Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) RadioStation Structure	Dec. 31, 2020 USD ($)
Significant Accounting Policies [Line Items]
Number of radio stations | RadioStation	2
Number of advertising structures | Structure	3,500
Percentage of advertising agency fees on gross revenues	15.00%
Depreciation expense	$ 2,700	$ 2,800
Advertising expenses	200	400
Revenues	55,493	39,261
Deferred tax assets valuation allowance	21,000	18,795
COVID-19
Significant Accounting Policies [Line Items]
Deferred tax assets valuation allowance		18,800
Barter
Significant Accounting Policies [Line Items]
Revenues	1,000	900
Expenses	$ 1,000	$ 900
Automobiles, Office Equipment and Computer Equipment
Significant Accounting Policies [Line Items]
Property plant and equipment, estimated useful life	5 years
Advertising Structures
Significant Accounting Policies [Line Items]
Property plant and equipment, estimated useful life	15 years
Minimum | Buildings
Significant Accounting Policies [Line Items]
Property plant and equipment, estimated useful life	30 years
Minimum | Broadcasting Equipment
Significant Accounting Policies [Line Items]
Property plant and equipment, estimated useful life	5 years
Minimum | Software
Significant Accounting Policies [Line Items]
Property plant and equipment, estimated useful life	3 years
Maximum | Buildings
Significant Accounting Policies [Line Items]
Property plant and equipment, estimated useful life	39 years
Maximum | Broadcasting Equipment
Significant Accounting Policies [Line Items]
Property plant and equipment, estimated useful life	7 years
Maximum | Software
Significant Accounting Policies [Line Items]
Property plant and equipment, estimated useful life	5 years