Net Loss Per Share - Schedule of Anti-Dilutive Securities Excluded from Computation of Earnings Per Share (Detail) - shares |
3 Months Ended | |
|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
|
| Options [Member] | ||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Anti-dilutive securities excluded from computation of earnings per share | 620,312 | 952,422 |
| Unvested Restricted Stock [Member] | ||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Anti-dilutive securities excluded from computation of earnings per share | 685,719 | 551,499 |
| Unvested Restricted Stock Units [Member] | ||
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Anti-dilutive securities excluded from computation of earnings per share | 64,024 | 59,582 |