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Income Taxes - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statutory tax rate (as a percent) | 21.00% | 21.00% | 21.00% | 21.00% | 21.00% | 21.00% | 21.00%
Discrete tax benefit | $ (353,000) | $ (12,000) | $ (5,011,000) | $ (797,000) | $ 941,000 | $ (358,000) | $ 902,000
Unrecognized tax position | $ 0 |  | 0 |  | $ 0 | $ 0 |
HuffPost Acquisition |  |  |  |  |  |  |
Discrete tax benefit |  |  | $ 4,300,000 |  |  |  |

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