Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation (Details 2)

v2.4.0.6
Stock Based Compensation (Details 2) (USD $)
 6 Months Ended
Jun. 30, 2012
Stock option activity under equity incentive plan  
Number of Shares, Outstanding at December 31, 2011 3,672,179
Weighted-Average Exercise Price, Outstanding at December 31, 2011 $ 1.45
Number of Shares, Granted 1,591,000
Weighted-Average Exercise Price, Granted $ 6.13
Number of Shares, Exercised (191,301)
Weighted-Average Exercise Price, Exercised $ 1.27
Number of shares, Forfeitures   
Weighted-Average Exercise Price, Forfeitures   
Number of Shares, Outstanding at June 30, 2012 5,071,878
Weighted-Average Exercise Price, Outstanding at June 30, 2012 $ 2.92
Weighted-Average Remaining Contractual Term, Outstanding at June 30, 2012 8 years 4 months 24 days
Aggregate Intrinsic Value, Outstanding at June 30, 2012 $ 22,700,291
Number of Shares, Vested and expected to vest June 30, 2012 5,005,471
Weighted-Average Exercise Price, Vested and expected to vest June 30, 2012 $ 2.90
Weighted-Average Remaining Contractual Term, Vested and expected to vest June 30, 2012 8 years 4 months 21 days
Aggregate Intrinsic Value, Vested and expected to vest June 30, 2012 22,514,740
Number of Shares, Exercisable at June 30, 2012 1,964,595
Weighted-Average Exercise Price, Exercisable at June 30, 2012 $ 1.55
Weighted-Average Remaining Contractual Term, Exercisable at June 30, 2012 7 years 3 months 26 days
Aggregate Intrinsic Value, Exercisable at June 30, 2012 $ 11,492,141