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Net Loss Per Share - Schedule of Computation of Anti-Dilutive Weighted-Average Shares Outstanding (Details) - shares
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Potential dilutive securities excluded from computation of diluted net loss per common share 25,882,672 20,080,240
Options to Purchase Common Stock [Member]    
Potential dilutive securities excluded from computation of diluted net loss per common share 2,980,432 1,427,045
Warrants to Purchase Common Stock [Member]    
Potential dilutive securities excluded from computation of diluted net loss per common share 22,902,240 18,653,195