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Pension and Other Post Retirement Benefit Plans - Summary of Accumulated Benefit Obligations (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
United States
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 2,331	$ 2,602
German Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 6,281	$ 5,406

X

- Definition

Defined benefit plan accumulated benefit obligation net.

+ References

No definition available.

+ Details

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Namespace Prefix:	thrm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RetirementPlanSponsorLocationAxis=us-gaap_ForeignPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: