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

No definition available.

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

- Definition

Offering Price Per Share For Warrants

+ References

No definition available.

+ Details

Name:	mnts_OfferingPricePerShareForWarrants
Namespace Prefix:	mnts_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Sale Of Stock, Not Entering Additional Agreements, Period

+ References

No definition available.

+ Details

Name:	mnts_SaleOfStockNotEnteringAdditionalAgreementsPeriod
Namespace Prefix:	mnts_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Sale Of Stock, Placement Agent Cash Fee, Percentage Of Gross Proceeds

+ References

No definition available.

+ Details

Name:	mnts_SaleOfStockPlacementAgentCashFeePercentageOfGrossProceeds
Namespace Prefix:	mnts_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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

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_SubsidiarySaleOfStockAxis=mnts_February2025PublicOfferingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=mnts_SIVConvertiblePromissoryNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_ConvertibleDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

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

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=mnts_PlacementAgentWarrantsMember
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_ClassOfWarrantOrRightAxis=mnts_December2024PurchaseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

Stockholders' Equity (Deficit) - February 2025 Public Offering (Details) - USD ($) $ / shares in Units, $ in Thousands								6 Months Ended
	Mar. 21, 2025	Mar. 20, 2025	Feb. 11, 2025	Dec. 17, 2024	Sep. 15, 2024	Mar. 04, 2024	Jan. 12, 2024	Jun. 30, 2025	Jun. 30, 2024	Oct. 24, 2024
Class of Warrant or Right [Line Items]
Exercise price (in dollars per share)			$ 4.3175	$ 6.82			$ 13.44
Warrants and rights outstanding, term (in years)			5 years	5 years
Aggregate cost	$ 2,100			$ 5,000	$ 2,800	$ 4,000	$ 4,000
Offering fees and other expenses payable	$ 200
Proceeds from exercise of warrants		$ 1,900						$ 2,068	$ 0
Common stock equivalents, period			30 days
Placement agent cash fee, percentage of gross proceeds			7.00%
February 2025 Public Offering
Class of Warrant or Right [Line Items]
Aggregate cost			$ 5,000
Offering fees and other expenses payable			600
Proceeds from exercise of warrants			$ 4,400
Convertible promissory notes \| Convertible Debt
Class of Warrant or Right [Line Items]
Number of warrants exercised on net basis (in shares)										357,143
Pre-Funded Warrants
Class of Warrant or Right [Line Items]
Number of warrants exercised on net basis (in shares)			973,886	40,000
Common Warrant
Class of Warrant or Right [Line Items]
Number of warrants exercised on net basis (in shares)			1,273,886
September Prefunded Warrants
Class of Warrant or Right [Line Items]
Exercise price (in dollars per share)					$ 0.00001
Placement Agent Warrants
Class of Warrant or Right [Line Items]
Number of warrants exercised on net basis (in shares)			63,694
Warrants and rights outstanding, term (in years)				5 years
Common Class A
Class of Warrant or Right [Line Items]
Number of shares sold (in shares)	1,071,429		300,000	230,000		94,286	64,286
Offering price for prefunded warrants (in dollars per share)			$ 3.925
Number of warrants exercised on net basis (in shares)					714,286
Exercise price (in dollars per share)	$ 1.93	$ 3.80		$ 6.08				$ 8,050
Warrants and rights outstanding, term (in years)								5 years
Common Class A \| Pre-Funded Warrants
Class of Warrant or Right [Line Items]
Number of warrants exercised on net basis (in shares)				570,000
Exercise price (in dollars per share)			0.00001	$ 0.00001
Common Class A \| Common Warrant
Class of Warrant or Right [Line Items]
Number of warrants exercised on net basis (in shares)				800,000
Exercise price (in dollars per share)			$ 3.80
Common Class A \| December 2024 Purchase Agreement
Class of Warrant or Right [Line Items]
Number of warrants exercised on net basis (in shares)				367,000
Common Class A \| September Prefunded Warrants
Class of Warrant or Right [Line Items]
Number of warrants exercised on net basis (in shares)					357,143
Exercise price (in dollars per share)					$ 8.05
Common Class A \| Placement Agent Warrants
Class of Warrant or Right [Line Items]
Number of warrants exercised on net basis (in shares)					17,857
Exercise price (in dollars per share)					$ 8.8550
Common Class B
Class of Warrant or Right [Line Items]
Number of warrants exercised on net basis (in shares)					357,143
Warrants and rights outstanding, term (in years)								1 year 6 months
Common Class B \| Placement Agent Warrants
Class of Warrant or Right [Line Items]
Number of warrants exercised on net basis (in shares)					17,858