Stock-Based Compensation - Summary of Stock Option Activity Under the 2012 and 2013 Plans (Detail) - USD ($)
$ / shares in Units, $ in Thousands |
12 Months Ended |
Dec. 31, 2015 |
Dec. 31, 2014 |
| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
|
|
| Number of Options, Outstanding Beginning Balance |
537,683
|
|
| Number of Options, Granted |
914,722
|
|
| Number of Options, Exercised |
(53,458)
|
|
| Number of Options, Cancelled |
(176,180)
|
|
| Number of Options, Outstanding Ending Balance |
1,222,767
|
537,683
|
| Number of Options, Vested and expected to vest outstanding |
1,133,925
|
451,153
|
| Number of Options, Exercisable |
318,733
|
139,798
|
| Weighted Average Exercise Price, Outstanding Beginning Balance |
$ 6.19
|
|
| Weighted Average Exercise Price, Granted |
7.74
|
|
| Weighted Average Exercise Price, Exercised |
0.76
|
|
| Weighted Average Exercise Price, Cancelled |
8.13
|
|
| Weighted Average Exercise Price, Outstanding Ending Balance |
7.31
|
$ 6.19
|
| Weighted Average Exercise Price, Vested and expected to vest outstanding |
7.29
|
5.83
|
| Weighted Average Exercise Price, Exercisable |
$ 4.60
|
$ 1.84
|
| Weighted Average Remaining Contractual Term, Outstanding |
9 years
|
8 years 10 months 24 days
|
| Weighted Average Remaining Contractual Term, Vested and expected to vest outstanding |
9 years
|
8 years 10 months 24 days
|
| Weighted Average Remaining Contractual Term, Exercisable |
7 years 7 months 6 days
|
8 years 1 month 6 days
|
| Aggregate Intrinsic Value, Outstanding |
$ 4,679
|
$ 2,488
|
| Aggregate Intrinsic Value, Vested and expected to vest outstanding |
4,293
|
2,247
|
| Aggregate Intrinsic Value, Exercisable |
$ 351
|
$ 1,239
|