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Revenue Recognition (Tables) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2021 | Dec. 31, 2020
Revenue Recognition |  |
Schedule of disaggregation of revenue | The table below presents the Company’s revenue disaggregated based on the nature of its arrangements (in thousands). Management uses these categories of revenue to evaluate the performance of its businesses and to assess its financial results and forecasts. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
Advertising |  | $ | 50,240 |  | $ | 36,051 |  | $ | 136,693 |  | $ | 94,105
Content | ​ | ​ | 26,483 | ​ | ​ | 27,476 | ​ | ​ | 70,261 | ​ | ​ | 74,947
Commerce | ​ | ​ | 13,373 | ​ | ​ | 11,716 | ​ | ​ | 44,894 | ​ | ​ | 29,245
​ |  | $ | 90,096 |  | $ | 75,243 |  | $ | 251,848 |  | $ | 198,297
​ The following table presents the Company’s revenue disaggregated by geography (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30,
​ |  | 2021 |  | 2020 |  | 2021 |  | 2020
Revenue: | ​ |  |  | ​ |  |  | ​ | ​ | ​ | ​ | ​ | ​
United States |  | $ | 79,074 |  | $ | 67,668 |  | $ | 224,854 |  | $ | 179,689
International | ​ | ​ | 11,022 | ​ | ​ | 7,575 | ​ | ​ | 26,994 | ​ | ​ | 18,608
Total |  | $ | 90,096 |  | $ | 75,243 |  | $ | 251,848 |  | $ | 198,297
​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020 |  | 2019 |  | 2018
Advertising | ​ | $ | 149,704 | ​ | $ | 128,438 | ​ | $ | 106,280
Content | ​ |  | 119,846 | ​ |  | 150,876 | ​ |  | 177,055
Commerce and other | ​ |  | 51,774 | ​ |  | 38,609 | ​ |  | 23,916
​ | ​ | $ | 321,324 | ​ | $ | 317,923 | ​ | $ | 307,251

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 + Details
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