Stock-Based Awards - Schedule of Stock Option Activity (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] |
|
|
| Shares Issuable Under Options, Beginning balance |
1,611,991
|
|
| Shares Issuable Under Options, Granted |
680,231
|
|
| Shares Issuable Under Options, Exercised |
(141,848)
|
|
| Shares Issuable Under Options, Forfeited |
(34,855)
|
|
| Shares Issuable Under Options, Ending balance |
2,115,519
|
1,611,991
|
| Shares Issuable Under Options, Vested and expected to vest |
2,078,345
|
|
| Shares Issuable Under Options, Exercisable |
1,064,373
|
|
| Weighted Average Exercise Price, Beginning balance |
$ 5.24
|
|
| Weighted Average Exercise Price, Granted |
28.47
|
|
| Weighted Average Exercise Price, Exercised |
1.46
|
|
| Weighted Average Exercise Price, Forfeited |
16.61
|
|
| Weighted Average Exercise Price, Ending balance |
12.78
|
$ 5.24
|
| Weighted Average Exercise Price, Vested and expected to vest |
12.57
|
|
| Weighted Average Exercise Price, Exercisable |
$ 7.05
|
|
| Weighted Average Remaining Contractual Term, Beginning balance |
6 years 10 months 24 days
|
6 years 6 months
|
| Weighted Average Remaining Contractual Term, Vested and Expected to vest |
6 years 10 months 2 days
|
|
| Weighted Average Remaining Contractual Term, Exercisable |
5 years 8 months 12 days
|
|
| Aggregate Intrinsic Value, Beginning balance |
$ 29,464
|
|
| Aggregate Intrinsic Value, Ending balance |
5,897
|
$ 29,464
|
| Aggregate Intrinsic Value, Vested and Expected to vest |
5,872
|
|
| Aggregate Intrinsic Value, Exercisable |
$ 4,984
|
|