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Document and Entity Information - shares
6 Months Ended
Jun. 30, 2019
Jul. 30, 2019
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Trading Symbol CDNA  
Entity Registrant Name CareDx, Inc.  
Entity Central Index Key 0001217234  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Ex Transition Period true  
Entity Shell Company false  
Entity Address, State or Province California  
Entity Address, Country US  
Entity Common Stock, Shares Outstanding   42,383,761
Entity File Number 001-36536  
Entity Tax Identification Number 943316839  
Entity Address, Address Line One 3260 Bayshore Boulevard  
Entity Address, City or Town Brisbane  
Entity Address, Postal Zip Code 94005  
City Area Code 415  
Local Phone Number 287-2300  
Entity Current Reporting Status Yes