Operating Segments - Summary of Operating Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Net revenue:
Net revenue	$ 34,780	$ 34,181	$ 68,686	$ 65,531
Engineering and programming expenses:
Engineering and programming expenses	6,529	6,818	13,260	15,435
Selling, general and administrative expenses:
Selling, general and administrative expenses	13,249	16,563	28,137	31,050
Corporate expenses	3,440	2,793	6,403	5,237
Depreciation and amortization:
Depreciation and amortization	971	1,111	1,996	2,243
Gain on the disposal of assets, net of disposal costs:
Gain on the disposal of assets, net of disposal costs		(12,826)		(12,827)
Recapitalization costs:
Recapitalization costs	1,045	3,263	1,756	4,089
Impairment charges:
Impairment charges	483		483
Other operating income:
Other operating income	(50)		(51)
Operating income (loss):
Operating income (loss)	9,113	16,459	16,702	20,304
Capital expenditures:
Capital expenditures	733	174	981	450
Assets
Total Assets	437,388		437,388		$ 435,904
Operating Segments | Radio
Net revenue:
Net revenue	31,279	31,279	60,530	59,503
Engineering and programming expenses:
Engineering and programming expenses	5,365	5,672	10,830	11,871
Selling, general and administrative expenses:
Selling, general and administrative expenses	11,997	14,932	24,154	28,068
Depreciation and amortization:
Depreciation and amortization	409	460	836	936
Gain on the disposal of assets, net of disposal costs:
Gain on the disposal of assets, net of disposal costs		(12,826)		(12,826)
Other operating income:
Other operating income	(12)		(12)
Operating income (loss):
Operating income (loss)	13,520	23,041	24,722	31,454
Capital expenditures:
Capital expenditures	648	111	873	313
Assets
Total Assets	380,713		380,713		378,472
Operating Segments | Television
Net revenue:
Net revenue	3,501	2,902	8,156	6,028
Engineering and programming expenses:
Engineering and programming expenses	1,164	1,146	2,430	3,564
Selling, general and administrative expenses:
Selling, general and administrative expenses	1,252	1,631	3,983	2,982
Depreciation and amortization:
Depreciation and amortization	504	559	1,041	1,118
Gain on the disposal of assets, net of disposal costs:
Gain on the disposal of assets, net of disposal costs				(1)
Impairment charges:
Impairment charges	483		483
Other operating income:
Other operating income	(38)		(38)
Operating income (loss):
Operating income (loss)	136	(434)	257	(1,635)
Capital expenditures:
Capital expenditures	57	44	74	67
Assets
Total Assets	53,915		53,915		54,836
Corporate, Non-Segment
Selling, general and administrative expenses:
Corporate expenses	3,440	2,793	6,403	5,237
Depreciation and amortization:
Depreciation and amortization	58	92	119	189
Recapitalization costs:
Recapitalization costs	1,045	3,263	1,756	4,089
Other operating income:
Other operating income			(1)
Operating income (loss):
Operating income (loss)	(4,543)	(6,148)	(8,277)	(9,515)
Capital expenditures:
Capital expenditures	28	$ 19	34	$ 70
Assets
Total Assets	$ 2,760		$ 2,760		$ 2,596