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GENERAL AND ADMINISTRATIVE EXPENSES - Schedule of major classes of general and administrative expenses (Detail) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
General and Administrative Expense [Abstract]    
Legal costs $ 896,489 $ 249,275
Professional fees 282,153 117,840
Rent 72,368 102,826
Payroll expenses 823,966 699,311
Other general and administrative expenses 273,385 301,815
Total general and administrative expenses $ 2,348,361 $ 1,471,067