|
Share-Based Compensation (Details 1) (USD $)
|
9 Months Ended |
|
Sep. 30, 2012
|
| Summary of stock options activity |
|
| Beginning Balance, Option Shares Outstanding |
934,816 |
| Granted, Option Shares Outstanding |
813,198 |
| Exercised, Option Shares Outstanding |
(13,510) |
| Forfeited, Option Shares Outstanding |
(21,306) |
| Ending Balance, Option Shares Outstanding |
1,713,198 |
| Vested and expected to vest, Option Shares Outstanding |
1,566,755 |
| Vested, Option Shares Outstanding |
499,338 |
| Beginning Balance, Weighted Average Exercise Price |
$ 4.88 |
| Granted, Weighted Average Exercise Price |
$ 23.57 |
| Exercised, Weighted Average Exercise Price |
$ 3.12 |
| Forfeited, Weighted Average Exercise Price |
$ 9.07 |
| Ending Balance, Weighted Average Exercise Price |
$ 13.71 |
| Vested and expected to vest, Weighted Average Exercise Price |
$ 13.11 |
| Vested, Weighted Average Exercise Price |
$ 3.99 |
| Outstanding, Weighted Average Remaining Contractual Term (Years) |
8 years 9 months 15 days |
| Vested and expected to vest, Weighted Average Remaining Contractual Term (Years) |
8 years 8 months 27 days |
| Vested, Weighted Average Remaining Contractual Term (Years) |
7 years 10 months 28 days |
| Outstanding, Aggregate Intrinsic Value |
$ 14,294,555 |
| Vested and expected to vest, Aggregate Intrinsic Value |
13,843,903 |
| Vested, Aggregate Intrinsic Value |
$ 8,218,956 |