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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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