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Leases - Narrative (Details)	12 Months Ended
	Dec. 31, 2022 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

X

- 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

X

- 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

X

- References

No definition available.

+ Details

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

X

- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980

+ Details

Name:	us-gaap_LesseeOperatingLeaseLeaseNotYetCommencedTermOfContract1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant