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Fair Value Measurement - Additional Information (Detail) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022
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Fair Value, Recurring Basis |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Financial assets, fair value | $ 0 | $ 0
Financial liabilities, fair value | 0 | 0
Fair Value, Nonrecurring Basis |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Financial assets, fair value | 0 | 0
Financial liabilities, fair value | $ 0 | $ 0

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- Definition Financial assets fair value disclosure. + References No definition available. + Details
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Namespace Prefix: | thrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- 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

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- Definition Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities. + References No definition available. + Details
Name: | us-gaap_FinancialLiabilitiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |