XML 45 R35.htm IDEA: XBRL DOCUMENT v3.24.1.u1

Overview - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Investment amount	$ 3,897	$ 2,800
Increase in the fair value of investment	1,097
Capitalized costs to obtain contract	$ 10,945	$ 7,305
Entities Ownership Interest
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Ownership interest	20.00%
Minimum
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Expected period of costs to be realized to recognize assets	1 year

X

- Definition

Expected period of costs to be realized to recognize assets.

+ References

No definition available.

+ Details

Name:	thrm_ExpectedPeriodOfCostsToBeRealizedToRecognizeAssets
Namespace Prefix:	thrm_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Investment company increase in fair value of investment from observable transaction.

+ References

No definition available.

+ Details

Name:	thrm_InvestmentCompanyIncreaseInFairValueOfInvestmentFromObservableTransaction
Namespace Prefix:	thrm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Organization, consolidation and presentation of financial statements.

+ References

No definition available.

+ Details

Name:	thrm_OrganizationConsolidationAndPresentationOfFinancialStatementsLineItems
Namespace Prefix:	thrm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 340
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479483/340-40-50-3

+ Details

Name:	us-gaap_CapitalizedContractCostNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481687/323-10-50-3

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Portion of equity (net assets) in a variable interest entity (VIE) not attributable, directly or indirectly, to the parent entity. That is, this is the portion of equity in a VIE that is attributable to the noncontrolling interest (previously referred to as minority interest).

+ References

No definition available.

+ Details

Name:	us-gaap_NoncontrollingInterestInVariableInterestEntity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=thrm_EntitiesOwnershipInterestMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: