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Basis of Presentation and Significant Accounting Policies - Advance Hire, Prepaid Expenses and Other Current Assets (Details) - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Advance hire $ 10,599,721 $ 5,026,953
Prepaid expenses 4,615,198 3,706,396
Accrued receivables 16,697,727 6,823,409
Margin deposit 0 814,062
Derivative assets 13,670,383 0
Other current assets 7,251,861 3,145,125
Advance hire, prepaid expenses and other current assets $ 52,834,890 $ 19,515,945