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Accounts Receivable and Other, Net - Additional Information (Detail) - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Related Party [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 664,596	$ 183,453
Neptune Minerals, Inc. [Member] | Related Party [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	612,498	183,453
Deep Sea Mineral Exploration Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 52,098	$ 0

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

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+ 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

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