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Other Current Assets - Additional Information (Detail) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Other Assets Current [Line Items]    
Prepaid expenses $ 582,616 $ 497,118
Prepaid insurance premiums   292,674
Prepaid expenses for vessel fuel   105,707
Prepaid operating costs   $ 98,737
Directors and Officers Insurance [Member]    
Other Assets Current [Line Items]    
Prepaid expenses 260,321  
Marine Insurance [Member]    
Other Assets Current [Line Items]    
Prepaid expenses 132,316  
Professional Services [Member]    
Other Assets Current [Line Items]    
Prepaid expenses 166,389  
Other Insurances [Member]    
Other Assets Current [Line Items]    
Prepaid expenses $ 23,590