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Net loss per common share (Tables)
6 Months Ended
Jun. 30, 2016
Potential Dilutive Securities Outstanding

Potentially dilutive securities outstanding are summarized as follows (in shares):

 

     June 30,  
     2016      2015  

Exercise of common stock options

     28,219,831         19,985,768   

Vesting of restricted stock units

     4,553,757         2,198,173   

Exercise of common stock warrants

     48,702,990         4,090,013   

Conversion of senior convertible notes into common stock

     4,072,809         14,708,590   
  

 

 

    

 

 

 
     85,549,387         40,982,544