Debt - Summary of Future Principal Amounts Payable (Detail) $ in Thousands |
Dec. 31, 2015
USD ($)
|
|---|---|
| Debt Disclosure [Abstract] | |
| Future principal amounts payable, 2016 | $ 1,995 |
| Future principal amounts payable, 2017 | 1,711 |
| Future principal amounts payable, 2018 | 722 |
| Future principal amounts payable, Total | $ 4,428 |