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Convertible Preferred Stock - Voting (Narrative) (Details)	Dec. 31, 2024
Temporary Equity Disclosure [Abstract]
Preferred stock, convertible, transaction restrictions, percentage of originally issued stock issued and outstanding	30.00%

X

- Definition

Preferred Stock, Convertible, Transaction Restrictions, Percentage Of Originally Issued Stock Issued And Outstanding

+ References

No definition available.

+ Details

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Namespace Prefix:	rnac_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

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