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Net Loss Per Share
 3 Months Ended
Mar. 31, 2012
Net Loss Per Share [Abstract]  
Net Loss Per Share

2. Net Loss Per Share

Basic net loss per share is calculated by dividing net loss for the period by the weighted average number of common shares outstanding during the period. Diluted net loss per share is computed by dividing net loss for the period by the weighted average number of shares of common stock outstanding during the period and including the dilutive effect of common stock that would be issued assuming conversion or exercise of outstanding warrants, stock options, share based compensation awards and other dilutive securities. No such items were included in the computation of diluted loss per share in the three months ended March 31, 2011 or 2012 because we incurred a net loss in each of these periods and the effect of inclusion would have been anti-dilutive.

Outstanding equity awards not included in the calculation of diluted net loss per share because their effect was anti-dilutive were as follows:

 

     March 31, 2011      March 31, 2012  
     Number of
Potential
Shares		      Range of
Exercise Prices		      Number of
Potential
Shares		      Range of
Exercise Prices 		 

Stock options

      6,323,898       $  0.47 - $16.36        9,402,732       $  0.47 - $16.36  

Unvested restricted stock awards

      1,894,715       $ —          1,584,618       $ —    

Warrants

      1,602,489       $ 2.40         1,602,489       $ 2.40