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Other Current Assets - Additional Information (Detail) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Other Assets Current [Line Items]    
Prepaid expenses $ 471,686 $ 582,616
Directors and Officers Insurance [Member]    
Other Assets Current [Line Items]    
Prepaid expenses 316,795 260,321
Marine Insurance [Member]    
Other Assets Current [Line Items]    
Prepaid expenses 67,447 132,316
Professional Services [Member]    
Other Assets Current [Line Items]    
Prepaid expenses 75,784 166,389
Other Insurances [Member]    
Other Assets Current [Line Items]    
Prepaid expenses $ 11,660 $ 23,590