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Net Loss Per Share - Schedule of Diluted Loss Per Share (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Numerator        
Net loss $ (6,639,125) $ (9,479,116) $ (38,989,953) $ (32,565,023)
Adjustment for decrease in fair value of warrant liability (259,971) 0 (132,130) 0
Numerator for use in diluted net loss per share $ (6,899,096) $ (9,479,116) $ (39,122,083) $ (32,565,023)
Denominator        
Weighted average number of common shares outstanding (shares) 91,153,776 75,409,702 90,804,722 74,783,791
Effect of dilutive potential common shares (shares) 87,884 0 86,070 0
Denominator for use in diluted net loss per share (shares) 91,241,660 75,409,702 90,890,792 74,783,791
Net loss per share, diluted (dollars per share) $ (0.08) $ (0.13) $ (0.43) $ (0.44)