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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2021
Revenue |
Schedule of disaggregated revenue | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(in thousands) |  | 2021 |  | 2020 |  | 2019
Advertiser - direct | ​ | $ | 135,516 | ​ | $ | 106,422 | ​ | $ | 84,423
Advertiser - programmatic | ​ |  | 167,798 | ​ |  | 116,115 | ​ |  | 83,475
Supply-side customer | ​ |  | 29,427 | ​ |  | 21,380 | ​ |  | 14,765
Total revenue | ​ | $ | 332,741 | ​ | $ | 243,917 | ​ | $ | 182,663

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