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Net Loss Per Share
 12 Months Ended
Dec. 31, 2012
Net Loss Per Share

12.    Net Loss Per Share

Basic net loss per share is calculated by dividing the net loss by the weighted-average number of common shares outstanding during the period. Diluted net loss per share is computed by dividing the net loss attributable to us by the weighted-average number of common shares outstanding during the period and dilutive potential common shares using the treasury-stock method. For purposes of this calculation, common stock subject to repurchase by us, options and warrants are considered to be dilutive potential common shares and are only included in the calculation of diluted net loss per share when their effect is dilutive.

 

     December 31,  
     2012     2011     2010  

Basic and diluted net loss per share (in thousands, except per share amounts):

       

Numerator:

       

Net loss

    $ (69,949 )    $ (48,597 )    $ (57,308 ) 
  

 

 

    

 

 

    

 

 

  

Denominator for basic and diluted net loss per share:

       

Weighted-average common shares outstanding

      170,469        125,101        82,463   
  

 

 

    

 

 

    

 

 

  

Basic and diluted net loss per share

    $ (0.41 )    $ (0.39 )    $ (0.69 ) 
  

 

 

    

 

 

    

 

 

  

Outstanding warrants, stock options and stock subject to repurchase by us under stock awards were excluded from the calculation of net loss per share as the effect of their inclusion would have been anti-dilutive.

 

     December 31,  
     2012      2011      2010  

Outstanding securities not included in diluted net loss per share calculation (in thousands):

         

Stock options and stock awards

      15,561         11,101         7,288   

Warrants

      12,714         25,729         25,734   
  

 

 

     

 

 

     

 

 

  
     28,275         36,830         33,022