Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Accounting Policies [Abstract] | ||
| Payroll | $ 1,495 | $ 660 |
| Professional fees | 952 | 610 |
| Clinical studies | 835 | |
| Other | 876 | 648 |
| Total | $ 4,158 | $ 1,918 |