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Assets and Liabilities Held for Sale - Summary of Assets and Liabilities of Disposal Group Classified as Held for Sale (Detail) (Parenthetical) $ in Thousands | Sep. 30, 2018 USD ($)
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Discontinued Operations And Disposal Groups [Abstract] |
Allowance for accounts receivable | $ 89

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- Definition Allowance for doubtful accounts discontinued operations. + References No definition available. + Details
Name: | thrm_AllowanceForDoubtfulAccountsDiscontinuedOperations
Namespace Prefix: | thrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration