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Net Loss Per Share (Tables)
3 Months Ended
Mar. 31, 2020
Earnings Per Share [Abstract]  
Calculation of Historical Outstanding Dilutive Securities Not Included in Diluted Loss per Share

March 31, 

    

2020

    

2019

Outstanding options to purchase common stock

12,591,341

 

11,840,521

Outstanding warrants to purchase common stock

243,115

 

243,115

Total potentially dilutive shares excluded from loss per share

12,834,456

 

12,083,636