v3.19.2
Document and Entity Information - $ / shares
6 Months Ended
Jun. 30, 2019
Jul. 31, 2019
Dec. 31, 2018
Document Information [Line Items]      
Document Transition Report false    
Document Quarterly Report true    
Title of 12(b) Security Common Stock    
Trading Symbol CDLX    
Security Exchange Name NASDAQ    
Common stock, par or stated value per share (in usd per share) $ 0.0001   $ 0.0001
Entity Incorporation, State or Country Code DE    
Entity Registrant Name CARDLYTICS, INC.    
Document Type 10-Q    
Amendment Flag false    
Document Period End Date Jun. 30, 2019    
Entity File Number 001-38386    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Shell Company true    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus Q2    
Entity Central Index Key 0001666071    
Current Fiscal Year End Date --12-31    
Entity Filer Category Accelerated Filer    
Entity Emerging Growth Company true    
Entity Small Business true    
Entity Ex Transition Period false    
Entity Common Stock, Shares Outstanding (in shares)   22,842,058  
Entity Tax Identification Number 26-3039436    
Entity Address, Address Line One 675 Ponce de Leon Ave. NE, Ste 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 792-5802