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Subsequent Events - Additional Information (Detail) - Subsequent Events - Alfmeier € in Thousands	May 04, 2022 EUR (€)
Subsequent Event [Line Items]
Acquisition of shares, net of cash and debt	€ 177,500
Working capital adjustment	€ 4,000

X

- Definition

Acquisition of shares, net of cash and debt.

+ References

No definition available.

+ Details

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

X

- Definition

Working capital adjustment.

+ References

No definition available.

+ Details

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

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=thrm_AlfmeierMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: