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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 |  |

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