Annual report pursuant to Section 13 and 15(d)

Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail)

v2.4.1.9
Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Tax provision at statutory rate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State taxes, net of federal benefit 5.03%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 5.09%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Permanent differences (0.47%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (1.19%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Tax Credits 3.37%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits 4.20%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCredits
Other 0.21%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 7.47%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Decrease in valuation reserve (42.14%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (49.57%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Total 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations