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Government Funding - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Apr. 30, 2025	Feb. 27, 2024
Government Assistance [Line Items]
Government Funding				$ 99,750
Proceeds from government funding	$ 12,900	$ 0
Government assistance capital fundings	$ 13,900
Subsequent Event
Government Assistance [Line Items]
Government fund received			$ 5,100

X

- Definition

Government assistance capital fundings.

+ References

No definition available.

+ Details

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Namespace Prefix:	mtus_
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Balance Type:	credit
Period Type:	duration

X

- Definition

Government fund received,

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

Proceeds from government funding.

+ References

No definition available.

+ Details

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Namespace Prefix:	mtus_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of government assistance awarded that comprises amount received, receivable, and to be received unless condition for government assistance is not met. Includes, but is not limited to, government grant, assistance, incentive, award, subsidy, and loan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 832
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483507/832-10-50-3

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X

- 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/2003/role/disclosureRef
-Topic 832
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483507/832-10-50-3

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