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Exploration License - Additional Information (Detail) - USD ($) | Sep. 30, 2019 | Jul. 09, 2019
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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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