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Net Loss Per Share (Tables)
12 Months Ended
Dec. 31, 2020
Net Loss Per Share  
Calculation of Historical Outstanding Dilutive Securities Not Included in Diluted Loss per Share

Year Ended December 31, 

2020

    

2019

    

2018

Outstanding options to purchase common stock

1,585,332

2,664,841

2,856,342

Outstanding warrants to purchase common stock

10,792

16,153

16,851

Total potentially dilutive shares excluded from loss per share

1,596,124

 

2,680,994

 

2,873,193