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The Company - U.S. Department of Energy NuScale SMR FOAK Nuclear Demonstration Readiness Project Completion (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Feb. 29, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2022
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |
Deferred DOE cost share liabilities |  | $ 10,237 | $ 0 | $ 10,237
NuScale SMR FOAK Nuclear Demonstration Readiness Project Completion |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |
Maximum amount awarded | $ 350,000 |  |  |
Cost share | $ 350,000 |  |  |
Cost share (as a percent) | 50.00% |  |  |
Reimbursement of program costs (as a percent) | 73.00% |  |  |
Deferred DOE cost share liabilities |  | $ 10,237 | 0 |
Percentage of Maximum future reimbursement requests to recognize deferred reimbursement costs |  | 50.00% |  |
Cumulative cash received |  | $ 57,817 | $ 100,500 |
NuScale SMR FOAK Nuclear Demonstration Readiness Project Completion | Accounts Receivable [Member] |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |
Cumulative cash received |  | 158,317 |  |
Amount obligated under current budget period |  | 12,183 |  |
NuScale SMR FOAK Nuclear Demonstration Readiness Project Completion | Government [Member] |  |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |  |
Cost share | $ 350,000 |  |  |
Cost share (as a percent) | 50.00% |  |  |
Term of award | 5 years |  |  |
Percentage of reimbursement requests deferred | 23.00% |  |  |
Amount obligated under current budget period |  | $ 1,972 |  |

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