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Loan Agreements - Summary of Minimum Future Principal Payments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Disclosure [Abstract]    
2016 $ 7,945  
2017 8,544  
2018 4,511  
Unamortized discount relating to warrants and deferred financing costs (676)  
Total 20,324  
Less current portion (7,652) $ (3,124)
Long-term portion $ 12,672