Income Taxes - Components of Loss Before Income Taxes (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Income Tax Disclosure [Abstract] | |||
| United States | $ (43,020) | $ (32,937) | $ (18,892) |
| Foreign | (6,341) | 689 | 189 |
| Loss before income taxes | $ (49,361) | $ (32,248) | $ (18,703) |