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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Basis Of Presentation And Accounting Policies [Line Items] |  |  |  |  |
Amortization of capitalized costs into product revenues |  | $ 447,000 | $ 179,000 |  |
Cash and cash equivalents |  | 134,134,000 | 149,673,000 |  |
Capitalized payments to customers |  | 14,276,000 | 7,305,000 |  |
Capitalized cost, impairment loss |  | 0 |  |  |
Allowance for doubtful accounts |  | 1,605,000 | 1,171,000 |  |
Depreciation expense |  | 45,503,000 | 42,186,000 | $ 33,730,000 |
Investment amount |  | 3,897,000 |  |  | $ 5,200,000
Investment made | $ 500,000 | 1,097,000 |  |  |
Non-cash impairment charges |  |  | 2,900,000 |  |
Forciot Oy | Gentherm Automotive Segment |  |  |  |  |
Basis Of Presentation And Accounting Policies [Line Items] |  |  |  |  |
Investment amount |  |  |  |  | 2,357,000
Autotech Fund III, L.P. |  |  |  |  |
Basis Of Presentation And Accounting Policies [Line Items] |  |  |  |  |
Investment commitment |  | $ 1,765,000 |  |  | $ 5,000,000
Capital contribution description |  | As a limited partner, the Company will periodically make capital contributions toward this total commitment amount over the expected ten-year life of the fund. |  |  |
Production Tooling |  |  |  |  |
Basis Of Presentation And Accounting Policies [Line Items] |  |  |  |  |
Reimbursable tooling capitalized within prepaid expenses and other current assets |  | $ 19,740,000 | 16,877,000 |  |
Foreign Jurisdictions |  |  |  |  |
Basis Of Presentation And Accounting Policies [Line Items] |  |  |  |  |
Cash and cash equivalents |  | $ 106,905,000 | $ 125,251,000 |  |
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% |  |  |

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