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v3.25.2

Equity - Warrants (Narrative) (Details) | 6 Months Ended
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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
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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