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Mineral Rights and Properties, Net - Summary of Mineral Rights and Properties, Net (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023
--- | --- | ---
Mineral Properties Net [Line Items] |  |  |
Mineral rights and properties, net |  | $ 7,632 | $ 7,637
Mineral properties [Member] |  |  |
Mineral Properties Net [Line Items] |  |  |
Mineral rights and properties, net |  | 6,733 | 6,733
Hydrology Wells [Member] |  |  |
Mineral Properties Net [Line Items] |  |  |
Mineral rights and properties, net |  | 547 | 547
Asset Retirement Cost [Member] |  |  |
Mineral Properties Net [Line Items] |  |  |
Mineral rights and properties, net | [1] | $ 352 | $ 357
[1] | Asset retirement costs represent the carrying value of capitalized costs associated with asset retirement obligations discussed in Note 5.

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