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Financial Instruments - Summary of Receivables Factored and Availability Under Receivables Factoring Agreements (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Receivables factored and outstanding | $ 18,532 | $ 19,108
Amount available under the credit limit | 5,891 | 5,034
Maximum Limits for Accounts Receivable Factoring Arrangements, Total | $ 24,423 | $ 24,142

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- Definition Amount available under credit limit. + References No definition available. + Details
Name: | thrm_AmountAvailableUnderCreditLimit
Namespace Prefix: | thrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Factoring receivables not yet paid. + References No definition available. + Details
Name: | thrm_FactoringReceivablesNotYetPaid
Namespace Prefix: | thrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Maximum limits for accounts receivable factoring arrangements. + References No definition available. + Details
Name: | thrm_MaximumLimitsForAccountsReceivableFactoringArrangements
Namespace Prefix: | thrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration