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NET LOSS PER SHARE OF COMMON STOCK - Computation of Basic and Diluted Loss Per Share (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share [Abstract]        
Net loss $ (11,260,575) $ (8,423,289) $ (31,685,295) $ (21,641,308)
Weighted average shares of common stock outstanding 40,880,359 34,806,263 37,676,686 30,393,293
Net loss per share, basic and diluted $ (0.28) $ (0.24) $ (0.84) $ (0.71)