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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%