Stockholders' Equity - Summary of Stock Option Activity And Weighted Average Exercise Prices (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands |
12 Months Ended |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
| Options |
|
|
|
| Options outstanding, beginning balance (in shares) |
9,144
|
10,769
|
9,724
|
| Granted (in shares) |
635
|
857
|
3,827
|
| Exercised (in shares) |
(325)
|
(646)
|
(1,098)
|
| Cancelled or expired (in shares) |
(1,685)
|
(1,837)
|
(1,684)
|
| Options outstanding, ending balance (in shares) |
7,769
|
9,144
|
10,769
|
| Options vested and expected to vest |
7,348
|
8,356
|
9,043
|
| Options exercisable |
5,580
|
5,401
|
4,737
|
| Weighted Average Exercise Price |
|
|
|
| Options outstanding, beginning balance (in dollars per share) |
$ 11.05
|
$ 10.95
|
$ 10.86
|
| Granted (in dollars per share) |
7.32
|
10.06
|
11.04
|
| Exercised (in dollars per share) |
5.66
|
4.41
|
7.10
|
| Cancelled (in dollars per share) |
11.49
|
12.22
|
12.70
|
| Options outstanding, ending balance (in dollars per share) |
10.88
|
11.05
|
10.95
|
| Options vested and expected to vest (in dollars per share) |
11.00
|
11.08
|
10.89
|
| Options exercisable (in dollars per share) |
$ 11.31
|
$ 10.95
|
$ 10.01
|
| Weighted Average Remaining Contractual Term (in years) |
|
|
|
| Options outstanding |
6 years 18 days
|
6 years 7 months 28 days
|
7 years 4 days
|
| Options vested and expected to vest |
5 years 10 months 24 days
|
6 years 5 months 27 days
|
6 years 8 months 9 days
|
| Options exercisable |
5 years 3 months 7 days
|
5 years 7 months 6 days
|
5 years 3 months 11 days
|
| Aggregate Intrinsic Value |
|
|
|
| Options outstanding |
$ 2,641
|
$ 2,117
|
$ 38,752
|
| Options vested and expected to vest |
2,529
|
2,117
|
33,566
|
| Options exercisable |
$ 2,347
|
$ 2,117
|
$ 22,083
|