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v3.23.1

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