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Potentially Dilutive Securities (Tables)
9 Months Ended
Sep. 30, 2015
Potentially Dilutive Securities Tables  
Potentially Dilutive Securities Excluded From Computation of Diluted Net Loss Per Common Share
   
As of September 30,
 
    
2015
    
2014
Options to purchase common stock
 
 527,120
 
 336,102
Unvested restricted stock units to purchase common stock
 
 3,750
 
ESPP contributions to purchase common stock
 
 375
 
 430
Warrants to purchase common stock
 
 11,067
 
 11,067
 
 
 542,312
 
 347,599