Net Loss Per Share (Tables)
 6 Months Ended
Jun. 30, 2015
Earnings Per Share [Abstract]  
Schedule of Outstanding Shares of Common Stock Equivalents Excluded from Calculation of Diluted Net Loss Per Share Attributable to Common Stockholders

The following outstanding shares of common stock equivalents were excluded from the calculation of diluted net loss per share attributable to common stockholders for the periods presented because including them would have been antidilutive:

 

     As of
June 30,		  
     2015      2014  

Options to purchase common stock

      3,294,849         966,778   

Common stock subject to repurchase

      116,674         —     

Convertible preferred stock

      252,817         252,818   

Redeemable convertible preferred stock

      17,328,059         17,236,784   

Warrants for preferred stock

      885,201         984,529   
  

 

 

     

 

 

  

Total potential dilutive shares

      21,877,600         19,440,909