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Financial Instruments - Summary of Trade Receivables Sold and Factoring Fees Incurred (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Trade receivables sold	$ 38,540
Factoring fees incurred	$ 161

X

- Definition

Factoring fees.

+ References

No definition available.

+ Details

Name:	thrm_FactoringFees
Namespace Prefix:	thrm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Proceeds from securitizations of receivables treated as collateralized borrowings, which are classified as financing transactions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration