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Fair Value (Details) - Schedule of liabilities measured at fair value $ in Thousands | 6 Months Ended
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Jun. 30, 2022 USD ($)
Warrants: |
Balance as of December 31, 2021 | $ 28,875
Fair value adjustment of Private Placement Warrants | (24,150)
Balance as of March 31, 2022 | $ 4,725

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- Definition Amount of expense (income) related to adjustment to fair value of private placement warrants. + References No definition available. + Details
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Namespace Prefix: | nn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | nn_WarrantsAbstract
Namespace Prefix: | nn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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Balance Type: | credit
Period Type: | instant