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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Revenue. |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 29,151 | $ 28,845 | $ 28,046 | $ 22,301 | $ 28,753 | $ 24,143 | $ 16,866 | $ 26,051 | $ 108,343 | $ 95,813 | $ 123,072
Revenue, Remaining Performance Obligation, Optional Exemption, Performance Obligation [true false] |  |  |  |  |  |  |  |  | true |  |
Broadcast Advertising Revenue, Net [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue. |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | $ 95,573 | 87,481 | 112,278
Digital Advertising Revenue [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue. |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | 6,337 | 3,416 | 3,783
Other Revenue [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue. |  |  |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax |  |  |  |  |  |  |  |  | $ 6,433 | $ 4,916 | $ 7,011

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