Stock-Based Compensation - Restricted Stock Units (Details) - Restricted Stock Units |
12 Months Ended |
|---|---|
|
Dec. 31, 2016
USD ($)
$ / shares
shares
| |
| Restricted Stock Units | |
| Granted (in shares) | shares | 163,784 |
| Cancelled (in shares) | shares | (4,138) |
| Unvested at end of year (in shares) | shares | 159,646 |
| Weighted-Average Grant Date Fair Value | |
| Granted (in dollars per share) | $ / shares | $ 17.30 |
| Cancelled (in dollars per share) | $ / shares | 26.33 |
| Unvested at the end of year (in dollars per share) | $ / shares | $ 17.07 |
| Unrecognized compensation cost | $ | $ 2,234,847 |
| Weighted-average period expected to be recognized | 3 years 1 month 6 days |