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Leases - Narrative (Details) | 12 Months Ended
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Dec. 31, 2023 lease_renewal
Leases [Abstract] |
Number of finance renewals (or more) | 1
Number of operating renewals (or more) | 1
New lease term | 12 years 6 months

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- Definition Lessee, Finance Lease, Number of Renewals + References No definition available. + Details
Name: | matv_LesseeFinanceLeaseNumberOfRenewals
Namespace Prefix: | matv_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Lessee, Operating Lease, Number of Renewals + References No definition available. + Details
Name: | matv_LesseeOperatingLeaseNumberOfRenewals
Namespace Prefix: | matv_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of lessee's operating lease not yet commenced, 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 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-3 + Details
Name: | us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant