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Financial Instruments - Summary of Receivables Factored and Availability Under Receivables Factoring Agreements (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Receivables factored and outstanding	$ 21,034	$ 19,108
Amount available under the credit limit	3,321	5,034
Collective factoring limit	$ 24,355	$ 24,142

X

- 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

X

- 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