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Series C Convertible Preferred Stock Installments (Detail) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Sep. 30, 2013
Class Of Stock [Line Items] |
Dividend, installment payments | $ 696
Principal, installment payments | 8,446
Total, installment payments | $ 9,142

X
- Definition Dividend installment payments. + References No definition available. + Details
Name: | thrm_DividendInstallmentPayments
Namespace Prefix: | thrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Net of dividend and principal installment payments. + References No definition available. + Details
Name: | thrm_NetOfDividendAndPrincipalInstallmentPayments
Namespace Prefix: | thrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Preferred stock principal paid in installments. + References No definition available. + Details
Name: | thrm_PreferredStockPrincipalPaidInInstallments
Namespace Prefix: | thrm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_ClassOfStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration