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Accounts Receivable - Additional Information (Detail) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reserves for doubtful accounts   $ 2,345,729
Accounts receivable, net $ 263,745 473,806
Neptune Minerals, Inc. [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Reserves for doubtful accounts   2,345,729
Accounts receivable, net   0
Monaco [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable $ 209,570 $ 205,497