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Net Loss per Share
 9 Months Ended
Sep. 30, 2012
Net Loss per Share [Abstract]  
Net loss per share

9. Net loss per share

Basic net loss per share is computed by dividing the net loss for the year by the weighted average number of common shares outstanding during the year. Diluted loss per share is calculated in accordance with the treasury stock method and reflects the potential dilution that would occur if securities or other contracts to issue common stock were exercised or converted to common stock. Since the effect of the assumed exercise of common stock options and other convertible securities was anti-dilutive for all periods presented, basic and diluted loss per share are the same.

The following table summarizes potential 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