XML 66 R47.htm IDEA: XBRL DOCUMENT
v3.21.2

Summary of Significant Accounting Policies (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 5 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 19, 2020 | Jan. 31, 2020 | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |
Warrants |  | $ 200,000 |  |  | $ 38,841,000 | $ 739,000 | $ 97,604,000 |
Fair value of quote price (in Dollars per share) |  |  | $ 1.24 | $ 1.12 | $ 1.24 |  | $ 1.12 |
Federal depository insurance coverage |  |  |  |  | $ 250,000 |  |  |
Offering costs |  |  | $ 4,630,000 |  | $ 4,630,000 |  |  |
Warrants exercisable to purchase (in Shares) |  |  |  |  | 18,750,000 |  |  |
Temporary equity (in Shares) |  |  | 16,214,818 |  | 16,214,818 |  |  |
Spartacus Acquisition Corp [Member] |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |
Assets held in the trust account | $ 203,000,000 |  | $ 203,000,000 |  | $ 203,000,000 |  |  |
Warrants |  |  | $ 8,275,000 | $ 2,975,000 | $ 1,812,500 |  |  |
Fair value of quote price (in Dollars per share) |  |  |  | $ 1.12 |  |  | $ 1.12 |
Federal depository insurance coverage |  |  |  | $ 250,000 |  |  |  |
Other offering expenses | 604,606 |  |  |  |  |  |  |
Warrants exercisable to purchase (in Shares) |  |  |  | 18,750,000 |  |  |  |
Spartacus Acquisition Corp [Member] | US Treasury Securities [Member] |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |
Assets held in the trust account |  |  |  | $ 5,071 |  |  | $ 5,071 |
Money market funds |  |  |  | 203,023,911 |  |  | $ 203,023,911 |
Spartacus Acquisition Corp [Member] | Offering Costs [Member] |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |
Offering costs | 11,516,309 |  |  |  |  |  |  |
Underwriters’ discount | 4,000,000 |  |  |  |  |  |  |
Deferred underwriters’ discount | 7,000,000 |  |  |  |  |  |  |
Other offering expenses | $ 516,309 |  |  |  |  |  |  |
Public Warrants [Member] |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |
Warrants outstanding (in Shares) |  |  |  |  | 10,000,000 |  |  |
Public Warrants [Member] | Spartacus Acquisition Corp [Member] |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |
Warrants |  |  |  | 10,000,000 |  |  |  |
Private Placement Warrants outstanding [Member] |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |
Warrants outstanding (in Shares) |  |  |  |  | 8,750,000 |  |  |
Private Placement Warrants outstanding [Member] | Spartacus Acquisition Corp [Member] |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies (Details) [Line Items] |  |  |  |  |  |  |  |
Warrants |  |  |  | $ 8,750,000 |  |  |  |

X
- References No definition available. + Details
Name: | nn_DeferredUnderwritersDiscount
Namespace Prefix: | nn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of expense for Federal Deposit Insurance Corporation (FDIC) insurance. + References No definition available. + Details
Name: | nn_FederalDepositoryInsuranceCoverage
Namespace Prefix: | nn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Offering costs. + References No definition available. + Details
Name: | nn_OfferingCosts
Namespace Prefix: | nn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Quote price. + References No definition available. + Details
Name: | nn_QuotePrice
Namespace Prefix: | nn_
Data Type: | dtr:perShareItemType
Balance Type: | na
Period Type: | instant

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

X
- References No definition available. + Details
Name: | nn_UnderwritingDiscount
Namespace Prefix: | nn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition Weighted average shares. + References No definition available. + Details
Name: | nn_WeightedAverageNumberOfSharesCommonStock
Namespace Prefix: | nn_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of cash, securities, or other assets held by a third-party trustee pursuant to the terms of an agreement which assets are available to be used by beneficiaries to that agreement only within the specific terms thereof and which agreement is expected to terminate within one year of the balance sheet date (or operating cycle, if longer) at which time the assets held-in-trust will be released or forfeited. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(b)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
Name: | us-gaap_AssetsHeldInTrustCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Specific incremental costs directly attributable to a proposed or actual offering of securities which are deferred at the end of the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.A) -URI http://asc.fasb.org/extlink&oid=122040515&loc=d3e105025-122735 + Details
Name: | us-gaap_DeferredOfferingCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of deposits in accounts that offer many of the same services as checking accounts although transactions may be somewhat more limited, share some of the characteristics of a money market fund and are insured by the Federal government, also known as money market accounts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
Name: | us-gaap_DepositsMoneyMarketDeposits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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=123570139&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
Name: | us-gaap_FairValueAdjustmentOfWarrants
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The number of securities classified as temporary equity that have been allocated to investors to buy. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: 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(27)(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_TemporaryEquityShareSubscriptions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=nn_SpartacusAcquisitionCorpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CashAndCashEquivalentsAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=nn_OfferingCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=nn_PublicWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=nn_PrivatePlacementWarrantsOutstandingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |