Other Financial Information - Schedule of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Goodwill [Roll Forward]
Balance, beginning of year	$ 0	$ 0
Balance, end of year	134,848	0
Indian Ocean Rare Earth Metals Pte. Ltd.
Goodwill [Roll Forward]
IORM Acquisition	$ 134,848	$ 0

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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+ Details