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Net Loss Per Share Attributable to Common Stockholders (Tables)
3 Months Ended
Mar. 31, 2017
Earnings Per Share [Abstract]  
Potentially Dilutive Securities Excluded from Computation of Diluted Weighted-Average Shares Outstanding

The following potentially dilutive securities that were outstanding prior to the use of the treasury stock method have been excluded from the computation of diluted weighted-average shares outstanding, because the inclusion of such securities would have an antidilutive impact due to the losses reported (in common stock equivalent shares):

 

     As of March 31,  
     2017      2016  

Options to purchase common stock

     5,441,105        3,991,586  

Warrants to purchase common stock

     365,564        300,564