Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue
Net Revenue	$ 28,046	$ 16,866	$ 50,347	$ 42,917
Remaining performance obligations on leases one year or less exemption			true
Broadcast Advertising Revenue, Net [Member]
Revenue
Net Revenue	24,944	15,241	$ 44,951	38,995
Digital Advertising Revenue [Member]
Revenue
Net Revenue	1,636	709	2,636	1,567
Other Revenue [Member]
Revenue
Net Revenue	$ 1,466	$ 916	$ 2,760	$ 2,355