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Moderna Collaboration and License Agreement - Schedule of Estimated Revenue Expected to be Recognized in The Future Related to Performance Obligations (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Performance obligations:
Option rights	$ 41,250	$ 41,250

X

- Definition

Amount of transaction price allocated to option rights performance obligation that has not been recognized as revenue.

+ References

No definition available.

+ Details

Name:	carm_RevenueRemainingPerformanceObligationOptionRightsAmount
Namespace Prefix:	carm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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