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Net Loss Per Share
 12 Months Ended
Dec. 31, 2013
Earnings Per Share [Abstract]  
Net Loss Per Share

9. Net Loss Per Share

Net Loss Per Share

Basic and diluted net loss per share attributable to common stockholders was calculated as follows for the years ended December 31, 2011, 2012 and 2013:

 

     Year Ended December 31,  
     2011     2012     2013  

Numerator:

       

Net loss

    $ (13,157 )    $ (13,880 )    $ (14,027 ) 

Accretion of redeemable convertible preferred stock to redemption value

      (53 )      (67 )      (213 ) 
  

 

 

    

 

 

    

 

 

  

Net loss attributable to common stockholders

    $ (13,210 )    $ (13,947 )    $ (14,240 ) 
  

 

 

    

 

 

    

 

 

  

Denominator:

       

Weighted average common shares outstanding, basic and diluted

      688,946        709,678        729,001   
  

 

 

    

 

 

    

 

 

  

Net loss per share attributable to common stockholders, basic and diluted

    $ (19.17 )    $ (19.65 )    $ (19.53 ) 
  

 

 

    

 

 

    

 

 

  

The Company excluded the following common stock equivalents, outstanding as of December 31, 2011, 2012 and 2013, from the computation of diluted net loss per share attributable to common stockholders for the years ended December 31, 2011, 2012 and 2013 because they had an anti-dilutive impact due to the net loss attributable to common stockholders incurred for the periods.

 

     December 31,  
     2011      2012      2013  

Stock options to purchase common stock

      916,094         591,427         1,310,330   

Unvested restricted common stock

      24,548         10,615         —     
  

 

 

     

 

 

     

 

 

  
     940,642         602,042         1,310,330