Represents the number of common stock shares subject aggregate of sponsor surrendered.

No definition available.

Name:	svsvu_AggregateOfSponsorSharesSurrendered
Namespace Prefix:	svsvu_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

"Number of shares of the company that are subject to forfeiture represented as a percentage of issued and outstanding stock as a result of partial exercise of over-allotment option. "

+ References

No definition available.

+ Details

Name:	svsvu_CommonStockSharesSubjectToForfeitureAsPercentOfIssuedAndOutstandingShares
Namespace Prefix:	svsvu_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the maximum number of common stock shares subject to forfeiture.

+ References

No definition available.

+ Details

Name:	svsvu_MaximumCommonStockSharesSubjectToForfeiture
Namespace Prefix:	svsvu_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of shares of the company that were no longer subject to forfeiture.

+ References

No definition available.

+ Details

Name:	svsvu_NumberOfSharesNoLongerSubjectToForfeiture
Namespace Prefix:	svsvu_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of shares transferred to others during the period.

+ References

No definition available.

+ Details

Name:	svsvu_StockTransferredToOthersDuringPeriodShares
Namespace Prefix:	svsvu_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The threshold period after the business combination in which the 20 trading days within any 30 trading day period commences for the transfer, assigning or sale of any shares of the company, after the completion of the initial business combination.

+ References

No definition available.

+ Details

Name:	svsvu_ThresholdPeriodAfterBusinessCombinationInWhichSpecifiedTradingDaysWithinAnySpecifiedTradingDayPeriodCommences
Namespace Prefix:	svsvu_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Price of the entity's common stock which would be required to be attained to trigger the transfer, assign or sale of any shares or warrants of the company, after the completion of the initial business combination.

+ References

No definition available.

+ Details

Name:	svsvu_TransferAssignOrSellAnySharesOrWarrantsAfterCompletionOfInitialBusinessCombinationStockPriceTrigger
Namespace Prefix:	svsvu_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_CommonStockSharesOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- 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_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockConsiderationReceivedOnTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_OverAllotmentOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=svsvu_SponsorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_TitleOfIndividualAxis=svsvu_EachOfCompanysDirectorsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

RELATED PARTY TRANSACTIONS - Founder Shares (Details) - USD ($)			3 Months Ended
	Sep. 30, 2020	Aug. 21, 2020	Mar. 31, 2021	Dec. 31, 2020	Oct. 22, 2020	Aug. 22, 2020
Related Party Transaction [Line Items]
Common stock, shares subject to forfeiture, as a percent of issued and outstanding shares (as a percent)		20.00%	20.00%
Stock price trigger to transfer, assign or sell any shares or warrants of the company, after the completion of the initial business combination (in dollars per share)		$ 12.00	$ 12.00
Threshold period after the business combination in which the 20 trading days within any 30 trading day period commences		150 days	30 days
Class B ordinary shares
Related Party Transaction [Line Items]
Common shares, shares outstanding			5,750,000	5,750,000
Over-allotment \| Class B ordinary shares
Related Party Transaction [Line Items]
Shares subject to forfeiture		750,000
Shares no longer subject to forfeiture		750,000	750,000
Sponsor \| Each of the Company's directors
Related Party Transaction [Line Items]
Number of shares transferred	40,000
Sponsor \| Class B ordinary shares
Related Party Transaction [Line Items]
Consideration received		$ 25,000
Shares issued		7,187,500
Number of shares surrender					1,437,500
Common shares, shares outstanding						5,750,000