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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income (expense)	$ 2,851	$ (6)	$ 5,948	$ (108)
General and administrative expenses	16,323	11,968	31,018	22,488
Other expenses	12,896	12,202	28,192	21,907
Research and development expenses	26,932	29,506	54,502	54,369
Restricted cash	60,192		60,192		$ 26,532
Revision of Prior Period, Reclassification, Adjustment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collaborative arrangement, cost share				115
Interest income (expense)				(115)
General and administrative expenses		878		2,114
Other expenses		2,597		1,361
Research and development expenses			1,855
Nuscale SMR FOAK Nuclear Demonstration Readiness Project Completion
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collaborative arrangement, cost share	7,193	25,172	19,547	45,634
United State Trade and Development Agency | Government
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collaborative arrangement, cost share	6,882	$ 0	9,297	$ 115
Carbon Free Power Project Award | Government
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collaborative arrangement, government cost share	$ 2,165		$ 5,104

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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