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LOANS PAYABLE - Disclosure of detailed information about loans payable (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Loan Payable [Line Items] |  |
Opening balance | $ 13,725 |
Interest expense | 1,977 | $ 1,170
Interest payments | (58) | (809)
Ending balance | 12,625 | 13,725
Loans Payable [Member] |  |
Loan Payable [Line Items] |  |
Opening balance | 14,286 | 10,585
Additions |  | 11,064
Conversion | (1,109) | (2,737)
Extinguishment of loan facility |  | 233
Modification of loan facility |  | (311)
Interest expense | 1,771 | 1,019
Interest payments | (58) | (809)
Principal repayment | (660) | (4,340)
Fair value adjustment of derivative portion | (493) | (673)
Foreign exchange adjustments | (1,044) | 255
Ending balance | 12,693 | 14,286
Loans Payable [Member] | A&R Loan Facility Debt Portion [Member] |  |
Loan Payable [Line Items] |  |
Opening balance | 13,027 | 5,335
Additions |  | 10,357
Conversion | (1,109) | (2,737)
Extinguishment of loan facility |  | (195)
Modification of loan facility |  | (410)
Interest expense | 1,751 | 771
Interest payments | 0 | (349)
Principal repayment | 0 | 0
Fair value adjustment of derivative portion | 0 | 0
Foreign exchange adjustments | (1,044) | 255
Ending balance | 12,625 | 13,027
Loans Payable [Member] | A&R Loan Facility Derivative Portion [Member] |  |
Loan Payable [Line Items] |  |
Opening balance | 561 | 0
Additions |  | 707
Conversion | 0 | 0
Extinguishment of loan facility |  | 428
Modification of loan facility |  | 99
Interest expense | 0 | 0
Interest payments | 0 | 0
Principal repayment | 0 | 0
Fair value adjustment of derivative portion | (493) | (673)
Foreign exchange adjustments | 0 | 0
Ending balance | 68 | 561
Loans Payable [Member] | Castle Mountain Loan [Member] |  |
Loan Payable [Line Items] |  |
Opening balance | 698 | 5,250
Additions |  | 0
Conversion | 0 | 0
Extinguishment of loan facility |  | 0
Modification of loan facility |  | 0
Interest expense | 20 | 248
Interest payments | (58) | (460)
Principal repayment | (660) | (4,340)
Fair value adjustment of derivative portion | 0 | 0
Foreign exchange adjustments | 0 | 0
Ending balance | $ 0 | $ 698

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- Definition The amount of outstanding funds that the entity is obligated to repay. + 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_Borrowings
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of expense arising from interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 28 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_28_e&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph B13 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_B13_f&doctype=Appendix&subtype=B -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 23 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_23_d&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_InterestExpense
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The cash outflow for interest paid, classified as financing activities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 31 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_31&doctype=Standard -URIDate 2024-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The cash outflow for repayments of current borrowings. [Refer: Current borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2024-01-01 -Paragraph 17 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_17&doctype=Standard -URIDate 2024-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents amount of additions to loan payable. + References No definition available. + Details
Name: | mta_AdditionsToLoanPayable
Namespace Prefix: | mta_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents conversion of loans payable during the period. + References No definition available. + Details
Name: | mta_ConversionLoansPayable
Namespace Prefix: | mta_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents amount of currency translation adjustments related to borrowing. + References No definition available. + Details
Name: | mta_CurrencyTranslationAdjustmentsRelatedToBorrowings
Namespace Prefix: | mta_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of Extinguishment of loan facility. + References No definition available. + Details
Name: | mta_ExtinguishmentOfLoanFacility
Namespace Prefix: | mta_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of Fair value adjustment of derivative portion. + References No definition available. + Details
Name: | mta_FairValueAdjustmentOfDerivativePortion
Namespace Prefix: | mta_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Definition Amount of Modification of loan facility. + References No definition available. + Details
Name: | mta_ModificationOfLoanFacility
Namespace Prefix: | mta_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | ifrs-full_AssetsAndLiabilitiesAxis=mta_LoansPayablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | mta_LoanPayableAxis=mta_AAndRLoanFacilityDebtPortionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | mta_LoanPayableAxis=mta_CastleMountainLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |