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Net Loss Per Share
9 Months Ended
Sep. 30, 2015
Earnings Per Share [Abstract]  
Net Loss Per Share
3. Net Loss Per Share

Net loss per share is computed by dividing the net loss by the weighted average number of shares of common stock outstanding. Any outstanding stock options and warrants have not been included in the calculation of the diluted net loss per share because to do so would be anti-dilutive. Accordingly, the numerator and the denominator used in computing both basic and diluted net loss per share for each period are the same.

The following shares underlying outstanding options and warrants were excluded from the computation of basic and diluted net loss per share for the periods presented because their effect would have been anti-dilutive (in thousands):

 

     Three Months Ended      Nine Months Ended  
     September 30,      September 30,  
     2015      2014      2015      2014  

Options to purchase common stock

     4,208        3,294        4,025        3,098  

Restricted stock units

     15        —          15        —    

Common stock warrants

     572        585        572        601