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NET LOSS PER SHARE OF COMMON STOCK - Computation of Basic and Diluted Loss Per Share (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Earnings Per Share [Abstract]    
Net loss $ (15,827,200) $ (12,418,263)
Weighted average shares of common stock outstanding 38,968,110 38,749,343
Net loss per share of common stock – basic and diluted $ (0.41) $ (0.32)