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Fair Value (Details) - Schedule of liabilities measured at fair value $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Warrants:
Balance as of December 31, 2022	$ 4,200
Fair value adjustment of Private Placement Warrants	9,800
Balance as of September 30, 2023	$ 14,000

X

- 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

X

- References

No definition available.

+ Details

Name:	nn_WarrantsAbstract
Namespace Prefix:	nn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-SubTopic 10
-Topic 820
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant