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Income Taxes - Components of Provision (Benefit) for Income Taxes by Taxing Authority (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Current provision:    
Federal $ 0us-gaap_CurrentFederalTaxExpenseBenefit $ 0us-gaap_CurrentFederalTaxExpenseBenefit
Foreign 0us-gaap_CurrentForeignTaxExpenseBenefit 0us-gaap_CurrentForeignTaxExpenseBenefit
States 0us-gaap_CurrentStateAndLocalTaxExpenseBenefit 141us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total current provision 0us-gaap_CurrentIncomeTaxExpenseBenefit 141us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred provision (benefit):    
Federal (309)us-gaap_DeferredFederalIncomeTaxExpenseBenefit 536us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Foreign 0us-gaap_DeferredForeignIncomeTaxExpenseBenefit 0us-gaap_DeferredForeignIncomeTaxExpenseBenefit
States (25)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 36us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total deferred provision (benefit): (334)us-gaap_DeferredIncomeTaxExpenseBenefit 572us-gaap_DeferredIncomeTaxExpenseBenefit
Total provision (benefit) for income taxes $ (334)us-gaap_IncomeTaxExpenseBenefit $ 713us-gaap_IncomeTaxExpenseBenefit