Equity Compensation (Activity) (Details) - Stock options - $ / shares
|
|
6 Months Ended |
|
Jan. 01, 2015 |
Jun. 30, 2015 |
Jun. 11, 2013 |
| Shares Subject to Options Outstanding |
|
|
|
| Balance at the beginning of the period (in shares) |
4,851,221
|
4,851,221
|
|
| Granted (in shares) |
|
166,916
|
|
| Exercised (in shares) |
|
(151,776)
|
|
| Expired (in shares) |
|
(5,364)
|
|
| Forfeited (in shares) |
|
(38,736)
|
|
| Balance at the end of the period (in shares) |
|
4,822,261
|
|
| Exercisable options (in shares) |
|
2,856,014
|
|
| Vested and expected to vest at the end of the period (in shares) |
|
4,666,097
|
|
| Weighted Average Grant Date Fair Value |
|
|
|
| Granted (in dollars per share) |
|
$ 5.88
|
|
| Weighted Average Exercise Price |
|
|
|
| Balance at the beginning of the period (in dollars per share) |
$ 10.57
|
10.57
|
|
| Granted (in dollars per share) |
|
11.64
|
|
| Exercised (in dollars per share) |
|
4.89
|
|
| Expired (in dollars per share) |
|
11.82
|
|
| Forfeited (in dollars per share) |
|
13.92
|
|
| Balance at the end of the period (in dollars per share) |
|
10.76
|
|
| Exercisable options at the end of the period (in dollars per share) |
|
7.84
|
|
| Vested and expected to vest (in dollars per share) |
|
$ 10.59
|
|
| Weighted-Average Remaining Contractual Life |
|
|
|
| Exercisable options |
|
5 years 7 months 6 days
|
|
| Vested and expected to vest |
|
6 years 8 months 12 days
|
|
| 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%
|
| Increase in number of shares authorized for issuance |
1,215,269
|
|
|