Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 40,424	$ 44,248	$ 83,569	$ 83,720
Consumer Media
Disaggregation of Revenue [Line Items]
Revenue	3,159	2,620	6,654	5,106
Consumer Media | Business to Business
Disaggregation of Revenue [Line Items]
Revenue	1,999	1,375	4,343	2,553
Consumer Media | Direct to Consumer
Disaggregation of Revenue [Line Items]
Revenue	1,160	1,245	2,311	2,553
Consumer Media | Software License
Disaggregation of Revenue [Line Items]
Revenue	1,702	944	3,722	1,679
Consumer Media | Subscription Services
Disaggregation of Revenue [Line Items]
Revenue	898	1,040	1,827	2,128
Consumer Media | Product Sales
Disaggregation of Revenue [Line Items]
Revenue	261	206	483	425
Consumer Media | Advertising and Other
Disaggregation of Revenue [Line Items]
Revenue	298	430	622	874
Mobile Services
Disaggregation of Revenue [Line Items]
Revenue	6,461	6,997	13,151	13,936
Mobile Services | Business to Business
Disaggregation of Revenue [Line Items]
Revenue	6,362	6,881	12,946	13,698
Mobile Services | Direct to Consumer
Disaggregation of Revenue [Line Items]
Revenue	99	116	205	238
Mobile Services | Software License
Disaggregation of Revenue [Line Items]
Revenue	972	957	1,803	1,556
Mobile Services | Subscription Services
Disaggregation of Revenue [Line Items]
Revenue	5,489	6,040	11,348	12,380
Mobile Services | Product Sales
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Mobile Services | Advertising and Other
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Games
Disaggregation of Revenue [Line Items]
Revenue	7,465	6,048	14,102	11,758
Games | Business to Business
Disaggregation of Revenue [Line Items]
Revenue	1,197	1,115	2,292	2,151
Games | Direct to Consumer
Disaggregation of Revenue [Line Items]
Revenue	6,268	4,933	11,810	9,607
Games | Software License
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Games | Subscription Services
Disaggregation of Revenue [Line Items]
Revenue	2,730	3,073	5,500	6,058
Games | Product Sales
Disaggregation of Revenue [Line Items]
Revenue	3,712	2,177	6,690	4,165
Games | Advertising and Other
Disaggregation of Revenue [Line Items]
Revenue	1,023	798	1,912	1,535
Napster
Disaggregation of Revenue [Line Items]
Revenue	23,339	28,583	49,662	52,920
Napster | Business to Business
Disaggregation of Revenue [Line Items]
Revenue	10,438	13,804	23,289	25,899
Napster | Direct to Consumer
Disaggregation of Revenue [Line Items]
Revenue	12,901	14,779	26,373	27,021
Napster | Software License
Disaggregation of Revenue [Line Items]
Revenue	0		0
Napster | Subscription Services
Disaggregation of Revenue [Line Items]
Revenue	23,339	28,583	49,662	52,920
Napster | Product Sales
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Napster | Advertising and Other
Disaggregation of Revenue [Line Items]
Revenue	$ 0	$ 0	$ 0	$ 0