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Accrued Expenses - Components of Accrued Expenses (Detail) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Payables and Accruals [Abstract]    
Compensation and bonuses $ 1,871,071 $ 1,687,214
Professional services 329,640 544,412
Interest 4,056,337 2,391,857
Accrued insurance payable 249,247 393,715
Other operating 45,040 60,927
Total accrued expenses $ 6,551,335 $ 5,078,125