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Warrants - Fair value of warrant liabilities (Details) - Private warrants $ in Thousands | 9 Months Ended
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Sep. 30, 2022 USD ($)
Changes in the fair value of warrants liability: |
Warrants liability as at December 31, 2021 | $ 3,126
Decrease in fair value of warrants liability | (892)
Warrants liability as at September 30, 2022 | $ 2,234

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- Definition Amount of increase (decrease) of financial instrument classified as a liabilities measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References No definition available. + Details
Name: | tmc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringAndNonrecurringBasisLiabilityGainLoss
Namespace Prefix: | tmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Fair value of financial instrument classified as a liabilities measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References No definition available. + Details
Name: | tmc_FairValueMeasurementWithUnobservableInputsReconciliationRecurringAndNonrecurringBasisLiabilityValue
Namespace Prefix: | tmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_PrivatePlacementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |