Accounts Receivable and Other - Additional Information (Detail) - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Related Party [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 499,928	$ 664,596
Neptune Minerals, Inc. [Member] \| Related Party [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	434,411	612,498
Deep Sea Mineral Exploration Company [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable	$ 63,847	$ 52,098

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.

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

Name:	us-gaap_AccountsReceivableGrossCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant