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

Class Of Warrant Or Right, Warrants Exercised

+ References

No definition available.

+ Details

Name:	mnts_ClassOfWarrantOrRightWarrantsExercised
Namespace Prefix:	mnts_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- 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

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

+ 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

Reference 2: 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 3: 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

+ 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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-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_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

+ 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_SubsidiarySaleOfStockAxis=mnts_July2025PublicOfferingMember
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_July2025PublicOfferingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=mnts_August2025WarrantInducementImmediatelyExercisableMember
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:

Stockholders' Equity - July 2025 Public Offering (Details) - USD ($) $ / shares in Units, $ in Thousands										3 Months Ended		6 Months Ended
	Feb. 09, 2026	Feb. 06, 2026	Dec. 31, 2025	Dec. 09, 2025	Oct. 14, 2025	Jul. 01, 2025	Mar. 21, 2025	Mar. 20, 2025	Feb. 11, 2025	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Sep. 25, 2025	Aug. 13, 2025	Dec. 17, 2024	Oct. 24, 2024	Sep. 15, 2024
Class of Warrant or Right [Line Items]
Class of warrant or right, number of securities called by warrants or rights (in shares)																	20,009
Exercise price (in dollars per share)									$ 77.07
Warrants and rights outstanding, term (in years)						5 years			5 years							5 years
Aggregate cost	$ 50,000	$ 21,600	$ 17,400	$ 3,700			$ 2,100
Offering fees and other expenses payable				$ 300	$ 500		$ 200
Proceeds from exercise of warrants					7,100			$ 1,900				$ 9,638	$ 2,068
Common stock equivalents, period						45 days			30 days
Change in fair value of warrant liability					$ 600					$ 123	$ 0	$ 123	$ 0
July 2025 Public Offering
Class of Warrant or Right [Line Items]
Aggregate cost						$ 4,000
Offering fees and other expenses payable						600
Proceeds from exercise of warrants						$ 3,400
Pre-Funded Warrants
Class of Warrant or Right [Line Items]
Class of warrant or right, number of securities called by warrants or rights (in shares)						120,834			54,560
Common Warrant
Class of Warrant or Right [Line Items]
Class of warrant or right, number of securities called by warrants or rights (in shares)						158,925			71,367
July 2025 Public Offering
Class of Warrant or Right [Line Items]
Warrants exercised (in shares)						64,826
Change in fair value of warrant liability						$ 400
August 2025 Warrant Inducement, Immediately Exercisable
Class of Warrant or Right [Line Items]
Exercise price (in dollars per share)						$ 25.17									$ 67.83
Common Class A
Class of Warrant or Right [Line Items]
Number of shares sold (in shares)						38,096	60,025		16,807
Offering price for prefunded warrants (in dollars per share)						$ 25.17			$ 70.06
Class of warrant or right, number of securities called by warrants or rights (in shares)					418,465									37,816				40,017
Exercise price (in dollars per share)							$ 34.45	$ 67.83								$ 108.53
Warrants and rights outstanding, term (in years)										5 years		5 years
Common Class A \| Pre-Funded Warrants
Class of Warrant or Right [Line Items]
Exercise price (in dollars per share)						0.00001			0.00001
Common Class A \| Common Warrant
Class of Warrant or Right [Line Items]
Class of warrant or right, number of securities called by warrants or rights (in shares)																44,818
Exercise price (in dollars per share)						$ 25.17			$ 67.83