XML 127 R103.htm IDEA: XBRL DOCUMENT
v3.21.2

Equity-Based Compensation (Details) - Schedule of fair value of unit options issued | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Expected volatility | 59.50% | 55.00%
Expected term (years) | 6 years 3 months | 6 years 3 months
Expected dividends | 0.00% | 0.00%
Risk-free rate | 0.65% |
Minimum [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Risk-free rate |  | 1.30%
Maximum [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Risk-free rate |  | 3.10%

X
- Definition Expected dividends. + References No definition available. + Details
Name: | nn_ExpectedDividends
Namespace Prefix: | nn_
Data Type: | dtr:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Expected term (years). + References No definition available. + Details
Name: | nn_ExpectedTermyears
Namespace Prefix: | nn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Expected volatility + References No definition available. + Details
Name: | nn_ExpectedVolatilities
Namespace Prefix: | nn_
Data Type: | dtr:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Risk-free rate. + References No definition available. + Details
Name: | nn_RiskfreeRate
Namespace Prefix: | nn_
Data Type: | dtr:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |