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Income Taxes (Details) $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($)
Income Tax Disclosure [Abstract]
Tax revenue related to Moderna cash received	$ 45.0

X

- Definition

The amount of tax revenue related to Moderna cash received.

+ References

No definition available.

+ Details

Name:	carm_TaxRevenueRelatedToCollaborationAndLicenseAgreementWithRelatedParty
Namespace Prefix:	carm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

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