Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands |
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 Options, Granted |
1,078,000
|
774,000
|
884,000
|
| 2014 Equity Incentive Plan [Member] |
|
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
|
| Number of Options, Outstanding at December 31, 2015 |
1,658,408
|
|
|
| Number of Options, Granted |
1,078,000
|
|
|
| Number of Options, Exercised |
(42,000)
|
|
|
| Number of Options, Expired |
(32,499)
|
|
|
| Number of Options, Forfeited |
(113,501)
|
|
|
| Number of Options, Outstanding at December 31, 2016 |
2,548,408
|
1,658,408
|
|
| Number of Options, Outstanding, Weighted average remaining contractual life as of December 31, 2016 |
8 years 2 months 5 days
|
|
|
| Number of Options, Options exercisable at December 31, 2016 |
1,007,334
|
|
|
| Number of Options, Exercisable, Weighted average remaining contractual life as of December 31, 2016 |
6 years 11 months 16 days
|
|
|
| Number of Options, Options vested and expected to vest at December 31, 2016 |
2,417,327
|
|
|
| Number of Options, Vested and expected to vest, Weighted average remaining contractual life as of December 31, 2016 |
8 years 1 month 10 days
|
|
|
| Weighted-Average Exercise Price, Outstanding at December 31, 2015 |
$ 10.27
|
|
|
| Weighted-Average Exercise Price, Granted |
6.55
|
|
|
| Weighted-Average Exercise Price, Exercised |
2.93
|
|
|
| Weighted-Average Exercise Price, Expired |
11.03
|
|
|
| Weighted-Average Exercise Price, Forfeited |
11.52
|
|
|
| Weighted-Average Exercise Price, Outstanding at December 31, 2016 |
8.75
|
$ 10.27
|
|
| Weighted-Average Exercise Price, Options exercisable at December 31, 2016 |
9.26
|
|
|
| Weighted-Average Exercise Price, Options vested and expected to vest at December 31, 2016 |
$ 8.76
|
|
|
| Aggregate Intrinsic Value, Outstanding at December 31, 2016 |
$ 4,144
|
|
|
| Aggregate Intrinsic Value, Options exercisable at December 31, 2016 |
1,461
|
|
|
| Aggregate Intrinsic Value, Options vested and expected to vest at December 31, 2016 |
$ 3,929
|
|
|