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Income Taxes - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2010 | Dec. 31, 2011
Income Taxes [Line Items] |  |  |  |  |
Statutory Federal income tax rate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate |  |
Deductions taken for tax purposes on stock option exercises | $ 1,831 thrm_UnrecordedTaxBenefitFromStockOptionsExercised | $ 2,074 thrm_UnrecordedTaxBenefitFromStockOptionsExercised |  |  |
Stock option exercises included in net operating loss carryforwards | 7,075 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 3,599 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |  |  |
Tax benefit due to a change in tax law |  | 1,300 us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate |  |  |
Total unrecognized tax benefits | 4,651 us-gaap_UnrecognizedTaxBenefits | 2,241 us-gaap_UnrecognizedTaxBenefits | 2,191 us-gaap_UnrecognizedTaxBenefits |  | 1,678 us-gaap_UnrecognizedTaxBenefits
Preferred Financing |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating loss carryforward annual limitation | 591 thrm_NetOperatingLossCarryforwardAnnualLimitation / us-gaap_IncomeTaxAuthorityAxis = thrm_ChangeInControlOneMember |  |  |  |
Net operating loss carryforward expected to expire | 6,025 thrm_NetOperatingLossCarryforwardExpectedToExpire / us-gaap_IncomeTaxAuthorityAxis = thrm_ChangeInControlOneMember |  |  |  |
Net operating loss expired | 13,324 thrm_NetOperatingLossExpirationAmount / us-gaap_IncomeTaxAuthorityAxis = thrm_ChangeInControlOneMember |  |  |  |
Net operating loss additional amount utilizable |  |  |  | 4,044 thrm_NetOperatingLossAdditionalAmountUtilizable / us-gaap_IncomeTaxAuthorityAxis = thrm_ChangeInControlOneMember |
U.S. Federal |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Stock option exercises included in net operating loss carryforwards | $ 21,856 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember |  |  |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=37586315&loc=d3e32059-109318 + Details
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