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Cover - shares
 6 Months Ended
Jun. 30, 2025
Aug. 01, 2025
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
Document Transition Report false  
Entity File Number 001-36536  
Entity Registrant Name CAREDX, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 94-3316839  
Entity Address, Address Line One 8000 Marina Boulevard, 4th Floor  
Entity Address, City or Town Brisbane  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94005  
City Area Code 415  
Local Phone Number 287-2300  
Title of 12(b) Security Common Stock, par value $0.001 per share  
Trading Symbol CDNA  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   53,226,948
Amendment Flag false  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Entity Central Index Key 0001217234  
Current Fiscal Year End Date --12-31