Class of Warrant Or Right, Gross Proceeds And Issued Warrants, Commission Percentage

No definition available.

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

- Definition

Sale Of Stock, Estimated Issuance Costs

+ References

No definition available.

+ Details

Name:	mnts_SaleOfStockEstimatedIssuanceCosts
Namespace Prefix:	mnts_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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
-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 from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

+ References

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

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfWarrants
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

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

- Definition

Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

+ 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_WarrantsAndRightsOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

+ Details

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

- 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_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:

Stockholders' Equity (Deficit) - December 2024 Securities Purchase Agreement (Details) - USD ($) $ / shares in Units, $ in Thousands							6 Months Ended
	Mar. 21, 2025	Feb. 11, 2025	Dec. 17, 2024	Sep. 15, 2024	Mar. 04, 2024	Jan. 12, 2024	Jun. 30, 2025	Jun. 30, 2024	Mar. 20, 2025
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
Estimated issuance costs			500
Proceeds from issuance of warrants			$ 4,400	$ 2,400			$ 572	$ 0
Pre-Funded Warrants
Class of Warrant or Right [Line Items]
Number of warrants exercised on net basis (in shares)		973,886	40,000
Class of warrant or right, gross proceeds and issued warrants percentage (as percent)			7.00%
Common Warrant
Class of Warrant or Right [Line Items]
Number of warrants exercised on net basis (in shares)		1,273,886
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
Class of warrant or right, gross proceeds and issued warrants percentage (as percent)				7.00%
Fair value of warrants			$ 300	$ 100
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
Number of warrants exercised on net basis (in shares)				714,286
Exercise price (in dollars per share)	$ 1.93		$ 6.08				$ 8,050		$ 3.80
Warrants and rights outstanding, term (in years)							5 years
Common Class A \| December 2024 Purchase Agreement
Class of Warrant or Right [Line Items]
Shares issued (in dollars per share)			$ 6.20
Number of warrants exercised on net basis (in shares)			367,000
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 \| 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