New Accounting Pronouncements (Policies)	3 Months Ended
Mar. 31, 2024
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, 2023. 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. 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. 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 (“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.
Variable Interest Entities	Variable Interest Entities The Company maintains an ownership interest in a VIE, Carrar Ltd. (“Carrar”). Carrar is a technology developer of advanced thermal management systems for the electric mobility market. The Company determined that Carrar is a VIE; however, the Company does not have a controlling financial interest or have the power to direct the activities that most significantly affect the economic performance of the investment. Therefore, the Company has concluded that it is not the primary beneficiary. Gentherm’s investment in Carrar is measured at cost, less impairments, adjusted for observable price changes in orderly transactions for identical or similar investments of the same issuer. In the first quarter of 2024, we recognized an increase in the fair value of our investment in Carrar of $1,097 in Other income in the consolidated condensed statements of income due to observable transactions. The Carrar investment was $3,897 and $2,800 as of March 31, 2024 and December 31, 2023, respectively, and is recorded in Other non-current assets in the consolidated condensed balance sheets.
Revenue Recognition	Revenue Recognition The Company has no material contract assets or contract liabilities as of March 31, 2024. The Company recognizes an asset for the incremental costs of obtaining a contract with a customer if the benefits of those costs are expected to be realized for a period greater than one year. Total capitalized costs to obtain a contract were $10,945 and $7,305 as of March 31, 2024 and December 31, 2023, respectively. These amounts are recorded in Other non-current assets in the consolidated condensed balance sheets and are being amortized into Product revenues in the consolidated condensed statements of income over the expected production life of the applicable program.
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements The Company considers the applicability and impact of all Accounting Standards Updates ("ASUs") issued by the Financial Accounting Standards Board. New ASUs effective in 2023 were assessed and determined to be either not applicable or not expected to have a significant impact on the Company's consolidated condensed financial statements.
Recently Issued Accounting Pronouncements Not Yet Adopted	Recently Issued Accounting Pronouncements Not Yet Adopted Segment Reporting In November 2023, the FASB issued ASU 2023-07, "Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures". ASU 2023-07 requires a public entity to disclose, on an annual and interim basis, significant segment expenses that are included within each reported measure of segment profit or loss and regularly reviewed by the chief operating decision maker ("CODM"), the title and position of the CODM, clarification regarding the CODM's use of multiple measures of a segment's profit or loss in assessing segment performance (this must include a measure that is consistent with the measurement principles under U.S. GAAP, but may also include additional measures of a segment's profit or loss), and a description of the composition of amounts within an "Other" segment line item. Further, ASU 2023-07 requires that all annual disclosures about a reportable segment's profit or loss and assets currently required by Topic 280 to be provided in interim periods. This update is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. ASU 2023-07 should be adopted retrospectively to all periods presented in the financial statements and early adoption is permitted. We are currently in the process of determining the impact the implementation of ASU 2023-07 will have on the Company’s financial statement disclosures. 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. Further, early adoption is permitted. We are currently in the process of determining the impact the implementation of ASU 2023-09 will have on the Company’s financial statement disclosures.

New Accounting Pronouncements (Policies)

3 Months Ended

Mar. 31, 2024

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, 2023. 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. 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.

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 (“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.

Variable Interest Entities

The Company maintains an ownership interest in a VIE, Carrar Ltd. (“Carrar”). Carrar is a technology developer of advanced thermal management systems for the electric mobility market. The Company determined that Carrar is a VIE; however, the Company does not have a controlling financial interest or have the power to direct the activities that most significantly affect the economic performance of the investment. Therefore, the Company has concluded that it is not the primary beneficiary. Gentherm’s investment in Carrar is measured at cost, less impairments, adjusted for observable price changes in orderly transactions for identical or similar investments of the same issuer. In the first quarter of 2024, we recognized an increase in the fair value of our investment in Carrar of $1,097 in Other income in the consolidated condensed statements of income due to observable transactions. The Carrar investment was $3,897 and $2,800 as of March 31, 2024 and December 31, 2023, respectively, and is recorded in Other non-current assets in the consolidated condensed balance sheets.

Revenue Recognition

The Company has no material contract assets or contract liabilities as of March 31, 2024.

The Company recognizes an asset for the incremental costs of obtaining a contract with a customer if the benefits of those costs are expected to be realized for a period greater than one year. Total capitalized costs to obtain a contract were $10,945 and $7,305 as of March 31, 2024 and December 31, 2023, respectively. These amounts are recorded in Other non-current assets in the consolidated condensed balance sheets and are being amortized into Product revenues in the consolidated condensed statements of income over the expected production life of the applicable program.

Recently Adopted Accounting Pronouncements

The Company considers the applicability and impact of all Accounting Standards Updates ("ASUs") issued by the Financial Accounting Standards Board. New ASUs effective in 2023 were assessed and determined to be either not applicable or not expected to have a significant impact on the Company's consolidated condensed financial statements.

Recently Issued Accounting Pronouncements Not Yet Adopted

Segment Reporting

In November 2023, the FASB issued ASU 2023-07, "Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures". ASU 2023-07 requires a public entity to disclose, on an annual and interim basis, significant segment expenses that are included within each reported measure of segment profit or loss and regularly reviewed by the chief operating decision maker ("CODM"), the title and position of the CODM, clarification regarding the CODM's use of multiple measures of a segment's profit or loss in assessing segment performance (this must include a measure that is consistent with the measurement principles under U.S. GAAP, but may also include additional measures of a segment's profit or loss), and a description of the composition of amounts within an "Other" segment line item. Further, ASU 2023-07 requires that all annual disclosures about a reportable segment's profit or loss and assets currently required by Topic 280 to be provided in interim periods. This update is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. ASU 2023-07 should be adopted retrospectively to all periods presented in the financial statements and early adoption is permitted. We are currently in the process of determining the impact the implementation of ASU 2023-07 will have on the Company’s financial statement disclosures.

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. Further, early adoption is permitted. We are currently in the process of determining the impact the implementation of ASU 2023-09 will have on the Company’s financial statement disclosures.