Stock Based Awards - Summary of Restricted Stock Activity (Detail) - $ / shares |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |||
| Number of Shares, Granted | 332,964 | 123,450 | 185,514 |
| Restricted stock units [Member] | |||
| Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | |||
| Number of Shares, Unvested beginning balance | 254,067 | ||
| Number of Shares, Granted | 332,964 | ||
| Number of Shares, Vested | (79,756) | ||
| Number of Shares, Forfeited/canceled | (5,248) | ||
| Number of Shares, Unvested ending balance | 502,027 | 254,067 | |
| Weighted Average Grant-Date Fair Value, Unvested beginning balance | $ 21.11 | ||
| Weighted Average Grant Date Fair Value, Granted | 10.63 | ||
| Weighted Average Grant Date Fair Value, Vested | 14.64 | ||
| Weighted Average Grant Date Fair Value, Forfeited/canceled | 21.71 | ||
| Weighted Average Grant Date Fair Value, Unvested ending balance | $ 14.43 | $ 21.11 | |