v3.19.3
Document and Entity Information - $ / shares
9 Months Ended
Sep. 30, 2019
Oct. 31, 2019
Dec. 31, 2018
Document Information [Line Items]      
Entity Shell Company false    
Document Transition Report false    
Document Quarterly Report true    
Title of 12(b) Security Common Stock    
Trading Symbol CDLX    
Entity Incorporation, State or Country Code DE    
Entity Registrant Name CARDLYTICS, INC.    
Security Exchange Name NASDAQ    
Document Type 10-Q    
Amendment Flag false    
Document Period End Date Sep. 30, 2019    
Entity Filer Category Accelerated Filer    
Entity Small Business true    
Entity File Number 001-38386    
Entity Current Reporting Status Yes    
Document Fiscal Year Focus 2019    
Entity Interactive Data Current Yes    
Entity Ex Transition Period false    
Document Fiscal Period Focus Q3    
Entity Emerging Growth Company true    
Current Fiscal Year End Date --12-31    
Entity Central Index Key 0001666071    
Entity Common Stock, Shares Outstanding (in shares)   25,711,713  
Entity Address, City or Town Atlanta    
Entity Address, Address Line One 675 Ponce de Leon Ave. NE, Ste 6000    
Entity Tax Identification Number 26-3039436    
Entity Address, State or Province GA    
Entity Address, Postal Zip Code 30308    
Common stock, par or stated value per share (in usd per share) $ 0.0001   $ 0.0001
Local Phone Number 792-5802    
City Area Code (888)