Equity Compensation (Activity) (Details) - Stock options - $ / shares
|
12 Months Ended |
|
Dec. 31, 2015 |
Dec. 31, 2014 |
Jun. 11, 2013 |
| Shares Subject to Options Outstanding |
|
|
|
| Balance at the beginning of the period (in shares) |
4,851,221
|
4,905,214
|
|
| Granted (in shares) |
238,516
|
1,592,268
|
|
| Exercised (in shares) |
(285,387)
|
(1,512,514)
|
|
| Expired (in shares) |
(47,866)
|
(136)
|
|
| Forfeited (in shares) |
(183,812)
|
(133,611)
|
|
| Balance at the end of the period (in shares) |
4,572,672
|
4,851,221
|
|
| Exercisable options (in shares) |
3,185,180
|
2,494,711
|
|
| Vested and expected to vest at the end of the period (in shares) |
4,466,655
|
4,615,485
|
|
| Weighted Average Grant Date Fair Value |
|
|
|
| Granted (in dollars per share) |
$ 5.310
|
$ 9.99
|
|
| Weighted Average Exercise Price |
|
|
|
| Balance at the beginning of the period (in dollars per share) |
10.57
|
6.31
|
|
| Granted (in dollars per share) |
10.52
|
18.00
|
|
| Exercised (in dollars per share) |
4.87
|
4.24
|
|
| Expired (in dollars per share) |
13.92
|
7.40
|
|
| Forfeited (in dollars per share) |
14.76
|
13.77
|
|
| Balance at the end of the period (in dollars per share) |
10.72
|
10.57
|
|
| Exercisable options at the end of the period (in dollars per share) |
8.76
|
6.33
|
|
| Vested and expected to vest (in dollars per share) |
$ 10.61
|
$ 10.30
|
|
| Weighted-Average Remaining Contractual Life |
|
|
|
| Exercisable options |
5 years 2 months 12 days
|
5 years 7 months 6 days
|
|
| Vested and expected to vest |
6 years 1 month 6 days
|
7 years
|
|
| 2013 Plan |
|
|
|
| Stock options |
|
|
|
| Annual increase in shares authorized for issuance as a percentage of shares outstanding as of the preceding December 31 |
|
|
5.00%
|