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ACCRUED EXPENSES - Accrued Expenses and Other Liabilities (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Payables And Accruals [Abstract]    
Research and development costs and other accrued expenses $ 859,901 $ 574,290
Accrued bonus 761,971  
Professional fees 334,752 192,000
Vacation payable 37,827  
Interest payable 27,954 49,523
Accrued expenses and other liabilities $ 2,022,405 $ 815,813