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REVENUE - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Revenue from Contract with Customer [Abstract] |  |  |  |
Consumer incentives, expense | $ 28.6 | $ 40.8 | $ 52.4 | $ 76.5

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- Definition Consumer Incentives, Expense + References No definition available. + Details
Name: | cdlx_ConsumerIncentivesExpense
Namespace Prefix: | cdlx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration