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Equity - Warrants (Narrative) (Details)	6 Months Ended
	Jun. 30, 2025 shares
Equity [Abstract]
Warrants issued (in shares)	0
Warrants exercised (in shares)	0
Warrants cancelled (in shares)	0

X

- Definition

Class of Warrant Or Right, Outstanding, Warrants Cancelled

+ References

No definition available.

+ Details

Name:	rnac_ClassOfWarrantOrRightOutstandingWarrantsCancelled
Namespace Prefix:	rnac_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Class of Warrant Or Right, Outstanding, Warrants Exercised

+ References

No definition available.

+ Details

Name:	rnac_ClassOfWarrantOrRightOutstandingWarrantsExercised
Namespace Prefix:	rnac_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Class of Warrant Or Right, Outstanding, Warrants Issued

+ References

No definition available.

+ Details

Name:	rnac_ClassOfWarrantOrRightOutstandingWarrantsIssued
Namespace Prefix:	rnac_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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