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Net Loss per Share (Tables)
 9 Months Ended
Sep. 30, 2012
Net Loss per Share [Abstract]  
Summary of common shares that were excluded from the diluted net loss per share calculation because of their anti-dilutive effect
                 

Common Stock Equivalents

   As of
September 30,
2012		     As of
September 30,
2011		  

Options to purchase common stock

     16,538,985       14,419,591  

Warrants to purchase common stock

     21,593,844       18,333,454  

Convertible preferred stock

     38,233       38,233  
   

 

 

    

 

 

  

Total

     38,171,062       32,791,278