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Acquisition and Disposition - Additional information (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Aug. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Feb. 28, 2021 | Feb. 16, 2021
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Revenue |  | $ 90,096 | $ 75,243 | $ 251,848 | $ 198,297 | $ 321,324 | $ 317,923 | $ 307,251 |  |
Goodwill |  | 5,927 |  | $ 5,927 |  |  |  |  |  |
Trade names |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Useful lives of assets acquired |  |  |  | 3 years |  |  |  |  |  |
Trade marks |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Useful lives of assets acquired |  |  |  | 15 years |  |  |  |  |  |
HuffPost Acquisition |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  |  |  |  |  |  |  |  |  | 100.00%
Number of shares issued |  |  |  | 8,625,234 |  |  |  |  |  |
HuffPost Acquisition (in shares) |  |  |  | 8,625,234 |  |  |  |  |  |
Shares Issued in Exchange for Concurrent Cash Investment |  |  |  | 12,544,803 |  |  |  |  |  |
Cash investment |  | $ 35,000 |  | $ 35,000 |  |  |  |  |  |
Business acquisition price |  | $ 2.79 |  | $ 2.79 |  |  |  |  |  |
Revenue |  | $ 9,200 |  | $ 19,100 |  |  |  |  |  |
Ownership interest | 51.00% |  |  |  |  |  |  |  |  |
Loss of disposition | $ 600 |  |  |  |  |  |  |  |  |
Goodwill |  | $ 5,927 |  | $ 5,927 |  | $ 0 |  |  |  |
Verizon |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares issued |  |  |  | 21,170,037 |  |  |  |  |  |
Cash investment |  |  |  |  |  |  |  |  | $ 35,000 |

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