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Potentially Dilutive Securities (Tables)
3 Months Ended
Mar. 31, 2016
Potentially Dilutive Securities Tables  
Potentially Dilutive Securities Excluded From Computation of Diluted Net Loss Per Common Share
   
As of March 31,
 
   
2016
   
2015
 
Options to purchase common stock
   
397,988
     
502,602
 
Restricted stock units
   
3,750
     
 
Warrants to purchase common stock
   
131,193
     
11,067
 
     
532,931
     
513,669