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Collaboration and License Agreements - Ginkgo Agreement (Details) - Ginkgo Agreement - USD ($) $ in Millions			12 Months Ended
	Jan. 03, 2022	Oct. 25, 2021	Dec. 31, 2023	Dec. 31, 2022
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Clinical and commercial milestone payment, expected	$ 207.0	$ 85.0
Milestone payment			$ 1.0	$ 0.5
Collaborative arrangement, number of shares issued for milestone achievement (in shares)			44,642	29,761
Collaborative arrangement, shares issued for milestone achievement, amount			$ 1.5	$ 1.0

X

- Definition

Collaborative Arrangement, Number Of Shares Issued For Milestone Achievement

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Collaborative Arrangement, Shares Issued For Milestone Achievement, Amount

+ References

No definition available.

+ Details

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Namespace Prefix:	rnac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- Definition

License And Option Agreement, Clinical And Commercial Milestone Payment, Expected

+ References

No definition available.

+ Details

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Namespace Prefix:	rnac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

License And Option Agreement, Milestone Payments

+ References

No definition available.

+ Details

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Namespace Prefix:	rnac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 808
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479402/808-10-50-1

+ Details

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- Details

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