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v3.25.1

Receivables and Prepayments (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Receivables and Prepayments |  |
Taxes and other receivables | $ 249 | $ 467
Prepayments | 1,602 | 1,511
Total | $ 1,851 | $ 1,978

X
- Definition Prepayments. + References No definition available. + Details
Name: | tmc_Prepayments
Namespace Prefix: | tmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Carrying amount as of the balance sheet date of taxes and receivables classified as other, due within one year or the operating cycle, if longer. + References No definition available. + Details
Name: | tmc_TaxesAndOtherReceivablesCurrent
Namespace Prefix: | tmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, after allowance, of receivables classified as other, due within one year or the operating cycle, if longer. + References No definition available. + Details
Name: | us-gaap_OtherReceivablesNetCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant