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Property and Equipment - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
May 31, 2016
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]          
Proceeds from sale of property and equipment $ 200,000        
Vessel assets sold and consideration received 350,000        
Capitalized cost of assets held for sale $ 66,329        
Gain on sale of equipment     $ 289,328 $ 992,595  
Cash proceeds from sale of vessel     $ 80,000 200,000 $ 850,000
Non Cash [Member]          
Property, Plant and Equipment [Line Items]          
Gain on sale of equipment       $ 792,595  
Note 2 [Member]          
Property, Plant and Equipment [Line Items]          
Loans payable, repayment   $ 650,000      
Marine Vessel [Member]          
Property, Plant and Equipment [Line Items]          
Cash proceeds from sale of vessel   $ 650,000