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SUMMARY OF MATERIAL ACCOUNTING POLICIES (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Disclosure Of Significant Accounting Policies [Abstract]
Convertible loan facility	$ 12,693	$ 13,588

X

- Definition

The amount of current borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_ShorttermBorrowings
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	mta_DisclosureOfSignificantAccountingPoliciesAbstract
Namespace Prefix:	mta_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration