Net Loss per Share - Antidilutive (Details) - shares |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
|
| Restricted Stock Units | ||||
| Potential dilutive securities that would have been anti-dilutive | ||||
| Potential dilutive securities that would have been anti-dilutive due to net loss (in shares) | 1,280,627 | 1,355,393 | 1,280,627 | 1,355,393 |
| Stock options | ||||
| Potential dilutive securities that would have been anti-dilutive | ||||
| Potential dilutive securities that would have been anti-dilutive due to net loss (in shares) | 4,659,638 | 5,095,909 | 4,659,638 | 5,095,909 |