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Net Operating Loss Carryforwards (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
U.S. Federal and state income tax  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforward, amount 49,978us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= thrm_FederalAndStateJurisdictionMember
U.S. Federal and state income tax | Minimum  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforward, year of expiration 2018
U.S. Federal and state income tax | Maximum  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforward, year of expiration 2034
Foreign  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforward, amount 4,090us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
Foreign | Minimum  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforward, year of expiration 2018
Foreign | Maximum  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforward, year of expiration 2019
Indefinite  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforward, amount 9,074us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= thrm_ForeignCountryIndefiniteMember
Operating loss carryforward, year of expiration Indefinite