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Inventory - Schedule of Inventory (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Inventory [Line Items]
Materials and supplies	$ 146	$ 71
Total	10,986	20,967
Purchased uranium inventories
Inventory [Line Items]
Inventory, raw materials	1,188	16,614
Raw uranium
Inventory [Line Items]
Inventory, raw materials	4,929	1,564
Uranium concentrates from extraction
Inventory [Line Items]
Inventory, raw materials	$ 4,723	$ 2,718

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