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Commitments and Contingencies - Additional Information (Details)	3 Months Ended
	Mar. 31, 2026 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Office space noncancelable operating lease expiration date	2029
Loss related to indemnification obligations	$ 0

X

- Definition

Noncancelable operating lease expiration date.

+ References

No definition available.

+ Details

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Namespace Prefix:	cadl_
Data Type:	xbrli:gYearItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

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X

- Definition

The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 450
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483076/450-20-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (j)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476148/220-40-50-22

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