Class of Warrant or Right, Beneficially Owned To Exceed Percentage

No definition available.

Name:	mnts_ClassOfWarrantOrRightBeneficiallyOwnedToExceedPercentage
Namespace Prefix:	mnts_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Class Of Warrant Or Right, Offering Fees And Other Expenses Payable

+ References

No definition available.

+ Details

Name:	mnts_ClassOfWarrantOrRightOfferingFeesAndOtherExpensesPayable
Namespace Prefix:	mnts_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-3

+ Details

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

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

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-3

+ Details

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

- 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
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

+ Details

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

- Definition

The cash inflow associated with the amount received from holders exercising their stock warrants.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 14
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-14

+ Details

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

- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

No definition available.

+ Details

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

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- 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
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

+ Details

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

- Details

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

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=mnts_December2025WarrantInducementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=mnts_December2025WarrantInducementImmediatelyExercisableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=mnts_December2025WarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=mnts_October2025WarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Stockholders' Equity (Deficit) - December 2025 Warrant Inducement (Details) - USD ($) $ / shares in Units, $ in Thousands														12 Months Ended
	Dec. 12, 2025	Dec. 09, 2025	Oct. 20, 2025	Oct. 14, 2025	Oct. 10, 2025	Sep. 08, 2025	Jul. 01, 2025	Mar. 21, 2025	Mar. 20, 2025	Feb. 11, 2025	Dec. 17, 2024	Mar. 04, 2024	Jan. 12, 2024	Dec. 31, 2025	Dec. 31, 2024	Sep. 25, 2025	Aug. 13, 2025	Oct. 24, 2024	Sep. 15, 2024
Class of Warrant or Right [Line Items]
Exercise price (in dollars per share)										$ 77.07	$ 121.74		$ 239.90
Aggregate cost	$ 17,400	$ 3,700	$ 13,000		$ 9,200			$ 2,100			$ 5,000	$ 4,000	$ 4,000
Offering fees and other expenses payable		$ 300		$ 500				$ 200
Proceeds from exercise of warrants				$ 7,100					$ 1,900					$ 15,574	$ 0
Change in fair value of warrant liability						$ 600								$ (2,330)	$ 0
Number of warrants exercised on net basis (in shares)																		20,009
Warrants and rights outstanding, term (in years)							5 years			5 years	5 years
Common Class A
Class of Warrant or Right [Line Items]
Number of shares sold (in shares)							38,096	60,025		16,807	12,886	5,283	3,602
Exercise price (in dollars per share)								$ 34.45	$ 67.83		$ 108.53			$ 143,693
Number of warrants exercised on net basis (in shares)				418,466												37,816			40,017
Warrants and rights outstanding, term (in years)														5 years
December 2025 Warrant Inducement
Class of Warrant or Right [Line Items]
Number of shares sold (in shares)		272,385
Exercise price (in dollars per share)		$ 13.74
Proceeds from exercise of warrants		$ 3,400
Change in fair value of warrant liability		$ 1,500
Warrants and rights outstanding, term (in years)		5 years
Class of warrant or right, beneficially owned to exceed percentage (as percent)		4.99%
December 2025 Warrant Inducement, Immediately Exercisable
Class of Warrant or Right [Line Items]
Exercise price (in dollars per share)		$ 19.81
December 2025 Warrants
Class of Warrant or Right [Line Items]
Number of warrants exercised on net basis (in shares)																	408,577
Warrants and rights outstanding, term (in years)																	5 years
October 2025 Warrants
Class of Warrant or Right [Line Items]
Warrants and rights outstanding, term (in years)				5 years
October 2025 Warrants \| Common Class A
Class of Warrant or Right [Line Items]
Exercise price (in dollars per share)				$ 25.53