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Accounts Receivable and Other - Additional Information (Detail) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
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Related Party [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable | $ 673,220 | $ 664,596
Neptune Minerals, Inc. [Member] | Related Party [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable | 614,123 | 612,498
Deep Sea Mineral Exploration Company [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Accounts receivable | $ 59,097 | $ 52,098

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- Definition Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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