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v3.23.3

Income Taxes (Details) $ in Millions | 9 Months Ended
--- | ---
Sep. 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

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