Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue.
Revenue from Contract with Customer, Including Assessed Tax	$ 30,125	$ 29,980	$ 29,821	$ 24,967	$ 29,151	$ 28,845	$ 28,046	$ 22,301	$ 114,893	$ 108,343	$ 95,813
Revenue, Remaining Performance Obligation, Optional Exemption, Performance Obligation [true false]									true
Broadcast Advertising Revenue, Net
Revenue.
Revenue from Contract with Customer, Including Assessed Tax									$ 98,709	95,573	87,481
Digital Advertising Revenue
Revenue.
Revenue from Contract with Customer, Including Assessed Tax									7,912	6,337	3,416
Other Revenue
Revenue.
Revenue from Contract with Customer, Including Assessed Tax									$ 8,272	$ 6,433	$ 4,916