Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue.
Net revenue	$ 29,145	$ 29,149	$ 29,175	$ 25,304	$ 30,125	$ 29,980	$ 29,821	$ 24,967	$ 112,773	$ 114,893	$ 108,343
Remaining performance obligations on leases one year or less exemption									true
Broadcast Advertising Revenue, Net
Revenue.
Net revenue									$ 94,228	98,709	95,573
Digital Advertising Revenue
Revenue.
Net revenue									9,623	7,912	6,337
Other Revenue
Revenue.
Net revenue									$ 8,922	$ 8,272	$ 6,433