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Fair Value (Details) - Schedule of beginning and ending balances for the liabilities measured at fair value $ in Thousands | 6 Months Ended
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Jun. 30, 2021 USD ($)
Schedule of beginning and ending balances for the liabilities measured at fair value [Abstract] |
Balance | $ 101,325
Vesting of Vendor Warrants | 5,504
Fair value adjustment for Vendor Warrants | (11,722)
Fair value adjustment for Financing Warrants | 50,566
Balance | $ 145,673

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- Definition Amount of Fair value adjustment for Financing Warrants. + References No definition available. + Details
Name: | nn_FairValueAdjustmentForFinancingWarrants
Namespace Prefix: | nn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of Fair value adjustment for Vendor Warrants. + References No definition available. + Details
Name: | nn_FairValueAdjustmentForVendorWarrants
Namespace Prefix: | nn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of vesting of vendor warrants. + References No definition available. + Details
Name: | nn_FairValueOfVestingOfVendorWarrants
Namespace Prefix: | nn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | nn_ScheduleOfBeginningAndEndingBalancesForTheLiabilitiesMeasuredAtFairValueAbstract
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 http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant