The number of securities into which each unit may be converted. For example, but not limited to, each unit may be converted into two shares of common stock.

No definition available.

+ Details

Name:	nmmc_UnitsNumberOfSecuritiesCalledByUnits
Namespace Prefix:	nmmc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_ValuationTechniqueAndInputDescriptionAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

+ Details

Name:	us-gaap_WarrantsAndRightsOutstandingMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

+ Details

Name:	us-gaap_WarrantsAndRightsOutstandingTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=nmmc_PublicWarrantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_WarrantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=nmmc_PublicWarrantAndPrivatePlacementWarrantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputSharePriceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputExpectedTermMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputExercisePriceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputRiskFreeInterestRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=nmmc_PrivatePlacementWarrantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputPriceVolatilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=nmmc_MeasurementInputProbabilityOfSuccessfulBusinessCombinationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

FAIR VALUE MEASUREMENTS, Key Inputs into Modified Black-Scholes Model (Details)	Dec. 31, 2021 $ / shares shares	Dec. 31, 2020 $ / shares	Sep. 22, 2020 $ / shares
Key Inputs into Modified Black-Scholes Model [Abstract]
Measurement input	5 years
Public Warrants [Member]
Key Inputs into Modified Black-Scholes Model [Abstract]
Number of securities to be called by each unit (in shares) \| shares	0.5
Class A Common Stock [Member]
Key Inputs into Modified Black-Scholes Model [Abstract]
Number of securities to be called by each unit (in shares) \| shares	1
Warrants [Member] \| Public Warrants and Private Placement Warrants [Member] \| Common Stock Price [Member]
Key Inputs into Modified Black-Scholes Model [Abstract]
Measurement input \| $ / shares	9.86	10.33	9.51
Warrants [Member] \| Public Warrants and Private Placement Warrants [Member] \| Expected Term [Member]
Key Inputs into Modified Black-Scholes Model [Abstract]
Measurement input	5 years 3 months	5 years 8 months 23 days	6 years
Warrants [Member] \| Public Warrants and Private Placement Warrants [Member] \| Exercise Price [Member]
Key Inputs into Modified Black-Scholes Model [Abstract]
Measurement input \| $ / shares	11.50	11.50	11.50
Warrants [Member] \| Public Warrants and Private Placement Warrants [Member] \| Risk Free Rate of Interest [Member]
Key Inputs into Modified Black-Scholes Model [Abstract]
Measurement input	0.0128	0.0047	0.0036
Warrants [Member] \| Private Placement Warrants [Member] \| Expected Volatility [Member]
Key Inputs into Modified Black-Scholes Model [Abstract]
Measurement input	0.1255	0.1734	0.1740
Warrants [Member] \| Private Placement Warrants [Member] \| Estimated Probability of Successful Business Combination [Member]
Key Inputs into Modified Black-Scholes Model [Abstract]
Measurement input	1.0000	1.0000	1.0000