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Inventory - Schedule of Inventory (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Inventory [Line Items] |  |
Materials and supplies | $ 120 | $ 71
Total | 9,678 | 20,967
Purchased uranium inventories |  |
Inventory [Line Items] |  |
Inventory, raw materials | 1,188 | 16,614
Raw uranium |  |
Inventory [Line Items] |  |
Inventory, raw materials | 4,342 | 1,564
Uranium concentrates from extraction |  |
Inventory [Line Items] |  |
Inventory, raw materials | $ 4,028 | $ 2,718

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