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Net Loss Per Share - Schedule of Diluted Net Loss Per Share (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Numerator        
Net loss $ (29,387,226) $ (6,639,125) $ (58,606,488) $ (38,989,953)
Adjustment for decrease in fair value of warrant liability 0 (259,971) 0 (132,130)
Numerator for use in diluted net loss per share $ (29,387,226) $ (6,899,096) $ (58,606,488) $ (39,122,083)
Denominator        
Weighted average number of common shares outstanding (shares) 98,083,896 91,153,776 97,795,910 90,804,722
Effect of dilutive potential common shares (shares) 0 87,884 0 86,070
Denominator for use in diluted net loss per share (shares) 98,083,896 91,241,660 97,795,910 90,890,792
Net loss per share, diluted (dollars per share) $ (0.30) $ (0.08) $ (0.60) $ (0.43)