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

15. Net Loss per Share

We compute basic loss per share by dividing net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding during the period. The calculation of basic loss per share gives retroactive effect to the recapitalization related to our reverse acquisition of Earth911. We have other potentially dilutive securities outstanding that are not shown in a diluted loss per share calculation because their effect in both 2013 and 2012 would be anti-dilutive. These potentially dilutive securities include options, warrants, and convertible promissory notes and totaled 15,164,789 and 17,270,346 shares at December 31, 2013 and 2012, respectively.

The following table sets forth the computation of basic and diluted loss per share:

 

     Years ended December 31,  
     2013     2012  

Net loss applicable to common stockholders—numerator for basic and diluted earnings per share

    $ (17,799,351 )    $ (42,151,493 ) 
  

 

 

    

 

 

  

Weighted—average common shares outstanding—denominator for basic earnings per share

      77,055,327        56,988,497   

Net loss per share:

     

Basic and diluted

    $ (0.23 )    $ (0.74 ) 
  

 

 

    

 

 

  

The following table sets forth the anti-dilutive securities excluded from diluted loss per share:

 

Anti-dilutive securities excluded from diluted loss per share:

      

Stock options

      4,141,948         3,350,115   

Warrants

      —          8,286,689   

Convertible notes

      11,022,841         5,633,542