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Revenue (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disaggregation of revenue |  |  |
Total revenue | $ 332,741 | $ 243,917 | $ 182,663
Unbilled receivable | 55,700 | 44,900 |
Revenue concession |  | 4,600 |
Advertiser - direct |  |  |
Disaggregation of revenue |  |  |
Total revenue | 135,516 | 106,422 | 84,423
Advertiser - programmatic |  |  |
Disaggregation of revenue |  |  |
Total revenue | 167,798 | 116,115 | 83,475
Supply - side customer |  |  |
Disaggregation of revenue |  |  |
Total revenue | $ 29,427 | $ 21,380 | $ 14,765

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