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Net Loss Per Common Share (Tables)
9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Schedule of outstanding shares of common stock equivalents that have been excluded from diluted net loss per common share
The following outstanding common stock equivalents have been excluded from diluted net loss per common share because their inclusion would be anti-dilutive:
  
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Shares of common stock subject to outstanding options
5,995,401

 
6,322,215

 
6,065,250

 
6,134,966

Employee stock purchase plan
27,117

 
25,481

 
32,513

 
31,944

Restricted stock units
445,598

 
70,000

 
363,896

 
59,945

Total common stock equivalents
6,468,116

 
6,417,696

 
6,461,659

 
6,226,855