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Commitments and Contingencies - Additional Information (Detail)	Feb. 14, 2024 Vehicle
Loss Contingency [Abstract]
Number of vehicles recalled	261,257

X

- Definition

Number of vehicles recalled.

+ References

No definition available.

+ Details

Name:	thrm_NumberOfVehiclesRecalled
Namespace Prefix:	thrm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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