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Income Taxes - Company Recorded Income Tax Provision (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current:      
Federal $ 0us-gaap_CurrentFederalTaxExpenseBenefit $ 0us-gaap_CurrentFederalTaxExpenseBenefit $ 0us-gaap_CurrentFederalTaxExpenseBenefit
State 0us-gaap_CurrentStateAndLocalTaxExpenseBenefit 0us-gaap_CurrentStateAndLocalTaxExpenseBenefit 0us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total 0us-gaap_CurrentIncomeTaxExpenseBenefit 0us-gaap_CurrentIncomeTaxExpenseBenefit 0us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:      
Federal 0us-gaap_DeferredFederalIncomeTaxExpenseBenefit 0us-gaap_DeferredFederalIncomeTaxExpenseBenefit 0us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State 0us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 0us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 0us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total $ 0us-gaap_DeferredIncomeTaxExpenseBenefit $ 0us-gaap_DeferredIncomeTaxExpenseBenefit $ 0us-gaap_DeferredIncomeTaxExpenseBenefit