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Document and Entity Information
Jun. 10, 2020
Cover [Abstract]  
Amendment Flag false
Entity Central Index Key 0001217234
Document Type 8-K
Document Period End Date Jun. 10, 2020
Entity Registrant Name CAREDX, INC.
Entity Incorporation State Country Code DE
Entity File Number 001-36536
Entity Tax Identification Number 94-3316839
Entity Address, Address Line One 1 Tower Place
Entity Address, City or Town South San Francisco
Entity Address, State or Province CA
Entity Address, Postal Zip Code 94080
City Area Code (415)
Local Phone Number 287-2300
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, $0.001 Par Value
Trading Symbol CDNA
Security Exchange Name NASDAQ
Entity Emerging Growth Company false