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Accrued Expenses - Components of Accrued Expenses (Detail) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Compensation and incentives $ 2,567,732 $ 1,871,071
Professional services 400,367 329,640
Interest 6,508,621 4,056,337
Accrued insurance obligations 309,826 249,247
Other operating 18,000 45,040
Total accrued expenses $ 9,804,546 $ 6,551,335