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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other expenses	$ (12,018)	$ (13,799)	$ (37,157)	$ (41,991)
Research and development expenses	12,160	63,725	37,447	118,227
Restricted cash	5,100		5,100		$ 5,100
Prepaid and other assets noncurrent portion	3,750		3,750		$ 15,000
United State Trade and Development Agency | Government
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collaborative arrangement, cost share	641	10,521	5,833	20,080
Nuscale SMR FOAK Nuclear Demonstration Readiness Project Completion
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collaborative arrangement, cost share		9,171	336	28,718
CFPP LLC | Government
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collaborative arrangement, government cost share	$ 19	$ 1,082	$ 335	6,186
Revision of Prior Period, Reclassification, Adjustment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Other expenses				1,855
Research and development expenses				$ 1,855

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