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v3.25.1

Income Taxes - Additional information (Details) $ in Thousands | Dec. 31, 2024 USD ($)
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Income Taxes |
Uncertain tax position | $ 0

X
- Definition Amount of uncertain tax positions. + References No definition available. + Details
Name: | tmc_UncertainTaxPositions
Namespace Prefix: | tmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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