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Net Loss Per Share (Tables)
9 Months Ended
Sep. 30, 2019
Earnings Per Share [Abstract]  
Calculation of Historical Outstanding Dilutive Securities Not Included in Diluted Loss per Share

September 30, 

    

2019

    

2018

Outstanding options to purchase common stock

11,494,722

 

10,123,530

Outstanding warrants to purchase common stock

243,115

 

243,115

Total potentially dilutive shares excluded from loss per share

11,737,837

 

10,366,645