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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, 2020 | Dec. 31, 2019
Accounting Policies [Abstract] |  |
Debt issuance costs and bank fees paid to financial institutions | $ 6,547,299 | $ 9,302,292
Less: accumulated amortization | (2,650,091) | (5,164,419)
Unamortized debt issuance costs and bank fees | 3,897,208 | 4,137,873
Amortization included in interest expense | $ 662,440 | $ 727,020

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