Equity Compensation (Activity) (Details) - Stock options - $ / shares
|
|
3 Months Ended |
|
Jan. 01, 2019 |
Mar. 31, 2019 |
Jun. 11, 2013 |
| Shares Subject to Options Outstanding |
|
|
|
| Balance at the beginning of the period (in shares) |
1,081,212
|
1,081,212
|
|
| Exercised (in shares) |
|
(32,010)
|
|
| Expired (in shares) |
|
(2,626)
|
|
| Forfeited (in shares) |
|
(1,336)
|
|
| Balance at the end of the period (in shares) |
|
1,045,240
|
|
| Exercisable options (in shares) |
|
1,010,354
|
|
| Vested and expected to vest at the end of the period (in shares) |
|
1,045,240
|
|
| Weighted Average Exercise Price |
|
|
|
| Balance at the beginning of the period (in dollars per share) |
$ 12.98
|
$ 12.98
|
|
| Exercised (in dollars per share) |
|
9.70
|
|
| Expired (in dollars per share) |
|
16.96
|
|
| Forfeited (in dollars per share) |
|
7.28
|
|
| Balance at the end of the period (in dollars per share) |
|
13.08
|
|
| Exercisable options at the end of the period (in dollars per share) |
|
13.21
|
|
| Vested and expected to vest (in dollars per share) |
|
$ 13.08
|
|
| Weighted-Average Remaining Contractual Life |
|
|
|
| Exercisable options |
|
4 years 4 months 24 days
|
|
| Vested and expected to vest |
|
4 years 4 months 24 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%
|
| Increase in number of shares authorized for issuance |
1,325,845
|
|
|