Stock Based Awards - Summary of Stock Options Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands |
12 Months Ended |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
| Shares Available for Grant |
|
|
|
| Shares Available for Grant, Beginning balance |
1,350,543
|
991,401
|
9,533
|
| Shares Available for Grant, Additional shares authorized |
1,323,911
|
1,091,045
|
2,531,915
|
| Shares Available for Grant, Options granted |
(1,399,522)
|
(664,100)
|
(1,471,142)
|
| Shares Available for Grant, Restricted stock units granted |
(332,964)
|
(123,450)
|
(185,514)
|
| Shares Available for Grant, Options cancelled |
102,145
|
55,647
|
106,609
|
| Shares Available for Grant, Ending balance |
1,044,113
|
1,350,543
|
991,401
|
| Number of shares |
|
|
|
| Number of Shares, Beginning balance |
3,240,969
|
2,723,367
|
1,403,656
|
| Number of Shares, Options granted |
1,399,522
|
664,100
|
1,471,142
|
| Number of Shares, Options exercised |
(85,646)
|
(90,851)
|
(44,822)
|
| Number of Shares, Options cancelled |
(102,145)
|
(55,647)
|
(106,609)
|
| Number of Shares, Ending balance |
4,452,700
|
3,240,969
|
2,723,367
|
| Number of Shares, Vested and expected to vest |
4,323,511
|
|
|
| Number of Shares, Exercisable |
2,246,742
|
|
|
| Weighted Average Exercise Price |
|
|
|
| Weighted Average Exercise Price, Beginning balance |
$ 11.51
|
$ 10.33
|
$ 1.90
|
| Weighted Average Exercise Price, Options granted |
10.04
|
15.34
|
18.68
|
| Weighted Average Exercise Price, Options exercised |
1.64
|
1.34
|
1.32
|
| Weighted Average Exercise Price, Options cancelled |
14.90
|
15.68
|
18.43
|
| Weighted Average Exercise Price, Ending balance |
11.16
|
$ 11.51
|
$ 10.33
|
| Weighted Average Exercise Price, Vested and expected to vest |
11.14
|
|
|
| Weighted Average Exercise Price, Exercisable |
$ 10.11
|
|
|
| Weighted Average Remaining Contractual Life (in years) |
|
|
|
| Weighted Average Remaining Contractual Life, Options outstanding |
7 years 9 months 18 days
|
|
|
| Weighted Average Remaining Contractual Life, Vested and expected to vest |
7 years 9 months 18 days
|
|
|
| Weighted Average Remaining Contractual Life, Exercisable |
7 years 2 months 12 days
|
|
|
| Aggregate Intrinsic Value, Options outstanding |
$ 25,162
|
|
|
| Aggregate Intrinsic Value, Vested and expected to vest |
24,632
|
|
|
| Aggregate Intrinsic Value, Exercisable |
$ 15,498
|
|
|