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INCOME TAXES - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Operating Loss Carryforwards [Line Items]      
Cash and cash equivalents $ 48,719 $ 65,594 $ 91,830
Income tax expense (benefit) 0 0 0
Release of valuation allowance 0 0 $ 0
Federal      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards 690,000 631,600  
Federal | Research and Development Tax Credit Carryforward      
Operating Loss Carryforwards [Line Items]      
Tax credits 15,700 14,200  
State      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards 302,000 269,100  
Foreign      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards 53,600 $ 50,000  
Foreign | Cardlytics UK      
Operating Loss Carryforwards [Line Items]      
Cash and cash equivalents $ 5,000