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Accounts Receivable and Other - Additional Information (Detail) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Related Party [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable $ 234,955 $ 664,596
Neptune Minerals, Inc. [Member] | Related Party [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable 141,738 612,498
Deep Sea Mineral Exploration Company [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivable $ 91,547 $ 52,098