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ACCRUED EXPENSES AND OTHER LIABILITIES - Accrued Expenses and Other Liabilities (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Payables And Accruals [Abstract]      
Research and development costs and other accrued expenses $ 2,572,814   $ 1,353,987
Accrued bonus 501,014    
Professional fees 395,497   455,545
Vacation pay 251,630    
Accrued expenses and other liabilities $ 3,720,955 $ 1,809,532 $ 1,809,532