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Warrants - Fair value of warrant liabilities (Details) - Private Warrants $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($)
Share-based compensation
Warrants liability as at December 31, 2023	$ 1,969
Decrease in fair value of warrants liability	1,057
Warrants liability as at December 31, 2024	$ 912

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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

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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

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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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: