v2.4.0.6
Stock Awards (Details) (USD $)
 6 Months Ended
Jun. 30, 2012
Summary of stock option activity  
Number of Shares, Outstanding at December 31, 2011 39,601,640
Number of Shares, Granted 6,547,060
Number of Shares, Exercised (5,192,303)
Number of Shares, Forfeited (2,532,977)
Number of shares, Cancelled (288,500)
Number of Shares, Outstanding at June 30, 2012 38,134,900
Number of Shares, Vested and expected to vest as of June 30, 2012 37,328,778
Number of Shares, Vested and exercisable as of June 30, 2012 8,792,753
Weighted-Average Exercise Price, Outstanding at December 31, 2011 $ 2.20
Weighted-Average Exercise Price, Granted $ 11.93
Weighted-Average Exercise Price, Exercised $ 0.61
Weighted-Average Exercise Price, Forfeited $ 2.62
Weighted-Average Exercise Price Cancelled $ 1.82
Weighted-Average Exercise Price, Outstanding at June 30, 2012 $ 4.06
Weighted-Average Exercise Price, Vested and expected to vest as of June 30, 2012 $ 4.02
Weighted-Average Exercise Price, Vested and exercisable as of June 30, 2012 $ 1.37
Weighted-Average Remaining Contractual Term, Outstanding at June 30, 2012 8 years 8 months 23 days
Weighted-Average Remaining Contractual Term, Vested and expected to vest as of June 30, 2012 8 years 8 months 19 days
Weighted-Average Remaining Contractual Term, Vested and exercisable as of June 30, 2012 7 years 4 months 13 days
Aggregate Intrinsic Value, Outstanding at June 30, 2012 $ 783,334,667
Aggregate Intrinsic Value, Vested and expected to vest as of June 30, 2012 768,157,382
Aggregate Intrinsic Value, Vested and exercisable as of June 30, 2012 $ 204,228,567