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Warrants - Additional Information (Detail) - shares	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Warrants and Rights Note Disclosure [Abstract]
Number of warrants exercised (in shares)	0	0

X

- Definition

Number of Warrants Exercised

+ References

No definition available.

+ Details

Name:	cdna_NumberOfWarrantsExercised
Namespace Prefix:	cdna_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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