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Net Loss per Share (Tables)
3 Months Ended
Mar. 31, 2020
Earnings Per Share [Abstract]  
Schedule of Antidilutive Securities Excluded from Computation of Net Loss per Share
The following potential shares of common stock, presented based on amounts outstanding at each period end, were excluded from the calculation of diluted net loss per share attributable to common stockholders for the periods indicated because including them would have had an anti-dilutive effect:
 
Three Months Ended March 31,
 
2020
 
2019
Outstanding stock options
3,179,605

 
3,564,631

Unvested restricted stock units
1,756,059

 
484,339

Unvested restricted common stock
248,625

 
603,054

ESPP shares issuable and outstanding
70,661

 
—

 
5,254,950

 
4,652,024