Number of warrants or rights issued during the period.

No definition available.

Name:	nmmc_ClassOfWarrantOrRightIssued
Namespace Prefix:	nmmc_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of other offering expenses incurred directly with the issuance of warrant liabilities.

+ References

No definition available.

+ Details

Name:	nmmc_OtherOfferingExpensesRelatedToWarrantLiabilities
Namespace Prefix:	nmmc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

Name:	nmmc_PrivatePlacementWarrantsAbstract
Namespace Prefix:	nmmc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of securities into which each warrant or right may be converted. For example, but not limited to, each warrant may be converted into two shares.

+ References

No definition available.

+ Details

Name:	us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByEachWarrantOrRight
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash inflow associated with the amount received from entity's raising of capital via private rather than public placement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfPrivatePlacement
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

+ Details

Name:	us-gaap_SharePrice
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Per share or per unit amount of equity securities issued.

+ References

No definition available.

+ Details

Name:	us-gaap_SharesIssuedPricePerShare
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_PrivatePlacementMember
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_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

PRIVATE PLACEMENT (Details) - USD ($)		6 Months Ended	12 Months Ended
PRIVATE PLACEMENT (Details) - USD ($)	Sep. 22, 2020	Dec. 31, 2020	Dec. 31, 2021	Sep. 17, 2020
Private Placement Warrants [Abstract]
Gross proceeds from issuance of private placement warrants		$ 4,145,000	$ 0
Fair market value of warrants (in dollars per share)				$ 10.00
Other offering expense related to warrant liabilities		$ (55,000)	$ 0
Private Placement [Member] \| Private Placement Warrants [Member]
Private Placement Warrants [Abstract]
Warrants issued (in shares)	4,145,000
Share price (in dollars per share)	$ 1.00
Gross proceeds from issuance of private placement warrants	$ 4,145,000
Fair market value of warrants (in dollars per share)	$ 1.01
Private Placement [Member] \| Class A Common Stock [Member] \| Private Placement Warrants [Member]
Private Placement Warrants [Abstract]
Number of securities called by each warrant (in shares)			1
Warrants exercise price (in dollars per share)			$ 11.50