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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cash, Cash Equivelants and Restricted Cash (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]      
Money market accounts – cash equivalents $ 13,819,043 $ 21,009,821  
Cash 39,795,692 13,521,991  
Total cash and cash equivalents 53,614,735 34,531,812  
Restricted cash 2,500,000 4,000,000  
Total cash, cash equivalents and restricted cash $ 56,114,735 $ 38,531,812 $ 28,422,949