Stock-based Compensation - Restricted Stock Awards - Activity (Details) - Restricted Stock Awards - $ / shares |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Awards | |||
| Unvested at the beginning of the period (in shares) | 67,380 | ||
| Granted (in shares) | 139,825 | ||
| Vested (in shares) | (67,380) | ||
| Unvested at the end of the period (in shares) | 139,825 | 67,380 | |
| Weighted Average Grant Date Fair Value per Share | |||
| Unvested at the beginning of the period (in dollars per share) | $ 7.30 | ||
| Granted (in dollars per share) | 4.00 | $ 7.30 | $ 18.77 |
| Vested (in dollars per share) | 7.30 | ||
| Unvested at the end of the period (in dollars per share) | $ 4.00 | $ 7.30 | |