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v3.22.2.2

Subsequent Events (Details) - Subsequent event - PMTS Agreement Amendment [Member] $ / shares in Units, $ in Millions | Nov. 11, 2022 USD ($) $ / shares
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Subsequent Event |
Final Payment | $ 10.0
Issuance Of Common share | $ / shares | $ 1.00
Allseas Warrants |
Subsequent Event |
Final Payment | $ 11.6
Warrants Vested to exercisable | $ 11.6

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- Definition Represent To Information of Issuance Of Common share. + References No definition available. + Details
Name: | tmc_IssuanceOfCommonShare
Namespace Prefix: | tmc_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Represent to Information of Settlement Of final Payment. + References No definition available. + Details
Name: | tmc_SettlementOfFinalPayment
Namespace Prefix: | tmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represent to Information of Warrants Vested to exercisable. + References No definition available. + Details
Name: | tmc_WarrantsVestedToExercisable
Namespace Prefix: | tmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=tmc_PmtsAgreementAmendmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=tmc_AllseasWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |