Revenue Recognition (Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 43,400	$ 172,113	$ 69,510
Accounts receivable	$ 300	300	700
Consumer Media
Disaggregation of Revenue [Line Items]
Revenue		13,170	18,168
Consumer Media | Business To Business
Disaggregation of Revenue [Line Items]
Revenue		8,199	12,096
Consumer Media | Sales Channel, Directly to Consumer
Disaggregation of Revenue [Line Items]
Revenue		4,971	6,072
Consumer Media | Software License
Disaggregation of Revenue [Line Items]
Revenue		6,522	9,940
Consumer Media | Advertising And Other
Disaggregation of Revenue [Line Items]
Revenue		1,675	2,156
Consumer Media | Subscription Services
Disaggregation of Revenue [Line Items]
Revenue		4,148	4,895
Consumer Media | Product Sales
Disaggregation of Revenue [Line Items]
Revenue		825	1,177
Mobile Services
Disaggregation of Revenue [Line Items]
Revenue		27,143	29,670
Mobile Services | Business To Business
Disaggregation of Revenue [Line Items]
Revenue		26,691	29,081
Mobile Services | Sales Channel, Directly to Consumer
Disaggregation of Revenue [Line Items]
Revenue		452	589
Mobile Services | Software License
Disaggregation of Revenue [Line Items]
Revenue		3,101	2,838
Mobile Services | Advertising And Other
Disaggregation of Revenue [Line Items]
Revenue		0	0
Mobile Services | Subscription Services
Disaggregation of Revenue [Line Items]
Revenue		24,042	26,832
Mobile Services | Product Sales
Disaggregation of Revenue [Line Items]
Revenue		0	0
Games
Disaggregation of Revenue [Line Items]
Revenue		25,489	21,672
Games | Business To Business
Disaggregation of Revenue [Line Items]
Revenue		4,710	3,225
Games | Sales Channel, Directly to Consumer
Disaggregation of Revenue [Line Items]
Revenue		20,779	18,447
Games | Software License
Disaggregation of Revenue [Line Items]
Revenue		0	0
Games | Advertising And Other
Disaggregation of Revenue [Line Items]
Revenue		3,545	1,884
Games | Subscription Services
Disaggregation of Revenue [Line Items]
Revenue		12,121	11,141
Games | Product Sales
Disaggregation of Revenue [Line Items]
Revenue		9,823	8,647
Napster
Disaggregation of Revenue [Line Items]
Revenue		106,311	0
Napster | Business To Business
Disaggregation of Revenue [Line Items]
Revenue		50,895	0
Napster | Sales Channel, Directly to Consumer
Disaggregation of Revenue [Line Items]
Revenue		55,416	0
Napster | Software License
Disaggregation of Revenue [Line Items]
Revenue		0	0
Napster | Advertising And Other
Disaggregation of Revenue [Line Items]
Revenue		0	0
Napster | Subscription Services
Disaggregation of Revenue [Line Items]
Revenue		106,311	0
Napster | Product Sales
Disaggregation of Revenue [Line Items]
Revenue		$ 0	$ 0