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Leases - Narrative (Details)	12 Months Ended
	Dec. 31, 2024 lease_renewal
Leases [Abstract]
Number of finance renewals (or more)	1
Number of operating renewals (or more)	1

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