Summary of Stock Options Activity (Detail)
$ / shares in Units, $ in Thousands |
9 Months Ended |
|
Sep. 30, 2016
USD ($)
$ / shares
shares
|
|---|
| Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
|
| Beginning Balance, Number of Options Outstanding | shares |
5,360,257
|
| Number of Options, Granted | shares |
1,829,537
|
| Number of Options, Exercised | shares |
(139,396)
|
| Number of Options, Forfeited | shares |
(1,309,127)
|
| Ending Balance, Number of Options Outstanding | shares |
5,741,271
|
| Number of Options, Vested and expected to vest at September 30, 2016 | shares |
5,351,476
|
| Number of Options, Exercisable at September 30, 2016 | shares |
2,954,077
|
| Beginning Balance, Weighted Average Exercise Price | $ / shares |
$ 51.53
|
| Granted, Weighted Average Exercise Price | $ / shares |
21.85
|
| Exercised, Weighted Average Exercise Price | $ / shares |
7.85
|
| Forfeited, Weighted Average Exercise Price | $ / shares |
54.27
|
| Ending Balance, Weighted Average Exercise Price | $ / shares |
42.51
|
| Vested and expected to vest, Weighted Average Exercise Price | $ / shares |
42.80
|
| Exercisable, Weighted Average Exercise Price | $ / shares |
$ 43.14
|
| Outstanding, Weighted Average Remaining Contractual Term (Years) |
7 years 4 months 24 days
|
| Vested and expected to vest, Weighted Average Remaining Contractual Term (Years) |
7 years 2 months 12 days
|
| Exercisable, Weighted Average Remaining Contractual Term (Years) |
5 years 9 months 18 days
|
| Outstanding, Aggregate Intrinsic Value | $ |
$ 52,392
|
| Vested and expected to vest, Aggregate Intrinsic Value | $ |
48,604
|
| Exercisable, Aggregate Intrinsic Value | $ |
$ 27,713
|