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Net Loss Per Share - Schedule of Diluted Loss Per Share (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Numerator        
Net loss (numerator for use in basic net loss per share) $ (25,015,672) $ (34,134,570) $ (64,005,625) $ (66,699,593)
Adjustment for decrease in fair value of warrant liability 0 (423,296) 0 (227,273)
Numerator for use in diluted net loss per share $ (25,015,672) $ (34,557,866) $ (64,005,625) $ (66,926,866)
Denominator        
Weighted average number of common shares outstanding (denominator for use in basic net loss per share) (shares) 92,423,122 86,952,024 91,350,117 78,894,881
Effect of dilutive potential common shares (shares) 0 138,659 0 148,599
Denominator for use in diluted net loss per share (shares) 92,423,122 87,090,683 91,350,117 79,043,480
Net loss per share, diluted (dollars per share) $ (0.27) $ (0.40) $ (0.70) $ (0.85)
Net loss per share, basic (dollars per share) $ (0.27) $ (0.39) $ (0.70) $ (0.85)