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Income Taxes - Additional information (Details) $ in Thousands	Dec. 31, 2024 USD ($)
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