Segment Information (Segment Results) (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Revenue	[1]	$ 39,472	$ 19,650
Cost of revenue	[2]	24,870	5,136
Gross profit		14,602	14,514
Operating expenses		25,506	19,468
Operating income (loss)		(10,904)	(4,954)
Consumer Media
Segment Reporting Information [Line Items]
Revenue		2,486	5,483
Mobile Services
Segment Reporting Information [Line Items]
Revenue		6,939	8,704
Games
Segment Reporting Information [Line Items]
Revenue		5,710	5,463
Napster [Member]
Segment Reporting Information [Line Items]
Revenue		24,337	0
Operating Segments | Consumer Media
Segment Reporting Information [Line Items]
Revenue		2,486	5,483
Cost of revenue		833	993
Gross profit		1,653	4,490
Operating expenses		3,119	3,918
Operating income (loss)		(1,466)	572
Operating Segments | Mobile Services
Segment Reporting Information [Line Items]
Revenue		6,939	8,704
Cost of revenue		2,048	2,316
Gross profit		4,891	6,388
Operating expenses		7,561	7,366
Operating income (loss)		(2,670)	(978)
Operating Segments | Games
Segment Reporting Information [Line Items]
Revenue		5,710	5,463
Cost of revenue		1,670	1,817
Gross profit		4,040	3,646
Operating expenses		5,037	4,917
Operating income (loss)		(997)	(1,271)
Operating Segments | Napster [Member]
Segment Reporting Information [Line Items]
Revenue		24,337	0
Cost of revenue		20,396	0
Gross profit		3,941	0
Operating expenses		5,532	0
Operating income (loss)		(1,591)	0
Corporate
Segment Reporting Information [Line Items]
Cost of revenue		(77)	10
Operating expenses		4,257	3,267
Operating income (loss)		$ (4,180)	$ (3,277)

[1] Quarters ended March 31, Components of Revenue2019 2018License Fees3,541 7,414Service Revenue35,931 12,236Net Revenue39,472 19,650 Three Months Ended March 31, Components of Revenue2019 2018License Fees$3,541 $7,414Service Revenue35,931 12,236Net Revenue$39,472 $19,650

[2] Quarters ended March 31, Components of Cost of Revenue2019 2018License Fees1,369 1,755Service Revenue23,501 3,381Net Revenue Costs24,870 5,136 Three Months Ended March 31, Components of Cost of Revenue2019 2018License Fees1,369 $1,755Service Revenue23,501 3,381Net Revenue Costs$24,870 $5,136