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Net Loss Per Share - Schedule of Diluted Loss Per Share (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Numerator    
Net loss $ (32,350,828) $ (23,085,907)
Adjustment for decrease in fair value of warrant liability 0 (116,477)
Numerator for use in diluted net loss per share $ (32,350,828) $ (23,202,384)
Denominator    
Weighted average number of common shares outstanding (shares) 90,451,791 74,152,609
Effect of dilutive potential common shares (shares) 0 148,275
Denominator for use in diluted net loss per share (shares) 90,451,791 74,300,884
Net loss per share, diluted (dollars per share) $ (0.36) $ (0.31)