Stock-based Awards - Schedule of Stock Option Activity (Details)
$ / shares in Units, $ in Millions |
12 Months Ended |
|
Dec. 31, 2015
USD ($)
$ / shares
shares
|
Dec. 31, 2014
$ / shares
shares
|
| Number of Options |
|
|
| Outstanding at the beginning of period (in shares) |
|
|
| Outstanding at the end of the period (in shares) |
24,277,901
|
|
| Options to Purchase Common Stock |
|
|
| Number of Options |
|
|
| Outstanding at the beginning of period (in shares) |
25,589,876
|
|
| Granted (in shares) |
4,983,099
|
|
| Exercised (in shares) |
(1,724,604)
|
|
| Canceled/forfeited (in shares) |
(4,570,470)
|
|
| Outstanding at the end of the period (in shares) |
24,277,901
|
25,589,876
|
| Vested and expected to vest at the end of the period (in shares) |
23,741,347
|
|
| Exercisable at the end of the period (in shares) |
16,674,660
|
|
| Weighted-Average Exercise Price |
|
|
| Outstanding at the beginning of period (in dollars per share) | $ / shares |
$ 9.79
|
|
| Granted (in dollars per share) | $ / shares |
9.98
|
|
| Exercised (in dollars per share) | $ / shares |
3.67
|
|
| Canceled/forfeited (in dollars per share) | $ / shares |
21.19
|
|
| Outstanding at the end of the period (in dollars per share) | $ / shares |
8.12
|
$ 9.79
|
| Vested and expected to vest at the end of the period (in dollars per share) | $ / shares |
8.08
|
|
| Exercisable at the end of the period (in dollars per share) | $ / shares |
$ 7.01
|
|
| Weighted-Average Remaining Contractual Life |
|
|
| Outstanding at the end of the period |
5 years 7 months 13 days
|
7 years 6 months 18 days
|
| Vested and expected to vest at the end of the period |
5 years 6 months 15 days
|
|
| Exercisable at the end of the period |
4 years 2 months 19 days
|
|
| Aggregate Intrinsic Value |
|
|
| Intrinsic value of all outstanding options | $ |
$ 63.2
|
|
| Intrinsic value of options vested and expected to vest | $ |
62.4
|
|
| Intrinsic value of exercisable options | $ |
$ 55.5
|
|