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Exploration License - Additional Information (Detail) - USD ($)	Dec. 31, 2019	Jul. 09, 2019
Accounting Standards Update 2017-01 [Member]
Business Acquisition [Line Items]
Percent of ownership acquired	79.90%
Bismarck [Member]
Business Acquisition [Line Items]
Annual Fee Due		$ 14,000
Bismarck [Member] | Accounting Standards Update 2017-01 [Member]
Business Acquisition [Line Items]
Percent of ownership acquired		79.90%

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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