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Document and Entity Information
Mar. 02, 2021
Sep. 30, 2020
Entity Information [Line Items]    
Document Type 8-K  
Amendment Flag   false
Document Period End Date Mar. 02, 2021  
Entity Registrant Name CARDLYTICS, INC.  
Entity Central Index Key   0001666071
Entity Emerging Growth Company false  
Entity Incorporation, State or Country Code DE  
Entity File Number 001-38386  
Entity Tax Identification Number 26-3039436  
Entity Address, Address Line One 675 Ponce de Leon Avenue NE, Suite 6000  
Entity Address, City or Town Atlanta  
Entity Address, State or Province GA  
Entity Address, Postal Zip Code 30308  
City Area Code (888)  
Local Phone Number 798-5802  
Written Communications false  
Soliciting Material false  
Pre-commencement Tender Offer false  
Title of 12(b) Security Common Stock  
Security Exchange Name NASDAQ  
Pre-commencement Issuer Tender Offer false  
Entity Registrant Name CDLX