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Loan Agreements - Summary of Minimum Future Principal Payments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Disclosure [Abstract]    
2015 $ 3,321us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths  
Unamortized discount relating to warrants (197)us-gaap_DebtInstrumentUnamortizedDiscount  
Total 3,124us-gaap_LoansPayable  
Less current portion (3,124)us-gaap_LoansPayableCurrent (3,134)us-gaap_LoansPayableCurrent
Long-term portion   $ 3,124us-gaap_LongTermLoansPayable