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Financial Instruments - Summary of Receivables Factored and Availability Under Receivables Factoring Agreements (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Receivables factored and outstanding | [1] | $ 755 | $ 18,532
[1] | During the year ended December 31, 2024, the factoring agreements the Company was party to either expired or were terminated. As of December 31, 2024 there were remaining receivables factored and outstanding that will be collected in the future, however, no further factoring can occur under these factoring agreements.

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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

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