|
Stock Based Compensation (Stock Option Activity) (Details) (Stock Options [Member], USD $)
In Thousands, except Share data, unless otherwise specified
|
3 Months Ended |
12 Months Ended |
|
Mar. 31, 2014
|
Dec. 31, 2013
|
|
Stock Options [Member]
|
|
|
| Shares Available for Grant |
|
|
| Shares available for grant |
762,867 |
|
| Stock options granted |
(35,000) |
|
| Stock options cancelled |
61,802 |
|
| Shares available for grant |
789,669 |
762,867 |
| Stock Options Outstanding |
|
|
| Beginning balance, options |
1,909,769 |
|
| Stock options granted |
(35,000) |
|
| Stock options cancelled |
(67,785) |
|
| Stock options exercised |
(223,478) |
|
| Ending balance, options |
1,653,506 |
1,909,769 |
| Stock options vested and expected to vest |
1,498,651 |
|
| Stock options exercisable |
218,856 |
|
| Weighted-average Exercise Price Per Share |
|
|
| Weighted-average exercise price, options outstanding |
$ 8.77 |
|
| Grants in period |
$ 12.29 |
|
| Cancelled in period |
$ 43.07 |
|
| Exercises in period |
$ 1.77 |
|
| Weighted-average exercise price, options outstanding |
$ 8.38 |
$ 8.77 |
| Weighted-average exercise price, options exercisable |
$ 8.17 |
|
| Weighted-average exercise price, options vested and expected to vest |
$ 11.79 |
|
| Weighted-average remaining contractual life, options outstanding |
9 years 7 days |
8 years 6 months 29 days |
| Weighted-average remaining contractual life, options vested and expected to vest |
8 years 8 months 27 days |
|
| Weighted-average remaining contractual life, options exercisable |
6 years 3 months 11 days |
|
| Aggregate Intrinsic value, options outstanding |
$ 5,578 |
$ 11,818 |
| Aggregate Intrinsic value, options vested and expected to vest |
5,131 |
|
| Aggregate Intrinsic value, options exercisable |
$ 1,504 |
|