Other Assets - Schedule of Other Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Operating lease right-of-use assets	$ 3,206	$ 3,458
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Total	Total
Prepaid construction costs	$ 3,915
Prepaid insurance, Thacker Pass	11,713	$ 0
Deposits on long-lead equipment	60,553	24,394
Total	$ 79,387	$ 27,852