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Other Long-Term Assets - Components of Other Long-Term Assets (Detail) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Recovered cargo   $ 730,463
Deposits $ 540,590 541,590
Total other long-term assets $ 540,590 $ 1,272,053