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 |