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SEGMENTS - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 USD ($) segment | Jun. 30, 2021 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of operating segments | segment |  |  | 3 |
Capital expenditures |  |  | $ 889 | $ 1,790
Marketers | Revenue Benchmark | Top Five Marketers |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Concentration risk |  |  | 21.00% | 34.00%
Marketers | Accounts Receivable | Top Five Marketers |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Concentration risk |  |  | 19.00% | 30.00%
Marketers | Accounts Receivable | Largest Marketers |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Concentration risk | 10.00% | 10.00% |  |
Supplier Concentration Risk | Financial Institution Partner | Largest FI Partner |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Concentration risk |  |  |  | 75.00%
Supplier Concentration Risk | Financial Institution Partner | Bank Of America, National Association |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Concentration risk |  |  |  | 10.00%
Supplier Concentration Risk | Financial Institution Partner | JP Morgan Chase Bank, National Association |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Concentration risk |  |  |  | 10.00%
United Kingdom |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Capital expenditures |  |  | $ 100 | $ 600

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