New Accounting Pronouncements (Policies)	6 Months Ended
Jun. 30, 2026
Accounting Policies [Abstract]
Basis of Presentation and Significant Accounting Policies	Basis of Presentation and Significant Accounting Policies The unaudited consolidated condensed financial statements included herein have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information and pursuant to the rules and regulations of the U.S. Securities and Exchange Commission. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to those rules and regulations. The information furnished in the consolidated condensed financial statements include all adjustments (consisting of only normal, recurring adjustments) considered necessary to present fairly the results of operations, financial position and cash flows of the Company. These financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2025. The operating results for interim periods are not necessarily indicative of results that may be expected for other interim periods or for the full year. In preparing these 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 third-party sources, as appropriate. These estimates and assumptions are subject to an inherent degree of uncertainty and may change 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. All amounts in these notes to the consolidated condensed financial statements are presented in thousands, except share and per share data.
Principles of Consolidation	Principles of Consolidation The consolidated condensed 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 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.
Revenue Recognition - payments to customers	Revenue Recognition - payments to customers 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 June 30, 2026 and December 31, 2025, total capitalized payments to customers were $22,142 and $18,168, respectively. During the three and six months ended June 30, 2026, the Company recognized $541 and $975 as reductions of revenue due to amortization and write-off of previously capitalized payments. During the three and six months ended June 30, 2025, the Company recognized $208 and $1,044 as reductions of revenue due to amortization and write-off of previously capitalized payments. The Company had no other material contract assets or contract liabilities as of June 30, 2026
Loss on Sale of Land and Building, net	Loss on Sale of Land and Building, net In January 2025, we completed the sale of our former headquarters building in Northville, Michigan for cash proceeds of $3,740. As a result, the Company recognized a loss on sale of $2,311 during the six months ended June 30, 2025.
Disaggregation of Income Statement Expenses	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	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.
Environmental Credits and Environmental Credit Obligations	Environmental Credits and Environmental Credit Obligations In May 2026, the FASB issued ASU 2026-02, “Environmental Credits and Environmental Credit Obligations (Topic 818)”. ASU 2026-02 provides recognition, measurement, presentation, and disclosure requirements for all entities that generate, purchase, or receive environmental credits or have a regulatory compliance obligation that may be settled with environmental credits. 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 2026-02 will have on the Company’s financial statement disclosures.

New Accounting Pronouncements (Policies)

6 Months Ended

Jun. 30, 2026

Basis of Presentation and Significant Accounting Policies

The unaudited consolidated condensed financial statements included herein have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information and pursuant to the rules and regulations of the U.S. Securities and Exchange Commission. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to those rules and regulations. The information furnished in the consolidated condensed financial statements include all adjustments (consisting of only normal, recurring adjustments) considered necessary to present fairly the results of operations, financial position and cash flows of the Company. These financial statements should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2025. The operating results for interim periods are not necessarily indicative of results that may be expected for other interim periods or for the full year.

In preparing these 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 third-party sources, as appropriate. These estimates and assumptions are subject to an inherent degree of uncertainty and may change 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.

All amounts in these notes to the consolidated condensed financial statements are presented in thousands, except share and per share data.

Principles of Consolidation

The consolidated condensed 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 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.

Revenue Recognition - payments to customers

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 June 30, 2026 and December 31, 2025, total capitalized payments to customers were $22,142 and $18,168, respectively.

During the three and six months ended June 30, 2026, the Company recognized $541 and $975 as reductions of revenue due to amortization and write-off of previously capitalized payments. During the three and six months ended June 30, 2025, the Company recognized $208 and $1,044 as reductions of revenue due to amortization and write-off of previously capitalized payments.

The Company had no other material contract assets or contract liabilities as of June 30, 2026

Loss on Sale of Land and Building, net

In January 2025, we completed the sale of our former headquarters building in Northville, Michigan for cash proceeds of $3,740. As a result, the Company recognized a loss on sale of $2,311 during the six months ended June 30, 2025.

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.

Environmental Credits and Environmental Credit Obligations

In May 2026, the FASB issued ASU 2026-02, “Environmental Credits and Environmental Credit Obligations (Topic 818)”. ASU 2026-02 provides recognition, measurement, presentation, and disclosure requirements for all entities that generate, purchase, or receive environmental credits or have a regulatory compliance obligation that may be settled with environmental credits. 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 2026-02 will have on the Company’s financial statement disclosures.