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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Net Debt Issuance Costs and Bank Fees (Details) - USD ($) | 12 Months Ended
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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

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