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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Net Debt Issuance Costs and Bank Fees (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]    
Debt issuance costs and bank fees paid to financial institutions $ 6,341,393 $ 6,068,806
Less: accumulated amortization (4,437,399) (4,199,026)
Unamortized debt issuance costs and bank fees 1,903,994 1,869,780
Amortization included in interest expense $ 693,788 $ 681,279