v2.4.0.6
Common Stock (Tables)
 6 Months Ended
Jun. 30, 2012
Common Stock [Abstract]  
Common stock outstanding and reserved shares of common stock for future issuance

A summary of the stock option activity for the six months ended June 30, 2012 is as follows:

 

                                 
    Number of
Shares		     Weighted-
Average
Exercise Price		     Weighted-
Average
Remaining
Contractual
Term		     Aggregate
Intrinsic Value		  

Outstanding at December 31, 2011

     39,601,640     $ 2.20                  

Granted

     6,547,060       11.93                  

Exercised

     (5,192,303 )      0.61                  

Forfeited

     (2,532,977 )      2.62                  

Cancelled

     (288,500 )      1.82                  
   

 

 

                          

Outstanding at June 30, 2012

     38,134,900     $ 4.06       8.73 years     $ 783,334,667  
   

 

 

    

 

 

    

 

 

    

 

 

  

Vested and expected to vest as of June 30, 2012

     37,328,778     $ 4.02       8.72 years     $ 768,157,382  
   

 

 

    

 

 

    

 

 

    

 

 

  

Vested and exercisable as of June 30, 2012

     8,792,753     $ 1.37       7.37 years     $ 204,228,567