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NET LOSS PER SHARE OF COMMON STOCK - Securities Excluded from Calculation of Weighted Average Shares Outstanding as their Effect is Antidilutive (Details) - shares
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Common Stock Options    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Securities outstanding excluded from the calculation of weighted average shares outstanding 8,378,672 6,555,150
Restricted Stock Units    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Securities outstanding excluded from the calculation of weighted average shares outstanding 127,300 185,950
Common Stock Warrants    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Securities outstanding excluded from the calculation of weighted average shares outstanding 40,790 40,790