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Related Party Transactions - Statement Of Operations Related Party Transactions (Details) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended	5 Months Ended	6 Months Ended
	Jun. 30, 2023	Jun. 07, 2023	Jun. 30, 2024	Jun. 07, 2023	Jun. 30, 2024
Related Party Transaction [Line Items]
Option settlement – related party	$ 79,054	$ 0	$ 0	$ 0	$ 0
Related Party
Related Party Transaction [Line Items]
General and administrative	14	62	27	177	52
Research and development	87	5,779	395	12,243	662
Option settlement – related party	79,054	0	0	0	0
Related Party | BHES
Related Party Transaction [Line Items]
Research and development	0	5,527	0	11,713	0
Related Party | Master services agreement administrative costs
Related Party Transaction [Line Items]
General and administrative	14	37	27	80	52
Related Party | Engineering support provided by former board member
Related Party Transaction [Line Items]
General and administrative	0	25	0	97	0
Related Party | Master services agreement costs for Demonstration Plant
Related Party Transaction [Line Items]
Research and development	$ 87	$ 252	$ 395	$ 530	$ 662

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Option Settlement Expense

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The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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Amount of expense for research and development. Includes, but is not limited to, cost for computer software product to be sold, leased, or otherwise marketed and writeoff of research and development assets acquired in transaction other than business combination or joint venture formation or both. Excludes write-down of intangible asset acquired in business combination or from joint venture formation or both, used in research and development activity.

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