Equity Compensation (Activity) (Details) - Stock options - $ / shares
|
3 Months Ended |
9 Months Ended |
|
Sep. 30, 2016 |
Sep. 30, 2016 |
Jun. 11, 2013 |
| Shares Subject to Options Outstanding |
|
|
|
| Balance at the beginning of the period (in shares) |
|
4,572,672
|
|
| Granted (in shares) |
0
|
50,000
|
|
| Exercised (in shares) |
|
(619,757)
|
|
| Expired (in shares) |
|
(69,832)
|
|
| Forfeited (in shares) |
|
(51,588)
|
|
| Balance at the end of the period (in shares) |
3,881,495
|
3,881,495
|
|
| Exercisable options (in shares) |
2,990,429
|
2,990,429
|
|
| Vested and expected to vest at the end of the period (in shares) |
3,822,911
|
3,822,911
|
|
| Weighted Average Grant Date Fair Value |
|
|
|
| Granted (in dollars per share) |
|
$ 4.63
|
|
| Weighted Average Exercise Price |
|
|
|
| Balance at the beginning of the period (in dollars per share) |
|
10.72
|
|
| Granted (in dollars per share) |
|
8.16
|
|
| Exercised (in dollars per share) |
|
4.87
|
|
| Expired (in dollars per share) |
|
14.79
|
|
| Forfeited (in dollars per share) |
|
15.68
|
|
| Balance at the end of the period (in dollars per share) |
$ 11.48
|
11.48
|
|
| Exercisable options at the end of the period (in dollars per share) |
10.41
|
10.41
|
|
| Vested and expected to vest (in dollars per share) |
$ 11.44
|
$ 11.44
|
|
| Weighted-Average Remaining Contractual Life |
|
|
|
| Exercisable options |
|
5 years 7 months 6 days
|
|
| Vested and expected to vest |
|
6 years 1 month 6 days
|
|
| 2013 Plan |
|
|
|
| Stock options |
|
|
|
| Potential annual increase in shares authorized for issuance as a percentage of shares outstanding as of the preceding December 31 |
|
|
5.00%
|