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Property and Equipment - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
May 31, 2017
Property, Plant and Equipment [Line Items]          
Vessel assets sold and consideration received   $ 100,000      
Capitalized cost of assets held for sale   4,600,000     $ 416,329
Proceeds from sale of property and equipment   1,000,000      
Gain on sale of equipment   897,664 $ 289,328 $ 992,595  
Gain on sale of marine assets   897,664 289,328 992,595  
Cash proceeds from sale of vessel   $ 1,003,662 80,000 200,000  
Non Cash [Member]          
Property, Plant and Equipment [Line Items]          
Gain on sale of equipment       792,595  
Gain on sale of marine assets       $ 792,595  
Note 2 [Member]          
Property, Plant and Equipment [Line Items]          
Loans payable, repayment $ 650,000   650,000    
Marine Vessel [Member]          
Property, Plant and Equipment [Line Items]          
Cash proceeds from sale of vessel $ 650,000   $ 650,000