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FAIR VALUE MEASUREMENTS - Changes in fair value of warrant liabilities (Details) - USD ($) | 3 Months Ended | 4 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Class of Warrant or Right [Line Items] |  |
Change in value of derivative warrant liabilities | $ (9,028,000) | $ 12,110,000
Private placement warrants |  |
Class of Warrant or Right [Line Items] |  |
Beginning balance | 14,685,000 |
Initial measurement on November 27, 2020 |  | 9,879,000
Change in value of derivative warrant liabilities |  | 4,806,000
Fair value as of December 31, 2020 |  | 14,685,000
Public |  |
Class of Warrant or Right [Line Items] |  |
Beginning balance | 18,975,000 |
Initial measurement on November 27, 2020 |  | 12,650,000
Change in value of derivative warrant liabilities |  | 6,325,000
Fair value as of December 31, 2020 |  | 18,975,000
Warrant Liabilities |  |
Class of Warrant or Right [Line Items] |  |
Beginning balance | $ 33,660,000 |
Initial measurement on November 27, 2020 |  | 22,529,000
Change in value of derivative warrant liabilities |  | 11,131,000
Fair value as of December 31, 2020 |  | $ 33,660,000

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- Definition Amount of initial classification of warrant liability. + References No definition available. + Details
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Namespace Prefix: | svsvu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of warrant liability current and non current. + References No definition available. + Details
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Namespace Prefix: | svsvu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Amount of expense (income) related to adjustment to fair value of warrant liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 25 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=109262497&loc=d3e20148-110875 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
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- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=us-gaap_PrivatePlacementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=svsvu_WarrantLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |