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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets |
summary of changes to the goodwill carrying value | ​
​ | ​ | ​ | ​
(in thousands) | ​ | ​ | ​
Goodwill as of December 31, 2020 |  | $ | 227,349
Business combinations (Meetrics and OpenSlate) | ​ | ​ | 124,179
Foreign exchange impact and other |  | ​ | (968)
Goodwill as of December 31, 2021 | ​ | $ | 350,560
Schedule of intangible assets and related accumulated amortization | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2021 | ​ | December 31, 2020
​ | ​ | Gross | ​ | ​ | ​ | ​ | Net | ​ | Gross | ​ | ​ | ​ | ​ | Net
​ | ​ | Carrying | ​ | Accumulated | ​ | Carrying | ​ | Carrying | ​ | Accumulated | ​ | Carrying
(in thousands) |  | Amount |  | Amortization |  | Amount |  | Amount |  | Amortization |  | Amount
Trademarks and brands | ​ | $ | 11,735 | ​ | $ | (3,422) | ​ | $ | 8,313 | ​ | $ | 11,690 | ​ | $ | (2,562) | ​ | $ | 9,128
Customer relationships | ​ | ​ | 143,728 | ​ | ​ | (36,831) | ​ | ​ | 106,897 | ​ | ​ | 102,220 | ​ | ​ | (27,720) | ​ | ​ | 74,500
Developed technology | ​ | ​ | 72,065 | ​ | ​ | (33,937) | ​ | ​ | 38,128 | ​ | ​ | 63,210 | ​ | ​ | (25,128) | ​ | ​ | 38,082
Non-compete agreements | ​ | ​ | 68 | ​ | ​ | (11) | ​ | ​ | 57 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Total intangible assets | ​ | $ | 227,596 | ​ | $ | (74,201) | ​ | $ | 153,395 | ​ | $ | 177,120 | ​ | $ | (55,410) | ​ | $ | 121,710
​
​ | ​ | ​
​ |  | (In years)
Trademarks and brands | ​ | 10
Customer relationships | ​ | 9
Developed technology |  | 4
Non-compete agreements |  | 2
Schedule of Estimated future expected amortization expense of intangible assets | ​
​ | ​ | ​ | ​
(in thousands) |  | ​ | ​
2022 | ​ | $ | 24,091
2023 |  | ​ | 24,014
2024 |  | ​ | 22,371
2025 | ​ | ​ | 20,079
2026 |  | ​ | 13,731
Thereafter |  | ​ | 49,109
Total | ​ | $ | 153,395

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