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ACCRUED EXPENSES AND OTHER LIABILITIES - Accrued Expenses and Other Liabilities (Details) - USD ($)
Mar. 31, 2020
Dec. 31, 2019
Payables And Accruals [Abstract]    
Research and development costs and other accrued expenses $ 3,090,336 $ 3,824,950
Accrued bonus 504,600  
Professional fees 281,050 314,213
Vacation pay 60,247  
Accrued expenses and other liabilities $ 3,936,233 $ 4,139,163