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Net Loss Per Share
 12 Months Ended
Dec. 31, 2016
Earnings Per Share [Abstract]  
Net Loss Per Share
Net Loss Per Share

The following outstanding common stock equivalents have been excluded from diluted net loss per common share for the years ended December 31, 2016, 2015 and 2014 because their inclusion would be anti-dilutive:

 
Year Ended December 31,
 
2016
 
2015
 
2014
Shares of common stock subject to outstanding options
5,093,454

 
4,086,640

 
3,035,614

Employee stock purchase plan
36,651

 
15,561

 
—

Restricted stock units
25,000

 
—

 
—

Total common stock equivalents
5,155,105

 
4,102,201

 
3,035,614