Sale Of Stock, Remaining Consideration Available

No definition available.

Name:	mnts_SaleOfStockRemainingConsiderationAvailable
Namespace Prefix:	mnts_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow for cost incurred directly with the issuance of an equity security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-15

+ Details

Name:	us-gaap_PaymentsOfStockIssuanceCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481674/830-30-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483399/855-10-50-2

+ Details

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

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=mnts_ATMSalesAgreementMember
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_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Subsequent Events (Details) - USD ($) $ in Thousands									2 Months Ended	3 Months Ended	6 Months Ended
Subsequent Events (Details) - USD ($) $ in Thousands	Feb. 09, 2026	Feb. 06, 2026	Dec. 31, 2025	Dec. 09, 2025	Sep. 19, 2025	Jul. 01, 2025	Mar. 21, 2025	Feb. 11, 2025	Aug. 31, 2026	Jun. 30, 2026	Jun. 30, 2026	Jun. 30, 2025
Subsequent Event [Line Items]
Aggregate cost	$ 50,000	$ 21,600	$ 17,400	$ 3,700			$ 2,100
Agent fees and other offering costs											$ 5,925	$ 598
ATM Sales Agreement
Subsequent Event [Line Items]
Aggregate cost					$ 7,400						47,000
Agent fees and other offering costs										$ 1,100	$ 1,500
Common Class A
Subsequent Event [Line Items]
Number of shares sold (in shares)						38,096	60,025	16,807
Common Class A \| ATM Sales Agreement
Subsequent Event [Line Items]
Number of shares sold (in shares)										5,806,465	8,010,080
Aggregate cost											$ 64,400
Subsequent Event \| ATM Sales Agreement
Subsequent Event [Line Items]
Aggregate cost									$ 6,400
Agent fees and other offering costs									200
Remaining principal available									$ 58,000
Subsequent Event \| Common Class A \| ATM Sales Agreement
Subsequent Event [Line Items]
Number of shares sold (in shares)									1,500,000