XML 111 R96.htm IDEA: XBRL DOCUMENT
v3.22.1

The Company - U.S. Department of Energy Phase Two NuScale SMR First of a kind ("FOAK") Nuclear Demonstration Readiness Project (Details) - Phase Two NuScale SMR First of a kind ("FOAK") Nuclear Demonstration Readiness Project - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Oct. 31, 2018 | Dec. 31, 2021
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Cost share |  | $ 40,000 |
Cost share (as a percent) | 46.00% | 50.00% |
Amount eligible to receive |  |  | $ 43,200
Cumulative cash received |  |  | $ 41,854
Government [Member] |  |  |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |  |  |
Cost share |  | $ 40,000 |
Cost share (as a percent) |  | 50.00% |

X
- Definition Represents the amount eligible to receive. + References No definition available. + Details
Name: | svsvu_AmountEligibleToReceive
Namespace Prefix: | svsvu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the cost share in the project. + References No definition available. + Details
Name: | svsvu_CostShare
Namespace Prefix: | svsvu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of cumulative cash received. + References No definition available. + Details
Name: | svsvu_CumulativeCashReceived
Namespace Prefix: | svsvu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the percentage of cost share. + References No definition available. + Details
Name: | svsvu_PercentageOfCostShare
Namespace Prefix: | svsvu_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesAxis=svsvu_PhaseTwoNuscaleSmrFirstOfKindFoakNuclearDemonstrationReadinessProjectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis=us-gaap_GovernmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |