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Accrued Expenses - Components of Accrued Expenses (Detail) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Payables and Accruals [Abstract]    
Compensation and bonuses $ 1,687,214 $ 866,551
Vessel operations   1,528,478
Professional services 544,412 942,604
Interest 2,391,857 828,888
Accrued insurance payable 393,715  
Other operating 60,927 98,935
Total accrued expenses $ 5,078,125 $ 4,265,456