below presents segment information about the reported product revenues, operating income (loss), and significant segment expenses of the Company for the years ended December 31, 2025, 2024 and 2023:


	Year Ended December 31,
Product Revenues	2025			2024			2023
Automotive	$	1,448,826		$	1,406,278		$	1,422,952
Medical		49,776			49,846			46,124
Total		1,498,602			1,456,124			1,469,076

Significant Segment Expenses and Operating Performance
Automotive
Cost of sales		1,110,222			1,058,989			1,090,941
Net research and development expenses		73,694			68,787			70,778
Selling, general and administrative expenses		67,040			65,924			72,090
Restructuring expenses, net		12,279			12,238			3,187
Loss on sale of land and building, net		2,196			—			—
Automotive operating income		183,395			200,340			185,956

Medical
Cost of sales		26,204			25,868			24,619
Other operating expenses		23,114			21,836			24,230
Impairment of intangible assets and property and equipment		—			2,501			19,509
Medical operating income (loss)		458			(359	)		(22,234	)

Corporate and Other Unallocated Expenses
Corporate and other unallocated expenses		(101,153	)		(92,966	)		(86,283	)
Total consolidated operating income	$	82,700		$	107,015		$	77,439

Other Segment Disclosures
Depreciation and Amortization
Automotive	$	47,701		$	47,752		$	45,845
Medical		3,403			3,542			3,654
Corporate		2,275			1,681			1,449
Total	$	53,379		$	52,975		$	50,948

Segment Information About Reported Segment Product Revenues by Product Category

Automotive and Medical segment product revenues by product category for each of the years ended December 31, 2025, 2024 and 2023 are as follows:


	Year Ended December 31,
	2025		2024 (a)		2023 (a)
Climate Control Seats	$	793,314	$	771,310	$	797,588
Lumbar and Massage Comfort Solutions		212,182		178,584		144,923
Climate Control Interiors		197,901		186,972		177,976
Climate and Comfort Electronics		29,664		17,363		12,860
Automotive Climate and Comfort Solutions		1,233,061		1,154,229		1,133,347
Valve Systems		96,877		105,056		106,262
Other Automotive		118,888		146,993		183,343
Subtotal Automotive segment		1,448,826		1,406,278		1,422,952
Medical segment		49,776		49,846		46,124
Total Company	$	1,498,602	$	1,456,124	$	1,469,076

(a)

Product Revenues Information by Geographic Area

Revenue (based on shipment destination) by geographic area for each of the years ended December 31, 2025, 2024 and 2023 is as follows:


	Year Ended December 31,
	2025		2024		2023
United States	$	513,288	$	504,444	$	537,096
China		239,563		224,221		221,512
Germany		113,860		105,927		102,383
Czech Republic		89,648		78,785		69,714
South Korea		89,131		104,120		115,854
Mexico		67,008		43,327		45,733
Slovakia		55,493		55,085		44,946
Romania		54,304		52,616		53,982
Japan		47,601		53,730		60,879
United Kingdom		33,437		41,098		34,765
Other		195,269		192,771		182,212
Total Non-U.S.		985,314		951,680		931,980
Total Company	$	1,498,602	$	1,456,124	$	1,469,076

Schedule of Property and Equipment, Net by Geographic Area

Property and equipment, net, for each of the geographic areas in which the Company operates as of December 31, 2025 and 2024 is as follows:


	December 31,
Property and equipment, net	2025		2024
Germany	$	50,761	$	42,457
Mexico		50,506		47,814
China		47,414		44,767
United States		40,361		42,928
North Macedonia		29,375		25,374
Vietnam		19,110		20,920
Czech Republic		10,513		9,440
Hungary		8,617		7,994
Ukraine		5,467		5,174
Other		8,490		6,102
Total	$	270,614	$	252,970

Details of Certain Financial Statement Components (Tables)

12 Months Ended

Dec. 31, 2025

Financial Statement Components [Abstract]

Details of Certain Financial Statement Components


	December 31,
	2025			2024
Inventory:
Raw materials, net	$	128,315		$	137,511
Work in process, net		35,429			19,059
Finished goods, net		88,958			70,786
Total inventory, net	$	252,702		$	227,356
Other current assets:
Income tax and other tax receivable	$	23,826		$	20,611
Billable tooling		23,553			19,740
Notes receivable		13,490			11,190
Prepaid expenses		9,214			6,305
Short-term derivative financial instruments		4,521			719
Receivables due from factor		—			1,111
Other		7,728			4,737
Total other current assets	$	82,332		$	64,413
Property and equipment:
Machinery and equipment	$	316,212		$	260,578
Buildings and improvements		124,900			117,953
Information technology		58,910			45,157
Production tooling		42,500			37,765
Leasehold improvements		26,144			23,262
Construction in progress		23,510			36,846
Total property and equipment		592,176			521,561
Less: accumulated depreciation		(321,562	)		(268,591	)
Total property and equipment, net	$	270,614		$	252,970
Other current liabilities:
Accrued employee liabilities	$	49,924		$	42,277
Income tax and other taxes payable		31,172			26,385
Liabilities from discounts and rebates		22,391			20,501
Restructuring		6,928			3,288
Accrued warranty		7,805			3,507
Short-term derivative financial instruments		775			2,037
Other		15,109			7,829
Total other current liabilities	$	134,104		$	105,824

Reclassifications Out of Accumulated Other Comprehensive Loss - Schedule of Reclassification Adjustments and Other Activities Impacting Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2025

Dec. 31, 2024

Dec. 31, 2023

Accumulated Other Comprehensive Income Loss [Line Items]

Beginning Balance

$ 616,947

$ 644,722

$ 672,273

Other comprehensive (loss) income before reclassifications

90,878

(50,409)

26,265

Income tax effect of other comprehensive (loss) income before reclassifications

(2,671)

1,372

(2,471)

Amounts reclassified from accumulated other comprehensive loss into net income

(4,984)

(7,520)

(9,580)

Income taxes reclassified into net income

1,006

1,524

2,115

Other comprehensive income (loss), net of tax

84,229

(55,033)

16,329

Ending Balance

720,323

616,947

644,722

Defined Benefit Pension Plans

Accumulated Other Comprehensive Income Loss [Line Items]

Beginning Balance

(1,851)

(1,011)

(1,067)

Other comprehensive (loss) income before reclassifications

103

(1,242)

Income tax effect of other comprehensive (loss) income before reclassifications

(30)

335

(15)

Amounts reclassified from accumulated other comprehensive loss into net income

Income taxes reclassified into net income

(21)

(24)

(6)

Other comprehensive income (loss), net of tax

130

(840)

Ending Balance

(1,721)

(1,851)

(1,011)

Foreign Currency Translation Adjustments

Accumulated Other Comprehensive Income Loss [Line Items]

Beginning Balance

(80,096)

(34,830)

(48,269)

Other comprehensive (loss) income before reclassifications

77,982

(45,519)

13,125

Income tax effect of other comprehensive (loss) income before reclassifications

253

314

Other comprehensive income (loss), net of tax

77,982

(45,266)

13,439

Ending Balance

(2,114)

(80,096)

(34,830)

Accumulated Other Comprehensive Loss

Accumulated Other Comprehensive Income Loss [Line Items]

Beginning Balance

(85,193)

(30,160)

(46,489)

Other comprehensive income (loss), net of tax

84,229

(55,033)

16,329

Ending Balance

(964)

(85,193)

(30,160)

Cash Flow Hedge Derivatives

Accumulated Other Comprehensive Income Loss [Line Items]

Beginning Balance

(3,246)

5,681

2,847

Other comprehensive (loss) income before reclassifications

12,793

(3,648)

13,086

Income tax effect of other comprehensive (loss) income before reclassifications

(2,641)

784

(2,770)

Amounts reclassified from accumulated other comprehensive loss into net income

(5,062)

^[1]

(7,611)

^[2]

(9,603)

^[3]

Income taxes reclassified into net income

1,027

1,548

2,121

Other comprehensive income (loss), net of tax

6,117

(8,927)

2,834

Ending Balance

$ 2,871

$ (3,246)

$ 5,681

[1]	The amounts reclassified from accumulated other comprehensive loss of $4,830 and $232 are included in cost of sales and interest expense, net, respectively, in the consolidated statements of income. Refer to Note 13, "Financial Instruments," for additional information.
[2]	The amounts reclassified from accumulated other comprehensive loss are included in cost of sales in the consolidated statements of income. Refer to Note 13, "Financial Instruments," for additional information.
[3]	The amounts reclassified from accumulated other comprehensive loss are included in cost of sales. Refer to Note 13, "Financial Instruments," for additional information.

Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2032	Dec. 31, 2028	Dec. 31, 2027	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Taxes [Line Items]
Undistributed earnings offsetting with dividend received deduction percent				100.00%
Indefinitely reinvested earnings of foreign subsidiaries				$ 0
Undistributed earnings of foreign subsidiaries				6,963,000
Undistributed earnings				115,705,000
Deferred tax assets				118,491,000	$ 106,207,000
Valuation allowance				11,366,000	25,272,000
Total unrecognized tax benefits				7,720,000	8,266,000	$ 5,486,000	$ 6,185,000
Cash paid for income taxes, net of refunds				$ 37,209,000	20,837,000	23,273,000
Scenario Forecast
Income Taxes [Line Items]
Corporate Tax Rate	10.00%	1.00%	15.00%
U.S. State \| Earliest Tax Year
Income Taxes [Line Items]
Operating loss carryforward, year of expiration				2026
U.S. State \| Latest Tax Year
Income Taxes [Line Items]
Operating loss carryforward, year of expiration				2044
Non-U.S. Subsidiaries
Income Taxes [Line Items]
Operating loss carryforward, amount				$ 183,419,000
Net operating loss carryforward, year of expiration				no expiration date
Valuation allowance				$ 0
Deferred tax assets				$ 21,442,000
Foreign Jurisdictions
Income Taxes [Line Items]
Income tax holiday, description				The Company currently benefits from incentive tax rates in various non-U.S. jurisdictions with expiration dates from 2026 – 2028.
Income tax holiday, income in foreign jurisdictions				$ 17,380,000	$ 50,372,000	$ 8,185,000

Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Balance at beginning of year	$ 8,266	$ 5,486	$ 6,185
Additions based on tax position related to current year	797	78	87
Additions based on tax position related to prior year	40	4,587	347
Reductions from settlements and statute of limitation expiration	(2,132)	(1,636)	(1,266)
Effect of foreign currency translation	749	(249)	133
Balance at end of year	$ 7,720	$ 8,266	$ 5,486

Pension and Other Post Retirement Benefit Plans - Summary of Pre-tax Amounts in AOCI Expected to Be Recognized in Net Periodic Benefit Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2026	Dec. 31, 2025	Dec. 31, 2024
United States
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses		$ 236	$ 194
United States \| Scenario Forecast
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses	$ 3
German Plan
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses		$ 2,104	$ 2,063
German Plan \| Scenario Forecast
Defined Benefit Plan Disclosure [Line Items]
Actuarial losses	$ 73

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2025

Commitments and Contingencies Disclosure [Abstract]

Reconciliation of Changes in Accrued Warranty Costs

The following is a reconciliation of the changes in accrued warranty costs:


	Year Ended December 31,
	2025			2024
Balance at beginning of year	$	3,507		$	3,945
Warranty claims paid		(9,069	)		(6,382	)
Warranty expense for products shipped during the current period		11,706			5,812
Adjustments to warranty estimates from prior periods		1,486			247
Adjustments due to currency translation		175			(115	)
Balance at end of year	$	7,805		$	3,507

Income Taxes - Schedule of Cash Paid (Received) for Income Taxes, Net of Refunds (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Paid, by Individual Jurisdiction [Line Items]
Total cash paid for income taxes, net of refunds	$ 37,209	$ 20,837	$ 23,273
Federal
Income Tax Paid, by Individual Jurisdiction [Line Items]
Federal	687
Other state and local jurisdictions
Income Tax Paid, by Individual Jurisdiction [Line Items]
Other state and local jurisdictions	(110)
Foreign Jurisdictions
Income Tax Paid, by Individual Jurisdiction [Line Items]
Total Foreign	36,632
Foreign Jurisdictions \| Canada
Income Tax Paid, by Individual Jurisdiction [Line Items]
Total Foreign	(2,003)
Foreign Jurisdictions \| China
Income Tax Paid, by Individual Jurisdiction [Line Items]
Total Foreign	11,903
Foreign Jurisdictions \| Germany
Income Tax Paid, by Individual Jurisdiction [Line Items]
Total Foreign	3,337
Foreign Jurisdictions \| Hungary
Income Tax Paid, by Individual Jurisdiction [Line Items]
Total Foreign	7,676
Foreign Jurisdictions \| Korea
Income Tax Paid, by Individual Jurisdiction [Line Items]
Total Foreign	3,606
Foreign Jurisdictions \| Malta
Income Tax Paid, by Individual Jurisdiction [Line Items]
Total Foreign	4,997
Foreign Jurisdictions \| Mexico
Income Tax Paid, by Individual Jurisdiction [Line Items]
Total Foreign	3,296
Other Foreign Jurisdictions
Income Tax Paid, by Individual Jurisdiction [Line Items]
Total Foreign	$ 3,820

Segment Reporting - Additional Information (Details)	12 Months Ended
Segment Reporting - Additional Information (Details)	Dec. 31, 2025 Segment
Segment Reporting [Abstract]
Number of reportable segments	2
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]	srt:ChiefExecutiveOfficerMember
Segment reporting, CODM, profit (loss) measure, how used, description	Our CODM uses operating income or loss to evaluate the performance and allocate resources for each of the Company’s segments. Operating income or loss is used to monitor budget versus actual results and year-over-year actual results to inform the decisions of how to allocate capital and resources within the Company.

Summary of Significant Accounting Policies - Fair Value and Corresponding Useful Lives for Acquired Intangibles Assets (Detail)	12 Months Ended
	Dec. 31, 2025
Customer Related \| Minimum
Finite Lived Intangible Assets [Line Items]
Weighted Average Life (in years)	8 years
Customer Related \| Maximum
Finite Lived Intangible Assets [Line Items]
Weighted Average Life (in years)	15 years
Technology \| Minimum
Finite Lived Intangible Assets [Line Items]
Weighted Average Life (in years)	5 years
Technology \| Maximum
Finite Lived Intangible Assets [Line Items]
Weighted Average Life (in years)	12 years
Software Development Costs \| Minimum
Finite Lived Intangible Assets [Line Items]
Weighted Average Life (in years)	4 years
Software Development Costs \| Maximum
Finite Lived Intangible Assets [Line Items]
Weighted Average Life (in years)	5 years
Product Development Costs \| Minimum
Finite Lived Intangible Assets [Line Items]
Weighted Average Life (in years)	5 years
Product Development Costs \| Maximum
Finite Lived Intangible Assets [Line Items]
Weighted Average Life (in years)	10 years

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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+ Details

Goodwill and Other Intangibles - Summary of Other Intangible Assets and Accumulated Amortization Balances (Detail) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Intangible Assets [Line Items]
Gross Carrying Value	$ 197,809	$ 179,095
Accumulated Amortization	(138,200)	(115,813)
Accumulated Impairment	(6,813)	(6,031)
Net Carrying Value	52,796	57,251
Net Carrying Value	52,796	57,251
Customer Relationships
Intangible Assets [Line Items]
Gross Carrying Value	121,316	109,608
Accumulated Amortization	(81,785)	(67,787)
Accumulated Impairment	(6,185)	(5,477)
Net Carrying Value	33,346	36,344
Technology
Intangible Assets [Line Items]
Gross Carrying Value	48,478	43,458
Accumulated Amortization	(36,238)	(29,976)
Accumulated Impairment	(27)	(24)
Net Carrying Value	12,213	13,458
Product Development Costs
Intangible Assets [Line Items]
Gross Carrying Value	19,943	18,019
Accumulated Amortization	(19,774)	(17,849)
Accumulated Impairment	(71)
Net Carrying Value	98	170
Software Development
Intangible Assets [Line Items]
Gross Carrying Value	1,007	1,007
Accumulated Amortization	(403)	(201)
Net Carrying Value	604	806
Trade Names
Intangible Assets [Line Items]
Gross Carrying Value	7,065	7,003
Accumulated Impairment	(530)	(530)
Net Carrying Value	$ 6,535	$ 6,473

Details of Certain Financial Statement Components

12 Months Ended

Dec. 31, 2025

Financial Statement Components [Abstract]

Details of Certain Financial Statement Components

Note 5 — Details of Certain Financial Statement Components


	December 31,
	2025			2024
Inventory:
Raw materials, net	$	128,315		$	137,511
Work in process, net		35,429			19,059
Finished goods, net		88,958			70,786
Total inventory, net	$	252,702		$	227,356
Other current assets:
Income tax and other tax receivable	$	23,826		$	20,611
Billable tooling		23,553			19,740
Notes receivable		13,490			11,190
Prepaid expenses		9,214			6,305
Short-term derivative financial instruments		4,521			719
Receivables due from factor		—			1,111
Other		7,728			4,737
Total other current assets	$	82,332		$	64,413
Property and equipment:
Machinery and equipment	$	316,212		$	260,578
Buildings and improvements		124,900			117,953
Information technology		58,910			45,157
Production tooling		42,500			37,765
Leasehold improvements		26,144			23,262
Construction in progress		23,510			36,846
Total property and equipment		592,176			521,561
Less: accumulated depreciation		(321,562	)		(268,591	)
Total property and equipment, net	$	270,614		$	252,970
Other current liabilities:
Accrued employee liabilities	$	49,924		$	42,277
Income tax and other taxes payable		31,172			26,385
Liabilities from discounts and rebates		22,391			20,501
Restructuring		6,928			3,288
Accrued warranty		7,805			3,507
Short-term derivative financial instruments		775			2,037
Other		15,109			7,829
Total other current liabilities	$	134,104		$	105,824

Summary of Significant Accounting Policies - Summary of Percentage of Product Revenues and Accounts Receivable (Details) - Customer Concentration Risk	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Lear \| Sales Revenue, Net
Segment Reporting Information [Line Items]
Concentration risk percentage	16.00%	16.00%	15.00%
Lear \| Accounts Receivable, Net
Segment Reporting Information [Line Items]
Concentration risk percentage	17.00%	16.00%
Adient \| Sales Revenue, Net
Segment Reporting Information [Line Items]
Concentration risk percentage	11.00%	11.00%	13.00%
Adient \| Accounts Receivable, Net
Segment Reporting Information [Line Items]
Concentration risk percentage	11.00%	11.00%

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References + Details

Commitments and Contingencies - Additional Information (Detail) - Vehicle	12 Months Ended
	Dec. 31, 2025	Apr. 30, 2025	Feb. 14, 2024
Loss Contingencies [Line Items]
Number of vehicles recalled		13,508	261,257
Labor Agreements
Loss Contingencies [Line Items]
Percentage of workforce as members of industrial trade unions or worker councils	36.00%

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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+ Details

Income Taxes - Earnings Before Income Taxes and Tax Provisions - (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
(Loss) earnings before income tax:
Domestic	$ (104,058)	$ (54,073)	$ (37,222)
Foreign	139,893	156,338	92,176
Earnings before income tax	$ 35,835	$ 102,265	$ 54,954

- Definition

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

+ References

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+ Details

Accounting for Stock Based Compensation - Summarizes PSU Activity (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding at beginning of period, Shares	21,296	17,923	13,600
Granted, Shares	40,600	21,296	17,923
Vested, Shares	(21,296)	(17,923)	(11,900)
Forfeited, Shares			(1,700)
Outstanding at end of period, Shares	40,600	21,296	17,923
Outstanding at beginning of period, Weighted-Average Grant Date Fair Value	$ 50.72	$ 56.96	$ 73.54
Granted, Weighted-Average Grant Date Fair Value	26.6	50.72	56.96
Vested, Weighted-Average Grant Date Fair Value	50.72	56.96	73.54
Forfeited, Weighted-Average Grant Date Fair Value			73.54
Outstanding at end of period, Weighted-Average Grant Date Fair Value	$ 26.6	$ 50.72	$ 56.96
Performance Based Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding at beginning of period, Shares	279,841	324,977	320,449
Granted, Shares	302,762	235,388	153,121
Performance Adjustment, Shares	(49,103)	(52,856)	(59,928)
Vested, Shares	(25,303)	(27,850)	(59,928)
Forfeited, Shares	(14,399)	(199,818)	(28,737)
Outstanding at end of period, Shares	493,798	279,841	324,977
Outstanding at beginning of period, Weighted-Average Grant Date Fair Value	$ 63.3	$ 74.1	$ 62.9
Granted, Weighted-Average Grant Date Fair Value	31.34	60.68	65.9
Performance Adjustment, Weighted-Average Grant Date Fair Value	79.46	79.49	33.9
Vested, Weighted-Average Grant Date Fair Value	72.44	92.44	49.25
Forfeited, Weighted-Average Grant Date Fair Value	48.47	61.35	65.97
Outstanding at end of period, Weighted-Average Grant Date Fair Value	$ 43.8	$ 63.3	$ 74.1

Income Taxes - Net Operating Loss Carryforwards (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($)
U.S. state income tax
Operating Loss Carryforwards [Line Items]
Operating loss carryforward, amount	$ 43,305
U.S. state income tax \| Minimum
Operating Loss Carryforwards [Line Items]
Operating loss carryforward, year of expiration	2026
U.S. state income tax \| Maximum
Operating Loss Carryforwards [Line Items]
Operating loss carryforward, year of expiration	2044
Foreign, Never
Operating Loss Carryforwards [Line Items]
Operating loss carryforward, amount	$ 183,419
Operating loss carryforward, year of expiration	Never

Pension and Other Post Retirement Benefit Plans

12 Months Ended

Dec. 31, 2025

Retirement Benefits [Abstract]

Pension and Other Post Retirement Benefit Plans

Note 9 — Pension and Other Post Retirement Benefit Plans

The Company maintains a U.S. defined benefit pension plan covering a former Company executive (“U.S. Plan”) and a German defined benefit pension plan covering certain retired executive employees of the Company’s wholly owned subsidiary, Gentherm GmbH (“German Plan”).

The components of net periodic benefit cost for the Company’s defined benefit plans for the years ended December 31, 2025, 2024 and 2023 were as follows:


	U.S. Plan									German Plan
	Year Ended December 31,									Year Ended December 31,
	2025			2024			2023			2025			2024			2023
Net periodic benefit cost:
Service cost	$	—		$	—		$	—		$	—		$	—		$	—
Interest cost		97			101			115			226			234			217
Expected return on plan assets		—			—			—			(153	)		(130	)		(115	)
Amortization of prior service cost and actuarial loss		—			—			—			78			19			23
Net periodic benefit cost	$	97		$	101		$	115		$	151		$	123		$	125
Assumptions:
Discount rate		4.85	%		4.45	%		4.65	%		3.38	%		4.56	%		4.10	%
Long-term return on assets	N/A			N/A			N/A				3.50	%		3.20	%		3.20	%

A reconciliation of the change in benefit obligation and the change in plan assets for the years ended December 31, 2025 and 2024 is as follows:


	U.S. Plan						German Plan
	As of December 31,						As of December 31,
	2025			2024			2025			2024
Change in projected benefit obligation:
Balance at beginning of year	$	2,331		$	2,602		$	6,281		$	5,406
Interest cost		97			101			226			234
Paid pension distributions		(342	)		(342	)		(240	)		(256	)
Actuarial loss (gain)		43			(30	)		(181	)		1,259
Exchange rate impact		—			—			805			(362	)
Balance at end of year	$	2,129		$	2,331		$	6,891		$	6,281
Change in plan assets:
Balance at beginning of year	$	—		$	—		$	4,005		$	4,145
Actual return on plan assets		—			—			111			104
Contributions		—			—			—			—
Paid pension distributions		—			—			—			—
Exchange rate impact		—			—			523			(244	)
Balance at end of year	$	—		$	—		$	4,639		$	4,005

Underfunded Status	$	(2,129	)	$	(2,331	)	$	(2,252	)	$	(2,276	)

Balance sheet classification:
Other current liabilities	$	(342	)	$	(342	)	$	(291	)	$	(248	)
Pension benefit obligation		(1,787	)		(1,989	)		(1,961	)		(2,028	)
Accumulated other comprehensive loss (pre-tax):
Actuarial losses		236			194			2,104			2,063

Assumptions:
Discount rate		4.10	%		4.85	%		3.86	%		3.38	%

Pre-tax amounts included in AOCI that are expected to be recognized in net periodic benefit cost during the year ended December 31, 2026 are as follows:


	U.S Plan		German Plan
Actuarial losses	$	3	$	73

Interest costs are recognized in selling, general and administrative expenses in the consolidated statements of income and actuarial gains and losses are included the consolidated balance sheets as part of accumulated other comprehensive loss within shareholders’ equity. Actuarial gains or losses are amortized to selling, general and administrative expense in the consolidated statements of income based on the average future life of the U.S Plan or German Plan using the corridor method. Prior service cost is included in selling, general and administrative expenses in the consolidated statements of income.

Plan assets – German Plan

Plan assets are comprised of Gentherm GmbH’s pension insurance policies and are pledged to the beneficiaries of the German Plan. A market valuation technique, based on observable underlying insurance charges, is used to determine the fair value of the pension plan assets (Level 2).

The expected return on plan assets assumption used to calculate Gentherm GmbH’s pension benefit obligation was determined using actual returns realized on plan assets in the prior year.

Contributions

We do not expect contributions to be paid to the U.S. Plan or the German Plan during the next fiscal year, however, payments to plan participants are expected to be disbursed directly from corporate funds.

The schedule of future expected pension payments is as follows:


	Projected Pension Benefit Payments
Year	U.S Plan		German Plan
2026	$	342	$	291
2027		342		291
2028		342		289
2029		342		1,855
2030		342		380
2031-2035		684		1,821
Total	$	2,394	$	4,927

Defined Contribution Plans

The Company also sponsors defined contribution plans for eligible employees. On a discretionary basis, the Company matches a portion of the employee contributions and or makes additional discretionary contributions. Gentherm recognized costs of $2,257, $2,264 and $2,344 related to contributions to its defined contribution plans during the years ended December 31, 2025, 2024 and 2023, respectively.

- Definition

The entire disclosure for retirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

+ Details

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2025

Income Tax Disclosure [Abstract]

Earnings Before Income Taxes

The income tax provisions were calculated based upon the following components of earnings before income tax for the years ended December 31, 2025, 2024 and 2023:


	Year Ended December 31,
	2025			2024			2023
(Loss) earnings before income tax:
Domestic	$	(104,058	)	$	(54,073	)	$	(37,222	)
Foreign		139,893			156,338			92,176
Earnings before income tax	$	35,835		$	102,265		$	54,954

Provision for Income Taxes

The components of the provision for income taxes for the years ended December 31, 2025, 2024 and 2023 are summarized as follows:


	Year Ended December 31,
	2025			2024			2023
Current income tax expense (benefit):
Federal	$	1,306		$	(1,181	)	$	3,510
State and local		(18	)		679			414
Foreign		38,598			27,240			23,759
Total current income tax expense		39,886			26,738			27,683
Deferred income tax (benefit) expense:
Federal		(10,155	)		(7,944	)		(7,495	)
State and local		2			66			444
Foreign		(12,183	)		18,458			(6,021	)
Total deferred income tax (benefit) expense		(22,336	)		10,580			(13,072	)
Total income tax expense	$	17,550		$	37,318		$	14,611

Deferred Tax Assets and Deferred Tax Liabilities

The deferred tax assets and deferred tax liabilities and related valuation allowance were comprised of the following as of December 31, 2025 and 2024:


	December 31,
	2025			2024
Deferred tax assets:
Net operating losses	$	25,967		$	35,966
Intangible assets		8,711			10,893
Research and development credits		5,920			5,475
Property and equipment		4,779			4,132
Valuation reserves and accrued liabilities		13,872			8,446
Capitalized research and development costs		26,548			28,318
Stock compensation		2,258			2,039
Defined benefit obligation		2,241			1,514
Inventory		1,198			717
Other credits		5,609			—
Unrealized foreign currency exchange losses		6,467			—
Other		14,921			8,707
Total deferred tax asset		118,491			106,207
Valuation allowance		(11,366	)		(25,272	)
Deferred tax liabilities:
Unrealized foreign currency exchange gains	$	(309	)	$	(1,092	)
Undistributed profits of subsidiary		(10,287	)		(5,016	)
Property and equipment		(6,820	)		(10,524	)
Intangible assets		(9,322	)		(8,720	)
Other		(6,663	)		(1,383	)
Total deferred tax liability		(33,401	)		(26,735	)
Net deferred tax asset	$	73,724		$	54,200

Reconciliations Between Statutory Federal Income Tax Rate and Effective Rate

A reconciliation between the statutory Federal income tax rate and the effective rate of income tax expense for the year ended December 31, 2025 is as follows:


	Year Ended December 31,
	2025			Percent of Pre-tax Income
Pre-tax book income	$	35,835
U.S. Federal statutory rate		7,525			21.0	%
State and local income taxes (net of Federal benefit)a		(52	)		(0.2	)%
Foreign tax effects
China
Statutory tax rate difference between China and United States		2,072			5.8	%
Tax rate holiday		(1,747	)		(4.9	)%
R&D super deduction		(2,074	)		(5.8	)%
Withholding taxes		1,650			4.6	%
Other		343			1.0	%
Germany
Statutory tax rate difference between Germany and United States		794			2.2	%
Local Income Taxes		(1,703	)		(4.8	)%
Provision to Return		(1,304	)		(3.6	)%
Tax on Intercompany Distributions		1,891			5.3	%
Other		243			0.7	%
Hungary
Statutory tax rate difference between Hungary and United States		(9,434	)		(26.3	)%
Qualified Domestic Minimum Top-up Tax (QDMTT)		3,319			9.3	%
Local Business Tax & Local Innovation Tax		2,244			6.3	%
Other		(12	)		0.0	%
Korea
Withholding taxes		1,952			5.4	%
Other		(290	)		(0.8	)%
Other foreign jurisdictions		700			2.0	%
Effect of changes in tax laws or rates enacted in the current period		-			0.0	%
Effect of cross-border tax laws
Global Intangible Low-Taxed Income (GILTI)		6,998			19.5	%
Subpart F Income		(401	)		(1.1	)%
Foreign Currency Gain		969			2.7	%
Tax credits - R&D		(1,430	)		(4.0	)%
Changes in valuation allowances		830			2.3	%
Non-taxable / non-deductible items
Stock Options / Executive Compensation		2,505			7.0	%
Transaction Costs		1,257			3.5	%
Changes in unrecognized tax benefits		178			0.5	%
Other adjustments		527			1.4	%
Effective tax rate	$	17,550			49.0	%

(a)

State taxes in Texas for 2025 made up the majority (greater than 50%) of the tax effect in this category.

Reconciliations between the statutory Federal income tax rate and the effective rate of income tax expense for the years ended December 31, 2024 and 2023 are as follows:


	Year Ended December 31,
	2024			2023
Statutory Federal income tax rate		21.0	%		21.0	%
Increase (decrease) resulting from:
Change in valuation allowance		(9.0	)%		(3.1	)%
Effect of different tax rates of foreign jurisdictions		(0.7	)%		0.9	%
Tax credits & deductions related to R&D		(3.7	)%		(8.5	)%
Goodwill impairment		—			4.1	%
Non-deductible expenses		15.7	%		6.8	%
Other foreign, state and local taxes		2.1	%		3.5	%
Tax impact of foreign income		7.5	%		3.6	%
Stock option compensation		1.0	%		—
Audit settlements and statute expirations		11.0	%		—
Incentive tax rates in foreign jurisdictions		(5.5	)%		(1.9	)%
Other		(2.9	)%		0.2	%
Effective rate		36.5	%		26.6	%

Net Operating Loss Carryforwards

The Company has Net Operating Loss (“NOL”) carryforwards as follows:


Jurisdiction	Amount as of December 31, 2025		Years of Expiration
U.S. state income tax	$	43,305	2026-2044
Foreign	$	183,419	Never

Reconciliation of Unrecognized Tax Benefits

The reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:


	Year Ended December 31,
	2025			2024			2023
Balance at beginning of year	$	8,266		$	5,486		$	6,185
Additions based on tax position related to current year		797			78			87
Additions based on tax position related to prior year		40			4,587			347
Reductions from settlements and statute of limitation expiration		(2,132	)		(1,636	)		(1,266	)
Effect of foreign currency translation		749			(249	)		133
Balance at end of year	$	7,720		$	8,266		$	5,486

Schedule of Cash Paid (Received) for Income Taxes, Net of Refunds


	Year ended December 31, 2025
Cash paid (received) for income taxes, net of refunds
Federal	$	687
State and local
Other state and local jurisdictions		(110	)
Foreign
Canada		(2,003	)
China		11,903
Germany		3,337
Hungary		7,676
Korea		3,606
Malta		4,997
Mexico		3,296
Other foreign jurisdictions		3,820
Total Foreign		36,632
Total cash paid for income taxes, net of refunds	$	37,209

Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Earnings Per Share [Abstract]
Net income	$ 18,285	$ 64,947	$ 40,343
Basic weighted average shares of Common Stock outstanding	30,585,443	31,293,113	32,778,055
Dilutive effect of stock options, restricted stock awards and restricted stock units	347,451	183,373	288,862
Diluted weighted average shares of Common Stock outstanding	30,932,894	31,476,486	33,066,917
Basic earnings per share	$ 0.6	$ 2.08	$ 1.23
Diluted earnings per share	$ 0.59	$ 2.06	$ 1.22

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

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+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

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+ Details

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

+ Details

Commitments and Contingencies - Reconciliation of Changes in Accrued Warranty Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Loss Contingency [Abstract]
Balance at beginning of year	$ 3,507	$ 3,945
Warranty claims paid	(9,069)	(6,382)
Warranty expense for products shipped during the current period	11,706	5,812
Adjustments to warranty estimates from prior periods	1,486	247
Adjustments due to currency translation	175	(115)
Balance at end of year	$ 7,805	$ 3,507

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2025

Accounting Policies [Abstract]

Summary of Percentage of Product Revenues and Accounts Receivable

The following is a summary of the percentage of product revenues and accounts receivable from the Company's customers with a percentage of Product Revenues greater than 10 percent:


	Percentage of Total Product Revenues									Percentage of Total Net Accounts Receivable
	Year Ended December 31,									Year Ended December 31,
	2025			2024			2023			2025			2024
Lear		16	%		16	%		15	%		17	%		16	%
Adient		11	%		11	%		13	%		11	%		11	%

Estimated Useful Lives of Property and Equipment

Depreciation is computed using the straight-line method. The estimated useful lives of the Company’s property and equipment are as follows:


Asset Category		Useful Life
Buildings and improvements		1 to 30 years
Machinery and equipment		10 years
Production tooling		2 to 10 years
Leasehold improvements		Term of lease
Information technology		1 to 5 years

Fair Value and Corresponding Useful Lives for Acquired Intangibles Assets

Amortization of other intangible assets is computed using the straight-line method. The useful lives for acquired intangible assets are listed below as follows:


Asset Category		Useful Life
Customer relationships		8 to 15 years
Technology		5 to 12 years
Product development costs		5 to 10 years
Trade names		Indefinite
Software development costs		4 to 5 years

Information Related to Recurring Fair Value Measurement of Derivative Financial Instruments in the Consolidated Balance Sheet (Detail) - Fair Value, Inputs, Level 2 - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Foreign Currency Derivatives \| Derivatives Designated as Cash Flow Hedges
Derivatives Fair Value [Line Items]
Notional Amount	$ 35,122	$ 126,496
Net Asset/ (Liabilities)	4,521	(2,037)
Foreign Currency Derivatives \| Derivatives Designated as Cash Flow Hedges \| Other Current Assets
Derivatives Fair Value [Line Items]
Asset Derivatives, Fair Value	4,521	0
Foreign Currency Derivatives \| Derivatives Designated as Cash Flow Hedges \| Other current liabilities
Derivatives Fair Value [Line Items]
Liability Derivatives, Fair Value		2,037
Interest Rate Contracts \| Derivatives Designated as Cash Flow Hedges
Derivatives Fair Value [Line Items]
Notional Amount	100,000
Net Asset/ (Liabilities)	(775)
Interest Rate Contracts \| Derivatives Designated as Cash Flow Hedges \| Other current liabilities
Derivatives Fair Value [Line Items]
Liability Derivatives, Fair Value	$ 775
Interest Rate Contracts \| Derivatives Not Designated as Hedging Instruments
Derivatives Fair Value [Line Items]
Notional Amount		100,000
Net Asset/ (Liabilities)		719
Interest Rate Contracts \| Derivatives Not Designated as Hedging Instruments \| Other Current Assets
Derivatives Fair Value [Line Items]
Asset Derivatives, Fair Value		$ 719

Supplier Finance Program (Tables)

12 Months Ended

Dec. 31, 2025

Payables and Accruals [Abstract]

Summary of Reconciliation of Changes in Confirmed Obligations to Participating Suppliers

The following is a reconciliation of the changes in confirmed obligations to participating suppliers:


	Year Ended December 31,
	2025			2024
Outstanding at beginning of year	$	21,232		$	—
Invoices confirmed		107,268			90,343
Invoices settled		(105,484	)		(69,111	)
Outstanding at end of year	$	23,016		$	21,232

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Operating Activities:
Net income	$ 18,285	$ 64,947	$ 40,343
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	53,379	52,975	50,948
Deferred income taxes	(22,336)	10,580	(13,072)
Stock based compensation	12,300	10,432	11,627
Provisions for inventory	6,815	6,437	6,867
Loss (gain) on disposition of property and equipment	3,025	(1,603)	721
Impairment of intangible assets and property and equipment		2,501
Impairment of goodwill			19,509
Other non-cash items, including unrealized foreign currency loss (gain)	34,728	(1,156)	2,920
Changes in assets and liabilities:
Accounts receivable, net	(9,300)	(12,077)	(4,195)
Inventory	(21,629)	(34,195)	6,907
Other assets	(17,780)	(44,696)	(26,179)
Accounts payable	27,563	16,222	31,029
Other liabilities	31,741	39,279	(8,160)
Net cash provided by operating activities	116,791	109,646	119,265
Investing Activities:
Purchases of property and equipment	(55,673)	(73,314)	(37,602)
Proceeds from the sale of property and equipment	3,770	7,862	391
Proceeds from deferred purchase price of factored receivables	745	12,876	13,903
Cost of technology investments	(1,240)	(955)	(815)
Net cash used in investing activities	(52,398)	(53,531)	(24,123)
Financing Activities:
Borrowings on debt	112,000	68,000	60,000
Repayments of debt	(143,149)	(70,615)	(72,280)
Proceeds from the exercise of Common Stock options		5,791	263
Taxes withheld and paid on employees' share-based payment awards	(1,319)	(3,296)	(2,940)
Cash paid for the repurchase of Common Stock	(10,015)	(51,585)	(91,094)
Net cash used in financing activities	(42,483)	(51,705)	(106,051)
Foreign currency effect	4,789	(19,949)	6,691
Net cash increase (decrease) in cash and cash equivalents	26,699	(15,539)	(4,218)
Cash and cash equivalents at beginning of period	134,134	149,673	153,891
Cash and cash equivalents at end of period	160,833	134,134	149,673
Supplemental disclosure of cash flow information:
Cash paid for taxes	37,209	20,837	23,273
Cash paid for interest	12,611	13,007	13,242
Non-Cash Investing Activities [Abstract]
Period-end balance of accounts payable for property and equipment	$ 6,053	5,154	7,754
Deferred purchase price of receivables factored in the period		$ 9,276	$ 13,885

Cybersecurity Risk Management, Strategy, and Governance	12 Months Ended
Cybersecurity Risk Management, Strategy, and Governance	Dec. 31, 2025
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]	ITEM 1C. CYBERSECURITY Our corporate information technology, communication networks, enterprise applications, accounting and financial reporting platforms, and related systems are necessary for the operation of our business. We use these systems, among others, to manage our product development and manufacturing, to communicate internally and externally, to operate our accounting and record-keeping functions, and for many other key aspects of our business. Our business operations rely on the secure collection, storage, transmission, and other processing of proprietary, confidential, and sensitive data. Risk Management and Strategy We recognize the importance of assessing, identifying, and managing material risks associated with cybersecurity threats, as such term is defined in Item 106(a) of Regulation S-K. These risks include, among other things: operational risks, intellectual property theft, fraud, extortion, harm to employees or customers, violation of data privacy or security laws, litigation, and legal, financial and reputational risk. We have implemented and maintain various information security processes designed to identify, assess and manage material risks from cybersecurity threats to our critical systems and our proprietary, strategic or competitive data. Depending on the environment, we implement and maintain various technical, physical, and organizational measures, processes, standards, and/or policies designed to manage and mitigate material risks from cybersecurity threats to our information systems and data, including risk assessments, incident detection and response, vulnerability management, disaster recovery and business continuity plans, internal controls within our accounting and financial reporting functions, encryption of data, network security controls, access controls, physical security, asset management, systems monitoring, vendor risk management program and employee training. We conduct regular reviews and tests of our information security program and also leverage audits by our internal audit team, tabletop exercises, penetration and vulnerability testing, and other exercises to evaluate the effectiveness of our information security program and improve our security measures and planning. We have an incident response process that relies on a multidisciplinary team for assessing and managing cybersecurity incidents, including an escalation framework based on the materiality of incidents. The multidisciplinary team includes members of our IT security function, executive management of our legal, finance, human resources, corporate communications and internal audit/risk functions and third party service providers of technical, legal and insurance services, as well as coordination with law enforcement as appropriate. Our IT security function also addresses cybersecurity threats through regular vulnerability reviews, risk registry reviews and global team meetings. Our information security processes are integrated into our overall enterprise risk management (“ERM”) process and system. Our ERM process relies on designated risk managers to identify and assess material risks from cybersecurity threats. The risk managers form a multidisciplinary group including members of our IT security, finance, human resources and legal functions, operations and executive management, and are responsible for timely reporting of risks on an ongoing basis. Our ERM process includes an annual evaluation and ranking of the top risks captured in our ERM system against leading third party benchmark reports on global risks. We work with third parties from time to time that assist us to identify, assess, and manage cybersecurity risks, including professional services firms, consulting firms, threat intelligence service providers, and penetration testing firms. To operate our business, we utilize certain third-party service providers to support a variety of functions. We seek to engage reliable, reputable service providers that maintain cybersecurity programs. Depending on the nature of the services provided, the sensitivity and quantity of information processed, and the identity of the service provider, our vendor management process may include reviewing the cybersecurity practices of such provider, contractually imposing obligations on the provider, conducting security assessments, and conducting periodic reassessments during their engagement. Our systems periodically experience directed attacks that may be intended to lead to financial loss, interruptions and delays in our operations as well as loss, misuse or theft of personal information (of third parties, employees, and other stakeholders) and other data, confidential information or intellectual property. These attacks are increasing in frequency, uniqueness and sophistication to evade detection and remove forensic evidence of the incident, including due to emerging technologies such as artificial intelligence and machine learning, which may cause cybersecurity incidents to be more difficult to detect for periods of time or at all. However, we are not aware of any risks from cybersecurity threats, including as a result of any cybersecurity incidents, which have materially affected or are reasonably likely to materially affect our Company, including our business strategy, results of operations, or financial condition. Refer to “Item 1A. Risk Factors” in this annual report on Form 10-K for additional discussion about cybersecurity-related risks. Governance Our Board of Directors holds oversight responsibility for the Company’s strategy and risk management, including material risks related to cybersecurity threats. This oversight is executed directly by the Board of Directors and through its committees. Our Board members also engage in ad hoc conversations with management on cybersecurity-related news events and discuss any updates to our cybersecurity risk management and strategy programs. The Audit Committee of the Board of Directors (the “Audit Committee”) oversees the quality and effectiveness of the control and enterprise risk management processes of systemic risks, including cybersecurity, in accordance with its charter. The Audit Committee receives reports and engages in regular discussions with management regarding the Company’s significant financial risk exposures and the measures implemented to monitor and reasonably manage these risks, including those that may result from material cybersecurity threats. The Audit Committee also receives reports on material cybersecurity and data privacy incidents (if any), which would include plans to mitigate and respond to such incidents, and status on key information security initiatives. These discussions include the Company’s enterprise risk assessment and risk management policies. The Technology Committee of the Board of Directors oversees the management of risks associated with the Company’s products and technologies, including cybersecurity risks related to new product technologies or significant innovations to existing product technologies, in accordance with its charter. Our Vice President and Chief Information Officer (the “CIO”) leads our global information security organization and reports to the Board of Directors on matters related to cybersecurity on behalf of the Company’s management. Our CIO has over 20 years of industry experience, including serving in similar roles leading and overseeing cybersecurity programs at other public companies. Team members who support our information security program have relevant educational and industry experience, including holding similar positions at large industrial and technology companies. Our CIO leads an internal IT Security Committee that meets regularly to oversee company-wide efforts to address cybersecurity threats, to assess the effectiveness of our information security program and to prioritize efforts to improve our security measures and planning. Our IT Security Committee includes members of our IT security function and executive management of our legal, finance and internal audit/risk, human resources and corporate communications and technology functions.
Cybersecurity Risk Management Processes Integrated [Flag]	true
Cybersecurity Risk Management Processes Integrated [Text Block]	Our information security processes are integrated into our overall enterprise risk management (“ERM”) process and system. Our ERM process relies on designated risk managers to identify and assess material risks from cybersecurity threats.
Cybersecurity Risk Management Third Party Engaged [Flag]	true
Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]	true
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]	false
Cybersecurity Risk Board of Directors Oversight [Text Block]	Governance Our Board of Directors holds oversight responsibility for the Company’s strategy and risk management, including material risks related to cybersecurity threats. This oversight is executed directly by the Board of Directors and through its committees. Our Board members also engage in ad hoc conversations with management on cybersecurity-related news events and discuss any updates to our cybersecurity risk management and strategy programs. The Audit Committee of the Board of Directors (the “Audit Committee”) oversees the quality and effectiveness of the control and enterprise risk management processes of systemic risks, including cybersecurity, in accordance with its charter. The Audit Committee receives reports and engages in regular discussions with management regarding the Company’s significant financial risk exposures and the measures implemented to monitor and reasonably manage these risks, including those that may result from material cybersecurity threats. The Audit Committee also receives reports on material cybersecurity and data privacy incidents (if any), which would include plans to mitigate and respond to such incidents, and status on key information security initiatives. These discussions include the Company’s enterprise risk assessment and risk management policies. The Technology Committee of the Board of Directors oversees the management of risks associated with the Company’s products and technologies, including cybersecurity risks related to new product technologies or significant innovations to existing product technologies, in accordance with its charter. Our Vice President and Chief Information Officer (the “CIO”) leads our global information security organization and reports to the Board of Directors on matters related to cybersecurity on behalf of the Company’s management. Our CIO has over 20 years of industry experience, including serving in similar roles leading and overseeing cybersecurity programs at other public companies. Team members who support our information security program have relevant educational and industry experience, including holding similar positions at large industrial and technology companies. Our CIO leads an internal IT Security Committee that meets regularly to oversee company-wide efforts to address cybersecurity threats, to assess the effectiveness of our information security program and to prioritize efforts to improve our security measures and planning. Our IT Security Committee includes members of our IT security function and executive management of our legal, finance and internal audit/risk, human resources and corporate communications and technology functions.
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]	The Audit Committee of the Board of Directors (the “Audit Committee”) oversees the quality and effectiveness of the control and enterprise risk management processes of systemic risks, including cybersecurity, in accordance with its charter. The Audit Committee receives reports and engages in regular discussions with management regarding the Company’s significant financial risk exposures and the measures implemented to monitor and reasonably manage these risks, including those that may result from material cybersecurity threats. The Audit Committee also receives reports on material cybersecurity and data privacy incidents (if any), which would include plans to mitigate and respond to such incidents, and status on key information security initiatives. These discussions include the Company’s enterprise risk assessment and risk management policies. The Technology Committee of the Board of Directors oversees the management of risks associated with the Company’s products and technologies, including cybersecurity risks related to new product technologies or significant innovations to existing product technologies, in accordance with its charter.
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]	Our Vice President and Chief Information Officer (the “CIO”) leads our global information security organization and reports to the Board of Directors on matters related to cybersecurity on behalf of the Company’s management.
Cybersecurity Risk Role of Management [Text Block]	Risk Management and Strategy We recognize the importance of assessing, identifying, and managing material risks associated with cybersecurity threats, as such term is defined in Item 106(a) of Regulation S-K. These risks include, among other things: operational risks, intellectual property theft, fraud, extortion, harm to employees or customers, violation of data privacy or security laws, litigation, and legal, financial and reputational risk. We have implemented and maintain various information security processes designed to identify, assess and manage material risks from cybersecurity threats to our critical systems and our proprietary, strategic or competitive data. Depending on the environment, we implement and maintain various technical, physical, and organizational measures, processes, standards, and/or policies designed to manage and mitigate material risks from cybersecurity threats to our information systems and data, including risk assessments, incident detection and response, vulnerability management, disaster recovery and business continuity plans, internal controls within our accounting and financial reporting functions, encryption of data, network security controls, access controls, physical security, asset management, systems monitoring, vendor risk management program and employee training. We conduct regular reviews and tests of our information security program and also leverage audits by our internal audit team, tabletop exercises, penetration and vulnerability testing, and other exercises to evaluate the effectiveness of our information security program and improve our security measures and planning. We have an incident response process that relies on a multidisciplinary team for assessing and managing cybersecurity incidents, including an escalation framework based on the materiality of incidents. The multidisciplinary team includes members of our IT security function, executive management of our legal, finance, human resources, corporate communications and internal audit/risk functions and third party service providers of technical, legal and insurance services, as well as coordination with law enforcement as appropriate. Our IT security function also addresses cybersecurity threats through regular vulnerability reviews, risk registry reviews and global team meetings. Our information security processes are integrated into our overall enterprise risk management (“ERM”) process and system. Our ERM process relies on designated risk managers to identify and assess material risks from cybersecurity threats. The risk managers form a multidisciplinary group including members of our IT security, finance, human resources and legal functions, operations and executive management, and are responsible for timely reporting of risks on an ongoing basis. Our ERM process includes an annual evaluation and ranking of the top risks captured in our ERM system against leading third party benchmark reports on global risks. We work with third parties from time to time that assist us to identify, assess, and manage cybersecurity risks, including professional services firms, consulting firms, threat intelligence service providers, and penetration testing firms. To operate our business, we utilize certain third-party service providers to support a variety of functions. We seek to engage reliable, reputable service providers that maintain cybersecurity programs. Depending on the nature of the services provided, the sensitivity and quantity of information processed, and the identity of the service provider, our vendor management process may include reviewing the cybersecurity practices of such provider, contractually imposing obligations on the provider, conducting security assessments, and conducting periodic reassessments during their engagement. Our systems periodically experience directed attacks that may be intended to lead to financial loss, interruptions and delays in our operations as well as loss, misuse or theft of personal information (of third parties, employees, and other stakeholders) and other data, confidential information or intellectual property. These attacks are increasing in frequency, uniqueness and sophistication to evade detection and remove forensic evidence of the incident, including due to emerging technologies such as artificial intelligence and machine learning, which may cause cybersecurity incidents to be more difficult to detect for periods of time or at all. However, we are not aware of any risks from cybersecurity threats, including as a result of any cybersecurity incidents, which have materially affected or are reasonably likely to materially affect our Company, including our business strategy, results of operations, or financial condition. Refer to “Item 1A. Risk Factors” in this annual report on Form 10-K for additional discussion about cybersecurity-related risks.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]	true
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]	Our CIO leads an internal IT Security Committee that meets regularly to oversee company-wide efforts to address cybersecurity threats, to assess the effectiveness of our information security program and to prioritize efforts to improve our security measures and planning.
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]	Our CIO has over 20 years of industry experience, including serving in similar roles leading and overseeing cybersecurity programs at other public companies. Team members who support our information security program have relevant educational and industry experience, including holding similar positions at large industrial and technology companies.
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]	We conduct regular reviews and tests of our information security program and also leverage audits by our internal audit team, tabletop exercises, penetration and vulnerability testing, and other exercises to evaluate the effectiveness of our information security program and improve our security measures and planning. We have an incident response process that relies on a multidisciplinary team for assessing and managing cybersecurity incidents, including an escalation framework based on the materiality of incidents. The multidisciplinary team includes members of our IT security function, executive management of our legal, finance, human resources, corporate communications and internal audit/risk functions and third party service providers of technical, legal and insurance services, as well as coordination with law enforcement as appropriate. Our IT security function also addresses cybersecurity threats through regular vulnerability reviews, risk registry reviews and global team meetings.
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]	true

Accounting for Stock Based Compensation - Summarizes SARs Activity (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2025
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Options Outstanding, beginning balance, Shares	139,684	162,634
Exercised, Shares	(139,684)	(6,450)
Forfeited, Shares		(16,500)
Stock Options Outstanding, ending balance, Shares	0	139,684	162,634
Exercisable, Ending Balance				0
Stock Options Outstanding, beginning balance, Weighted-Average Exercise Price	$ 35.59	$ 36.41
Exercised, Weighted-Average Exercise Price	35.59	40.79
Forfeited, Weighted-Average Exercise Price		41.59
Stock Options Outstanding, ending balance, Weighted-Average Exercise Price	$ 0	$ 35.59	$ 36.41
Exercisable, Weighted Average Exercise Price				$ 0
Exercisable, Weighted-Average Remaining Contractual Term		10 months 24 days	2 years 8 months 4 days
Outstanding, Aggregate Intrinsic Value	$ 0	$ 2,342,000	$ 8,212,000
Exercisable, Aggregate Intrinsic Value				$ 0
Stock Appreciation Rights (SARs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Options Outstanding, beginning balance, Shares	2,250	14,750
Exercised, Shares	(2,250)	(12,500)
Stock Options Outstanding, ending balance, Shares		2,250	14,750
Exercisable, Ending Balance				0
Stock Options Outstanding, beginning balance, Weighted-Average Exercise Price	$ 38.05	$ 38.05
Exercised, Weighted-Average Exercise Price	$ 38.05	38.05
Stock Options Outstanding, ending balance, Weighted-Average Exercise Price		$ 38.05	$ 38.05
Exercisable, Weighted Average Exercise Price				$ 0
Stock Options Outstanding, Weighted-Average Remaining Contractual Term		1 month 24 days	1 year 1 month 24 days
Outstanding, Aggregate Intrinsic Value		$ 32,000	$ 402,000
Exercisable, Aggregate Intrinsic Value				$ 0

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2025	Dec. 31, 2024
Statement of Financial Position [Abstract]
Common Stock, par value
Common Stock, shares authorized	55,000,000	55,000,000
Common Stock, shares issued	30,526,231	30,788,639
Common Stock, shares outstanding	30,526,231	30,788,639

Accounting for Stock Based Compensation - Summarizes Stock Option Activity (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2025
Share-Based Payment Arrangement [Abstract]
Stock Options Outstanding, beginning balance, Shares	139,684	162,634
Exercised, Shares	(139,684)	(6,450)
Forfeited, Shares		(16,500)
Stock Options Outstanding, ending balance, Shares	0	139,684	162,634
Stock Options Exercisable, Shares				0
Stock Options Outstanding, beginning balance, Weighted-Average Exercise Price	$ 35.59	$ 36.41
Exercised, Weighted-Average Exercise Price	35.59	40.79
Forfeited, Weighted-Average Exercise Price		41.59
Stock Options Outstanding, ending balance, Weighted-Average Exercise Price	$ 0	$ 35.59	$ 36.41
Exercisable, Weighted-Average Exercise Price				$ 0
Exercisable, Weighted-Average Remaining Contractual Term		10 months 24 days	2 years 8 months 4 days
Stock Options Outstanding, Aggregate Intrinsic Value	$ 0	$ 2,342,000	$ 8,212,000
Exercisable, Aggregate Intrinsic Value				$ 0

Leases - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2025
Lessee, Lease, Description [Line Items]
Cash proceeds	$ 3,740
Loss on sale	$ 2,311
Minimum
Lessee, Lease, Description [Line Items]
Lessee operating and finance lease remaining term including land		31 years
Lessee operating and finance lease remaining term excluding land		1 year
Maximum
Lessee, Lease, Description [Line Items]
Lessee operating and finance lease remaining term including land		37 years
Lessee operating and finance lease remaining term excluding land		14 years

Segment Reporting - Segment Information About Reported Segment Product Revenues by Product Category (Detail) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2025

Dec. 31, 2024

^[1]

Dec. 31, 2023

Segment Reporting Information [Line Items]

Product revenues

$ 1,498,602

$ 1,456,124

$ 1,469,076

Automotive Segments

Segment Reporting Information [Line Items]

Product revenues

1,448,826

1,406,278

1,422,952

Automotive Segments | Climate Control Seats

Segment Reporting Information [Line Items]

Product revenues

793,314

771,310

797,588

Automotive Segments | Lumbar and Massage Comfort Solutions

Segment Reporting Information [Line Items]

Product revenues

212,182

178,584

144,923

Automotive Segments | Climate Control Interiors

Segment Reporting Information [Line Items]

Product revenues

197,901

186,972

177,976

Automotive Segments | Climate and Comfort Electronics

Segment Reporting Information [Line Items]

Product revenues

29,664

17,363

12,860

Automotive Segments | Automotive Climate and Comfort Solutions

Segment Reporting Information [Line Items]

Product revenues

1,233,061

1,154,229

1,133,347

Automotive Segments | Valve Systems

Segment Reporting Information [Line Items]

Product revenues

96,877

105,056

106,262

Automotive Segments | Other Automotive

Segment Reporting Information [Line Items]

Product revenues

118,888

146,993

183,343

Industrial Segments | Medical

Segment Reporting Information [Line Items]

Product revenues

$ 49,776

$ 49,846

$ 46,124

[1]

Earnings Per Share

12 Months Ended

Dec. 31, 2025

Earnings Per Share [Abstract]

Earnings Per Share

Note 12 — Earnings Per Share

Basic earnings per share are computed by dividing net income by the weighted average number of shares of Common Stock outstanding during the period. The Company’s diluted earnings per share give effect to all potential shares of Common Stock outstanding during a period that do not have an anti-dilutive impact to the calculation. In computing the diluted earnings per share, the treasury stock method is used in determining the number of shares assumed to be issued from the exercise of Common Stock equivalents.

The following table illustrates earnings per share and the weighted average shares outstanding used in calculating basic and diluted earnings per share:


	Year Ended December 31,
	2025		2024		2023
Net income	$	18,285	$	64,947	$	40,343

Basic weighted average shares of Common Stock outstanding		30,585,443		31,293,113		32,778,055
Dilutive effect of stock options, restricted stock awards and restricted stock units		347,451		183,373		288,862
Diluted weighted average shares of Common Stock outstanding		30,932,894		31,476,486		33,066,917

Basic earnings per share	$	0.60	$	2.08	$	1.23
Diluted earnings per share	$	0.59	$	2.06	$	1.22

See Note 17, "Accounting for Stock Based Compensation," for information about the Company’s different equity incentive plans.

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2021
Basis Of Presentation And Accounting Policies [Line Items]
Cash and cash equivalents	$ 160,833	$ 134,134
Capitalized payments to customers	18,168	14,276
Reduction of revenue due to amortization and writeoff of previously capitalized payments	1,634	447	$ 179
Allowance for doubtful accounts	1,600	1,605
Depreciation expense	45,792	45,503	42,186
Investment amount				$ 5,000
Investment made	4,941
Autotech Fund III, L.P.
Basis Of Presentation And Accounting Policies [Line Items]
Investment commitment	2,855
Gain (Loss) on equity method investment	303	0	104
Equity method investments carrying value	$ 2,933	1,540
Capital contribution description	As a limited partner, the Company will periodically make capital contributions toward its total commitment amount over the expected ten-year life of the fund
Automotive Segments
Basis Of Presentation And Accounting Policies [Line Items]
Investment amount	$ 1,463	6,254
Non-cash impairment charges	(4,941)	1,097	$ (2,900)
Production Tooling
Basis Of Presentation And Accounting Policies [Line Items]
Reimbursable tooling capitalized within prepaid expenses and other current assets	23,553	19,740
Foreign Jurisdictions
Basis Of Presentation And Accounting Policies [Line Items]
Cash and cash equivalents	$ 103,135	$ 106,905
Minimum
Basis Of Presentation And Accounting Policies [Line Items]
Period of products expected to be sold	5 years
Minimum \| Production Tooling
Basis Of Presentation And Accounting Policies [Line Items]
Property plant and equipment, estimated useful life	2 years
Maximum
Basis Of Presentation And Accounting Policies [Line Items]
Original maturities of highly liquid investments	90 days
Period of products expected to be sold	10 years
Maximum \| Production Tooling
Basis Of Presentation And Accounting Policies [Line Items]
Property plant and equipment, estimated useful life	10 years
Entities Ownership Interest
Basis Of Presentation And Accounting Policies [Line Items]
Ownership interest	20.00%

Debt - Additional Information (Detail) - USD ($) $ in Thousands		12 Months Ended
	Jun. 10, 2022	Dec. 31, 2025	Dec. 31, 2024
Second Amended and Restated Credit Agreement
Debt Instrument [Line Items]
Debt instrument extended maturity date		Jun. 10, 2027
Remaining borrowing capacity		$ 307,935
Second Amended and Restated Credit Agreement \| Federal Funds Rate
Debt Instrument [Line Items]
Interest rate		0.50%
Second Amended and Restated Credit Agreement \| SOFR Rate
Debt Instrument [Line Items]
Interest rate		1.00%
Term SOFR Rate Loans \| Second Amended and Restated Credit Agreement \| Minimum
Debt Instrument [Line Items]
Interest rate		1.125%
Term SOFR Rate Loans \| Second Amended and Restated Credit Agreement \| Maximum
Debt Instrument [Line Items]
Interest rate		2.125%
Base Rate Loans \| Second Amended and Restated Credit Agreement \| Minimum
Debt Instrument [Line Items]
Interest rate		0.125%
Base Rate Loans \| Second Amended and Restated Credit Agreement \| Maximum
Debt Instrument [Line Items]
Interest rate		1.125%
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity increase subject to specified conditions	$ 200,000
Revolving Credit Facility \| Second Amended and Restated Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity	500,000
Debt issuance cost	1,520
Revolving Credit Facility \| Second Amended and Restated Credit Agreement \| Minimum
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.175%
Revolving Credit Facility \| Second Amended and Restated Credit Agreement \| Maximum
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage		0.30%
Revolving Credit Facility \| Letters of Credit
Debt Instrument [Line Items]
Line of credit, outstanding amount		$ 3,574	$ 2,838
Revolving Credit Facility \| Swing Line Loans
Debt Instrument [Line Items]
Maximum borrowing capacity	50,000
Standby Letters of Credit \| Second Amended and Restated Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 15,000

Equity

12 Months Ended

Dec. 31, 2025

Stockholders' Equity Note [Abstract]

Equity

Note 15 — Equity

Common Stock

The Company is authorized to issue up to 59,991,000 shares, of which 55,000,000 shares shall be Common Stock, without par value, and 4,991,000 shall be Preferred Stock, without par value. As of December 31, 2025, an aggregate of 30,526,231 shares of its

Common Stock were issued and outstanding. As of December 31, 2025, there are no preferred stock shares issued or outstanding. The Common Stock is listed on the Nasdaq Global Select Market under the symbol, “THRM”, and has the following rights and privileges:

▪

Voting rights. All shares of the Common Stock have identical rights and privileges. With limited exceptions, holders of common stock are entitled to one vote for each outstanding share of Common Stock held of record by each shareholder on all matters properly submitted for the vote of the Company’s shareholders.

▪

Dividend rights. Subject to applicable law, any contractual restrictions and the rights of the holders of outstanding preferred stock, if any, holders of Common Stock are entitled to receive ratably such dividends and other distributions that the Company’s Board of Directors, in its discretion, declares from time to time.

▪

Liquidation rights. Upon the dissolution, liquidation or winding up of the Company, subject to the rights of the holders of outstanding preferred stock, if any, holders of Common Stock are entitled to receive ratably the assets of the Company available for distribution to the Company’s shareholders in proportion to the number of shares of Common Stock held by each shareholder.

▪

Conversion, Redemption and Preemptive Rights. Holders of Common Stock have no conversion, redemption, sinking fund, preemptive, subscription or similar rights.

Stock Repurchase Program

In June 2024, the Board of Directors authorized a stock repurchase program (the “2024 Stock Repurchase Program”) to commence upon expiration of the Company’s prior stock repurchase program on June 30, 2024. Under the 2024 Stock Repurchase Program, the Company is authorized to repurchase up to $150,000 of its issued and outstanding Common Stock over a three-year period, expiring June 30, 2027. Repurchases may be made, from time to time, in amounts and at prices the Company deems appropriate, subject to market conditions, applicable legal requirements, debt covenants and other considerations.

Share repurchases and related activity during the years ended December 31, 2025 and 2024 were as follows:


	Year Ended December 31,
	2025		2024
Total number of shares repurchased		381,600		1,019,314
Average price paid per share	$	26.24	$	49.22
Total	$	10,015	$	50,169

Excise tax charged	$	100	$	502

As of December 31, 2025, the 2024 Stock Repurchase Program had $110,103 of share repurchase authorization remaining.

- Definition

The entire disclosure for equity.

+ References

+ Details

Income Taxes

12 Months Ended

Dec. 31, 2025

Income Tax Disclosure [Abstract]

Income Taxes

Note 18 — Income Taxes

The income tax provisions were calculated based upon the following components of earnings before income tax for the years ended December 31, 2025, 2024 and 2023:


	Year Ended December 31,
	2025			2024			2023
(Loss) earnings before income tax:
Domestic	$	(104,058	)	$	(54,073	)	$	(37,222	)
Foreign		139,893			156,338			92,176
Earnings before income tax	$	35,835		$	102,265		$	54,954

The components of the provision for income taxes for the years ended December 31, 2025, 2024 and 2023 are summarized as follows:


	Year Ended December 31,
	2025			2024			2023
Current income tax expense (benefit):
Federal	$	1,306		$	(1,181	)	$	3,510
State and local		(18	)		679			414
Foreign		38,598			27,240			23,759
Total current income tax expense		39,886			26,738			27,683
Deferred income tax (benefit) expense:
Federal		(10,155	)		(7,944	)		(7,495	)
State and local		2			66			444
Foreign		(12,183	)		18,458			(6,021	)
Total deferred income tax (benefit) expense		(22,336	)		10,580			(13,072	)
Total income tax expense	$	17,550		$	37,318		$	14,611

No income taxes have been provided on indefinitely reinvested earnings of certain foreign subsidiaries at December 31, 2025. In addition, deferred U.S. income taxes have not been provided on the undistributed earnings of the Company’s foreign subsidiaries since these earnings will not be taxable upon repatriation to the United States. These earnings will be primarily treated as previously taxed income from either the one-time transition tax or global intangible low-taxed income provision, or they will be offset with a 100% dividend received deduction.

To the extent dividends are paid within foreign tiered subsidiaries, withholding and income taxes may be incurred upon repatriation through the chain. Taxes of $6,963 have been accrued on undistributed earnings that are not indefinitely reinvested and are primarily related to China, Germany, Korea, Ukraine, North Macedonia, Czech Republic and Malta. As of December 31, 2025, taxes have not been provided on $115,705 of undistributed earnings in various subsidiaries as those earnings have been indefinitely invested. If, in the future, these earnings were to be repatriated to foreign affiliates, additional tax provisions would be required. It is not practicable to determine the unrecognized deferred tax liability on these undistributed earnings. There are no other material liabilities for income taxes on the undistributed earnings of foreign subsidiaries, as the Company has concluded that such earnings are either indefinitely reinvested or should not give rise to additional income tax liabilities as a result of the distribution of such earnings.

The deferred tax assets and deferred tax liabilities and related valuation allowance were comprised of the following as of December 31, 2025 and 2024:


	December 31,
	2025			2024
Deferred tax assets:
Net operating losses	$	25,967		$	35,966
Intangible assets		8,711			10,893
Research and development credits		5,920			5,475
Property and equipment		4,779			4,132
Valuation reserves and accrued liabilities		13,872			8,446
Capitalized research and development costs		26,548			28,318
Stock compensation		2,258			2,039
Defined benefit obligation		2,241			1,514
Inventory		1,198			717
Other credits		5,609			—
Unrealized foreign currency exchange losses		6,467			—
Other		14,921			8,707
Total deferred tax asset		118,491			106,207
Valuation allowance		(11,366	)		(25,272	)
Deferred tax liabilities:
Unrealized foreign currency exchange gains	$	(309	)	$	(1,092	)
Undistributed profits of subsidiary		(10,287	)		(5,016	)
Property and equipment		(6,820	)		(10,524	)
Intangible assets		(9,322	)		(8,720	)
Other		(6,663	)		(1,383	)
Total deferred tax liability		(33,401	)		(26,735	)
Net deferred tax asset	$	73,724		$	54,200

A reconciliation between the statutory Federal income tax rate and the effective rate of income tax expense for the year ended December 31, 2025 is as follows:


	Year Ended December 31,
	2025			Percent of Pre-tax Income
Pre-tax book income	$	35,835
U.S. Federal statutory rate		7,525			21.0	%
State and local income taxes (net of Federal benefit)a		(52	)		(0.2	)%
Foreign tax effects
China
Statutory tax rate difference between China and United States		2,072			5.8	%
Tax rate holiday		(1,747	)		(4.9	)%
R&D super deduction		(2,074	)		(5.8	)%
Withholding taxes		1,650			4.6	%
Other		343			1.0	%
Germany
Statutory tax rate difference between Germany and United States		794			2.2	%
Local Income Taxes		(1,703	)		(4.8	)%
Provision to Return		(1,304	)		(3.6	)%
Tax on Intercompany Distributions		1,891			5.3	%
Other		243			0.7	%
Hungary
Statutory tax rate difference between Hungary and United States		(9,434	)		(26.3	)%
Qualified Domestic Minimum Top-up Tax (QDMTT)		3,319			9.3	%
Local Business Tax & Local Innovation Tax		2,244			6.3	%
Other		(12	)		0.0	%
Korea
Withholding taxes		1,952			5.4	%
Other		(290	)		(0.8	)%
Other foreign jurisdictions		700			2.0	%
Effect of changes in tax laws or rates enacted in the current period		-			0.0	%
Effect of cross-border tax laws
Global Intangible Low-Taxed Income (GILTI)		6,998			19.5	%
Subpart F Income		(401	)		(1.1	)%
Foreign Currency Gain		969			2.7	%
Tax credits - R&D		(1,430	)		(4.0	)%
Changes in valuation allowances		830			2.3	%
Non-taxable / non-deductible items
Stock Options / Executive Compensation		2,505			7.0	%
Transaction Costs		1,257			3.5	%
Changes in unrecognized tax benefits		178			0.5	%
Other adjustments		527			1.4	%
Effective tax rate	$	17,550			49.0	%

(a)

State taxes in Texas for 2025 made up the majority (greater than 50%) of the tax effect in this category.

Reconciliations between the statutory Federal income tax rate and the effective rate of income tax expense for the years ended December 31, 2024 and 2023 are as follows:


	Year Ended December 31,
	2024			2023
Statutory Federal income tax rate		21.0	%		21.0	%
Increase (decrease) resulting from:
Change in valuation allowance		(9.0	)%		(3.1	)%
Effect of different tax rates of foreign jurisdictions		(0.7	)%		0.9	%
Tax credits & deductions related to R&D		(3.7	)%		(8.5	)%
Goodwill impairment		—			4.1	%
Non-deductible expenses		15.7	%		6.8	%
Other foreign, state and local taxes		2.1	%		3.5	%
Tax impact of foreign income		7.5	%		3.6	%
Stock option compensation		1.0	%		—
Audit settlements and statute expirations		11.0	%		—
Incentive tax rates in foreign jurisdictions		(5.5	)%		(1.9	)%
Other		(2.9	)%		0.2	%
Effective rate		36.5	%		26.6	%

The Company has Net Operating Loss (“NOL”) carryforwards as follows:


Jurisdiction	Amount as of December 31, 2025		Years of Expiration
U.S. state income tax	$	43,305	2026-2044
Foreign	$	183,419	Never

As of December 31, 2025, the Company has consolidated deferred tax assets of $118,491 with a valuation allowance of $11,366 principally related to tax net operating losses, credit carryforwards and other deferred tax assets on certain U.S. state income tax attributes. The Company has considered historical pre-tax income or loss and the four sources of income in determining the need for a valuation allowance when the realization of its deferred tax assets are not more likely than not. The four sources of income considered are 1) taxable income in prior carryback years where carryback is allowable, 2) future reversals of existing temporary differences, 3) consideration of reasonable and prudent tax planning strategies, and 4) forecasts of future taxable income, exclusive of reversing temporary differences and carryforwards. In the cases where a valuation allowance has been recorded, the evidence described above did not result in a conclusion that the deferred tax assets are more likely than not.

The Company has NOL carryforwards in various states associated with the benefits of the state dividends received reduction and foreign royalty exclusion. The state NOL carryforwards generally expire at various dates from 2026 to 2044. We have concluded that there is not sufficient evidence these NOL carryforwards will be utilized, and thus have not recognized the benefit of these NOL carryforwards as of December 31, 2025.

At December 31, 2025, certain non-U.S. subsidiaries had gross NOL carryforwards totaling $183,419 which have no expiration date. The Company has no valuation allowance recorded against deferred tax assets of $21,442 of the total non-U.S. subsidiaries’ net operating loss carryforwards as of December 31, 2025.

The Company is subject to taxation in the United States and various state and foreign jurisdictions. As of December 31, 2025, the Company was no longer subject to U.S. Federal examinations by tax authorities for tax years before 2021 and was no longer subject to foreign examinations by tax authorities for tax years before 2015.

The Company currently benefits from incentive tax rates in various non-U.S. jurisdictions with expiration dates from 2026 – 2028. Certain of the Company’s Chinese subsidiaries benefit from a reduced corporate income tax rate in 2025 as a result of their

High and New Technology Enterprises status. For the years ended December 31, 2025, 2024 and 2023, income in foreign jurisdictions with such holidays was $17,380, $50,372, and $8,185, respectively.

At December 31, 2025, 2024 and 2023, the Company had total unrecognized tax benefits of $7,720, $8,266 and $5,486, respectively, all of which, if recognized, would affect the effective income tax rates. The reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:


	Year Ended December 31,
	2025			2024			2023
Balance at beginning of year	$	8,266		$	5,486		$	6,185
Additions based on tax position related to current year		797			78			87
Additions based on tax position related to prior year		40			4,587			347
Reductions from settlements and statute of limitation expiration		(2,132	)		(1,636	)		(1,266	)
Effect of foreign currency translation		749			(249	)		133
Balance at end of year	$	7,720		$	8,266		$	5,486

The Company classifies income tax-related penalties and net interest as income tax expense. In the years ended December 31, 2025, 2024 and 2023, income tax related interest and penalties were not material. It is reasonably possible that audit settlements, the conclusions of current examinations or the expiration of the statute of limitations in several jurisdictions could impact the Company’s unrecognized tax benefits.


	Year ended December 31, 2025
Cash paid (received) for income taxes, net of refunds
Federal	$	687
State and local
Other state and local jurisdictions		(110	)
Foreign
Canada		(2,003	)
China		11,903
Germany		3,337
Hungary		7,676
Korea		3,606
Malta		4,997
Mexico		3,296
Other foreign jurisdictions		3,820
Total Foreign		36,632
Total cash paid for income taxes, net of refunds	$	37,209

Cash paid for income taxes, net of refunds, for the periods ended December 31, 2024 and 2023 were $20,837 and $23,273, respectively.

On July 4, 2025, the One Big Beautiful Bill Act (“OBBBA”) was enacted in the U.S. The OBBBA includes significant provisions, such as the permanent extension of certain expiring provisions of the Tax Cuts and Jobs Act, modifications to the international tax framework and the restoration of favorable tax treatment for certain business provisions. The legislation has multiple effective dates, with certain provisions effective in 2025 and others implemented through 2027. OBBBA has not materially impacted the Company's effective tax rate.

In addition, on July 19, 2025, the Act for an Immediate Tax Investment Programme to Strengthen Germany's Business Location (“German Tax Package”) was enacted in Germany. The German Tax Package includes significant provisions, including a gradual reduction in the corporate tax rate from 15% in 2027 to 10% by 2032, in 1% increments beginning in 2028, enhanced depreciation

provisions and expanded relief for research and development expenses. The German Tax Package has not materially impacted the Company’s effective tax rate.

- Definition

The entire disclosure for income tax.

+ References

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+ Details

Goodwill and Other Intangibles - Summary of Changes in the Carrying Amount of Goodwill, By Reportable Segment (Parenthetical) (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Medical Segments
Goodwill [Line Items]
Accumulated impairment losses of goodwill	$ 19,509	$ 19,509

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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+ Details

Summary of Company's Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Total debt	$ 189,073	$ 220,201
Less: current maturities	(73)	(137)
Long-term debt, less current maturities	$ 189,000	$ 220,064
Revolving Credit Facility (U.S. Dollar denominations)
Debt Instrument [Line Items]
Interest Rate	4.95%	5.86%
Total debt	$ 189,000	$ 220,000
Finance Leases
Debt Instrument [Line Items]
Interest Rate	3.34%	3.46%
Total debt	$ 73	$ 201

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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+ Details

Pension and Other Post Retirement Benefit Plans - Components of Net Periodic Benefit Cost for Company's Defined Benefit Plans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
United States
Net periodic benefit cost:
Interest cost	$ 97	$ 101	$ 115
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Selling, General and Administrative Expense	Selling, General and Administrative Expense	Selling, General and Administrative Expense
Net periodic benefit cost	$ 97	$ 101	$ 115
Assumptions:
Discount rate	4.85%	4.45%	4.65%
German Plan
Net periodic benefit cost:
Interest cost	$ 226	$ 234	$ 217
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Selling, General and Administrative Expense	Selling, General and Administrative Expense	Selling, General and Administrative Expense
Expected return on plan assets	$ (153)	$ (130)	$ (115)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax	Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax
Amortization of prior service cost and actuarial loss	$ 78	$ 19	$ 23
Net periodic benefit cost	$ 151	$ 123	$ 125
Assumptions:
Discount rate	3.38%	4.56%	4.10%
Long-term return on assets	3.50%	3.20%	3.20%

Accounting for Stock Based Compensation (Tables)

12 Months Ended

Dec. 31, 2025

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Summary of Recognized and Unrecognized Stock-based Compensation Expense

The total recognized and unrecognized stock based compensation expense is as follows:


Stock Based Compensation Expense	2025		2024			2023			Unrecognized Stock Based Compensation Expense at December 31, 2025		Remaining Weighted Average Vesting Period
RSUs	$	7,420	$	6,871		$	6,216		$	12,891		1.92
PSUs		3,776		2,454			4,661			8,979		1.94
Restricted Stock		1,104		1,115			878			379		0.35
SARs		—		(8	)		(128	)		—		—
Total stock based compensation	$	12,300	$	10,432		$	11,627		$	22,249		1.90

Summary of PSU Activity

The following table summarizes PSU activity during the years ended December 31, 2025, 2024 and 2023:


Unvested Performance Stock Units	Performance Stock Unit Shares			Weighted-Average Grant Date Fair Value
Outstanding at December 31, 2022		320,449		$	62.90
Granted		153,121			65.90
Performance Adjustment		(59,928	)		33.90
Vested		(59,928	)		49.25
Forfeited		(28,737	)		65.97
Outstanding at December 31, 2023		324,977		$	74.10
Granted		235,388			60.68
Performance Adjustment		(52,856	)		79.49
Vested		(27,850	)		92.44
Forfeited		(199,818	)		61.35
Outstanding at December 31, 2024		279,841		$	63.30
Granted		302,762			31.34
Performance Adjustment		(49,103	)		79.46
Vested		(25,303	)		72.44
Forfeited		(14,399	)		48.47
Outstanding at December 31, 2025		493,798		$	43.80

Restricted Stock Activity

The following table summarizes restricted stock activity during the years ended December 31, 2025, 2024 and 2023:


Unvested Restricted Stock	Shares			Weighted-Average Grant Date Fair Value
Outstanding at December 31, 2022		13,600		$	73.54
Granted		17,923			56.96
Vested		(11,900	)		73.54
Forfeited		(1,700	)		73.54
Outstanding at December 31, 2023		17,923		$	56.96
Granted		21,296			50.72
Vested		(17,923	)		56.96
Outstanding at December 31, 2024		21,296		$	50.72
Granted		40,600			26.60
Vested		(21,296	)		50.72
Outstanding at December 31, 2025		40,600		$	26.60

SARs Activity

The following table summarizes SARs activity during the years ended December 31, 2025, 2024 and 2023:


Stock Appreciation Rights	Shares			Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term		Aggregate Intrinsic Value
Outstanding at December 31, 2022		14,750		$	38.05		1.15	$	402
Exercised		(12,500	)		38.05
Outstanding at December 31, 2023		2,250		$	38.05		0.15	$	32
Exercised		(2,250	)		38.05
Outstanding at December 31, 2024		—		$	—		—	$	—
Outstanding at December 31, 2025		—		$	—		—	$	—
Exercisable at December 31, 2025		—		$	—		—	$	—

Summary of Stock Option Activity

The following table summarizes stock option activity during the years ended December 31, 2025, 2024 and 2023:


Options	Shares			Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Term		Aggregate Intrinsic Value
Outstanding at December 31, 2022		162,634		$	36.41		2.68	$	8,212
Exercised		(6,450	)		40.79
Forfeited		(16,500	)	$	41.59
Outstanding at December 31, 2023		139,684		$	35.59		0.90	$	2,342
Exercised		(139,684	)		35.59
Outstanding at December 31, 2024		—		$	—		—	$	—
Outstanding at December 31, 2025		—		$	—		—	$	—
Exercisable at December 31, 2025		—		$	—		—	$	—

RSU

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Restricted Stock Activity

The following table summarizes RSU activity during the years ended December 31, 2025, 2024 and 2023:


Unvested Restricted Stock Units	Time Vesting Shares			Weighted-Average Grant Date Fair Value
Outstanding at December 31, 2022		201,578		$	64.27
Granted		136,964			58.68
Vested		(82,695	)		59.43
Forfeited		(23,986	)		59.47
Outstanding at December 31, 2023		231,861		$	63.19
Granted		184,959			54.20
Vested		(129,477	)		64.55
Forfeited		(84,682	)		57.71
Outstanding at December 31, 2024		202,661		$	56.35
Granted		428,265			31.82
Vested		(87,155	)		57.85
Forfeited		(16,467	)		43.41
Outstanding at December 31, 2025		527,304		$	36.58

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

Segment Reporting

12 Months Ended

Dec. 31, 2025

Segment Reporting [Abstract]

Segment Reporting

Note 19 — Segment Reporting

The Company is organized under two reportable segments: Automotive and Medical.

The Automotive reporting segment is comprised of our global automotive businesses, including the design, development, manufacturing and sales of Automotive Climate and Comfort Solutions (including Climate Control Seats, Climate Control Interiors, Lumbar and Massage Comfort Solutions and Climate and Comfort Electronics), Valve Systems and other automotive products.

The Medical reporting segment is comprised of our patient temperature management business in the medical industry. Patient temperature management includes temperature management systems across multiple product categories addressing the needs of hyper-hypothermia therapy in intensive care, normothermia in surgical procedures and additional warming/cooling therapies utilized in acute and chronic care departments and non-hospital facilities.

The Corporate and other unallocated expenses category includes certain enterprise and governance activities resulting in unallocated corporate costs and other activity and net costs that the Company may choose not to allocate directly to its business segments.

Segment information is used by management, specifically our chief operating decision maker ("CODM"), the President and Chief Executive Officer, for making operating decisions for the Company. Our CODM uses operating income or loss to evaluate the performance and allocate resources for each of the Company’s segments. Operating income or loss is used to monitor budget versus actual results and year-over-year actual results to inform the decisions of how to allocate capital and resources within the Company. The measure of assets has not been disclosed for each segment as it is not regularly reviewed by the CODM.


	Year Ended December 31,
Product Revenues	2025			2024			2023
Automotive	$	1,448,826		$	1,406,278		$	1,422,952
Medical		49,776			49,846			46,124
Total		1,498,602			1,456,124			1,469,076

Significant Segment Expenses and Operating Performance
Automotive
Cost of sales		1,110,222			1,058,989			1,090,941
Net research and development expenses		73,694			68,787			70,778
Selling, general and administrative expenses		67,040			65,924			72,090
Restructuring expenses, net		12,279			12,238			3,187
Loss on sale of land and building, net		2,196			—			—
Automotive operating income		183,395			200,340			185,956

Medical
Cost of sales		26,204			25,868			24,619
Other operating expenses		23,114			21,836			24,230
Impairment of intangible assets and property and equipment		—			2,501			19,509
Medical operating income (loss)		458			(359	)		(22,234	)

Corporate and Other Unallocated Expenses
Corporate and other unallocated expenses		(101,153	)		(92,966	)		(86,283	)
Total consolidated operating income	$	82,700		$	107,015		$	77,439

Other Segment Disclosures
Depreciation and Amortization
Automotive	$	47,701		$	47,752		$	45,845
Medical		3,403			3,542			3,654
Corporate		2,275			1,681			1,449
Total	$	53,379		$	52,975		$	50,948

Automotive and Medical segment product revenues by product category for each of the years ended December 31, 2025, 2024 and 2023 are as follows:


	Year Ended December 31,
	2025		2024 (a)		2023 (a)
Climate Control Seats	$	793,314	$	771,310	$	797,588
Lumbar and Massage Comfort Solutions		212,182		178,584		144,923
Climate Control Interiors		197,901		186,972		177,976
Climate and Comfort Electronics		29,664		17,363		12,860
Automotive Climate and Comfort Solutions		1,233,061		1,154,229		1,133,347
Valve Systems		96,877		105,056		106,262
Other Automotive		118,888		146,993		183,343
Subtotal Automotive segment		1,448,826		1,406,278		1,422,952
Medical segment		49,776		49,846		46,124
Total Company	$	1,498,602	$	1,456,124	$	1,469,076

(a)

Revenue (based on shipment destination) by geographic area for each of the years ended December 31, 2025, 2024 and 2023 is as follows:


	Year Ended December 31,
	2025		2024		2023
United States	$	513,288	$	504,444	$	537,096
China		239,563		224,221		221,512
Germany		113,860		105,927		102,383
Czech Republic		89,648		78,785		69,714
South Korea		89,131		104,120		115,854
Mexico		67,008		43,327		45,733
Slovakia		55,493		55,085		44,946
Romania		54,304		52,616		53,982
Japan		47,601		53,730		60,879
United Kingdom		33,437		41,098		34,765
Other		195,269		192,771		182,212
Total Non-U.S.		985,314		951,680		931,980
Total Company	$	1,498,602	$	1,456,124	$	1,469,076

Property and equipment, net, for each of the geographic areas in which the Company operates as of December 31, 2025 and 2024 is as follows:


	December 31,
Property and equipment, net	2025		2024
Germany	$	50,761	$	42,457
Mexico		50,506		47,814
China		47,414		44,767
United States		40,361		42,928
North Macedonia		29,375		25,374
Vietnam		19,110		20,920
Czech Republic		10,513		9,440
Hungary		8,617		7,994
Ukraine		5,467		5,174
Other		8,490		6,102
Total	$	270,614	$	252,970

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

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+ Details

Restructuring and Impairments - Summary of Restructuring Activity for All Restructuring Initiatives (Detail) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2025

Dec. 31, 2024

Restructuring Cost And Reserve [Line Items]

Balance, beginning of period

$ 3,288

$ 2,150

Additions, charged to restructuring expenses, net

12,832

13,110

Change in estimate

(356)

Cash payments

(9,262)

(10,926)

Non-cash utilization

(138)

(881)

Currency translation and other

564

(165)

Balance, end of period

6,928

3,288

Employee Separation Costs

Restructuring Cost And Reserve [Line Items]

Balance, beginning of period

3,288

2,150

Additions, charged to restructuring expenses, net

9,312

10,896

Change in estimate

(356)

Cash payments

(5,880)

(9,593)

Currency translation and other

564

(165)

Balance, end of period

6,928

3,288

Other Related Costs, Net

Restructuring Cost And Reserve [Line Items]

Additions, charged to restructuring expenses, net

3,520

2,214

^[1]

Cash payments

(3,382)

(1,333)

^[1]

Non-cash utilization

$ (138)

$ (881)

^[1]

[1]	Includes gain on sale of the Greenville facility

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

Goodwill and Other Intangibles - Summary of Changes in the Carrying Amount of Goodwill, By Reportable Segment (Detail) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2025

Dec. 31, 2024

Goodwill [Line Items]

Balance, beginning of period

$ 99,603

Balance, end of period

108,918

$ 99,603

Operating Segments

Goodwill [Line Items]

Balance, beginning of period

99,603

104,073

Currency translation

9,315

(4,470)

Balance, end of period

108,918

99,603

Automotive Segments | Operating Segments

Goodwill [Line Items]

Balance, beginning of period

72,754

76,696

Currency translation

8,277

(3,942)

Balance, end of period

27,887

^[1]

72,754

Medical Segments | Operating Segments

Goodwill [Line Items]

Balance, beginning of period

^[1]

26,849

27,377

Currency translation

^[1]

1,038

(528)

Balance, end of period

$ 81,031

$ 26,849

^[1]

[1]	Includes accumulated impairment losses of $19,509.

- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2025

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Note 2 — Summary of Significant Accounting Policies

Basis of Presentation

The consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”).

Principles of Consolidation

Intercompany transactions and balances between consolidated businesses have been eliminated.

Use of Estimates

Business Combinations

Revenue Recognition

Automotive Revenues

As of December 31, 2025 and 2024, total capitalized payments to customers were $18,168 and $14,276, respectively.

During the years ended December 31, 2025, 2024 and 2023, the Company recognized $1,634, $447 and $179 as reductions of revenue due to amortization and write-off of previously capitalized payments.

The Company has no material contract assets or contract liabilities as of December 31, 2025.

Medical Revenues

Cash and Cash Equivalents

Concentration of Credit Risk

The following is a summary of the percentage of product revenues and accounts receivable from the Company's customers with a percentage of Product Revenues greater than 10 percent:


	Percentage of Total Product Revenues									Percentage of Total Net Accounts Receivable
	Year Ended December 31,									Year Ended December 31,
	2025			2024			2023			2025			2024
Lear		16	%		16	%		15	%		17	%		16	%
Adient		11	%		11	%		13	%		11	%		11	%

Accounts Receivable

Accounts receivable are stated at the invoiced amount, less allowance for doubtful accounts for estimated amounts not expected to be collected, and do not bear interest.

Inventory

Property and Equipment

Depreciation is computed using the straight-line method. The estimated useful lives of the Company’s property and equipment are as follows:


Asset Category		Useful Life
Buildings and improvements		1 to 30 years
Machinery and equipment		10 years
Production tooling		2 to 10 years
Leasehold improvements		Term of lease
Information technology		1 to 5 years

The Company recognized depreciation expense of $45,792, $45,503 and $42,186 for the years ended December 31, 2025, 2024 and 2023, respectively.

Tooling

Goodwill and Other Intangible Assets

Goodwill and other intangible assets recorded in conjunction with business combinations are based on the Company’s estimate of fair value, as of the date of acquisition.

Amortization of other intangible assets is computed using the straight-line method. The useful lives for acquired intangible assets are listed below as follows:


Asset Category		Useful Life
Customer relationships		8 to 15 years
Technology		5 to 12 years
Product development costs		5 to 10 years
Trade names		Indefinite
Software development costs		4 to 5 years

issuance of new patents are expensed as incurred. Such costs are classified as net research and development expenses in the accompanying consolidated statements of income.

Valuation of Long-lived Assets

Impairments of Other Intangible Assets and Goodwill

See Note 6, "Goodwill and Other Intangibles," for additional information about the asset impairment analyses.

Investments in Non-consolidated Affiliates

Research and Development Expenses

Leases

Income Taxes

ultimate settlement with the relevant tax authority. The Company recognizes interest and penalties related to income tax matters in income tax expense.

Derivative Financial Instruments – Hedge Accounting

Earnings per Share

Stock Based Compensation

Goodwill and Other Intangibles - Summary of Estimate of Future Amortization of Other Intangible Assets (Detail) $ in Thousands	Dec. 31, 2025 USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2026	$ 6,859
2027	6,771
2028	6,703
2029	5,963
2030	$ 4,947

Leases

12 Months Ended

Dec. 31, 2025

Leases [Abstract]

Leases

Note 7 — Leases

The Company has operating and finance leases for real estate, office equipment, automobiles, forklifts and certain other equipment. Certain real estate leases are for land which have a remaining lease term of 31 to 37 years, and some of these arrangements have an end date that is at the discretion of the lessee. Excluding land leases, our leases have remaining lease terms ranging from less than one year to fourteen years and may include options to extend the lease. We do not have lease arrangements with related parties.

Components of lease expense for the years ended December 31, 2025, 2024 and 2023 were as follows:


	Year Ended December 31,
	2025		2024		2023
Lease cost:
Operating lease cost	$	13,739	$	10,747	$	9,606
Amortization of finance leases		161		370		390
Interest on lease liabilities - finance leases		5		14		28
Short-term lease cost		3,999		3,684		2,651
Total lease cost	$	17,904	$	14,815	$	12,675

Other information related to leases is as follows:


	Year Ended December 31,
	2025		2024
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$	12,992	$	10,428
Operating cash flows for finance leases		5		14
Financing cash flows for finance leases		149		383
Right-of-use lease assets obtained in exchange for lease obligations:
Operating leases	$	19,364	$	30,720

	December 31, 2025		December 31, 2024
Weighted average remaining lease term:
Operating leases	9.62 yrs		9.3 years
Finance leases	0.50 yrs		1.5 years
Weighted average discount rate:
Operating leases	6.22%			6.09	%
Finance leases	3.34%			3.46	%

A summary of future lease payments for non-cancellable operating leases with terms exceeding one year, as of December 31, 2025, is as follows:


2026	$	12,113
2027		8,828
2028		7,330
2029		6,520
2030		6,224
2031 or later		37,041
Total future minimum lease payments		78,056
Less imputed interest		(20,305	)
Total	$	57,751

A summary of future lease payments for non-cancellable finance leases with terms exceeding one year, as of December 31, 2025, is as follows:


2026	$	73
Total	$	73

During the first quarter of 2025, the Company completed a move to a new corporate headquarters building in Novi, Michigan. In connection with the move we completed the sale of our former headquarters building in Northville, Michigan in January 2025. The sale resulted in cash proceeds of $3,740 and a loss on sale of $2,311.

Accounting for Stock Based Compensation - Summarizes Restricted Stock Activity (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Outstanding at beginning of period, Shares	21,296	17,923	13,600
Granted, Shares	40,600	21,296	17,923
Vested, Shares	(21,296)	(17,923)	(11,900)
Forfeited, Shares			(1,700)
Outstanding at end of period, Shares	40,600	21,296	17,923
Outstanding at beginning of period, Weighted-Average Grant Date Fair Value	$ 50.72	$ 56.96	$ 73.54
Granted, Weighted-Average Grant Date Fair Value	26.6	50.72	56.96
Vested, Weighted-Average Grant Date Fair Value	50.72	56.96	73.54
Forfeited, Weighted-Average Grant Date Fair Value			73.54
Outstanding at end of period, Weighted-Average Grant Date Fair Value	$ 26.6	$ 50.72	$ 56.96

Information Related to Effect of Derivative Instruments in the Consolidated Statements of Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Total foreign currency derivatives	$ 11,388	$ (7,542)	$ 12,113
Interest Rate Contracts
Derivative Instruments Gain Loss [Line Items]
Total foreign currency derivatives	(543)
Other comprehensive (loss) income \| Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Total foreign currency derivatives	8,505	(11,259)	3,483
Other comprehensive (loss) income \| Interest Rate Contracts
Derivative Instruments Gain Loss [Line Items]
Total foreign currency derivatives	(775)
Derivatives Not Designated as Hedging Instruments \| Interest Rate Contracts
Derivative Instruments Gain Loss [Line Items]
Total interest rate derivatives	(719)	(1,343)	(710)
Cost of sales - income \| Foreign Currency Derivatives
Derivative Instruments Gain Loss [Line Items]
Total foreign currency derivatives	2,883	3,717	8,630
Interest Expense, Net \| Interest Rate Contracts
Derivative Instruments Gain Loss [Line Items]
Total foreign currency derivatives	232
Interest Expense, Net \| Derivatives Not Designated as Hedging Instruments \| Interest Rate Contracts
Derivative Instruments Gain Loss [Line Items]
Total interest rate derivatives	$ (719)	$ (1,343)	$ (710)

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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-Topic 815
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-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E

+ Details

Financial Instruments - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Interest Rate Swap
Derivative [Line Items]
Hedge Ineffectiveness Incurred	$ 0	$ 0	$ 0