Segment Information (Segment Results) (Detail) - USD ($) $ in Thousands	3 Months Ended								11 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenue	$ 43,400									$ 172,113	$ 69,510
Cost of revenue										103,127	17,727
Gross profit	18,703	$ 18,715	$ 16,966	$ 14,602	$ 12,830	$ 13,340	$ 11,099	$ 14,514		68,986	51,783
Operating expenses										101,429	74,054
Operating Income (Loss), Total	$ (5,883)	$ (6,265)	$ (9,391)	$ (10,904)	$ (5,556)	$ (4,928)	$ (6,833)	$ (4,954)		(32,443)	(22,271)
Consumer Media
Segment Reporting Information [Line Items]
Revenue										13,170	18,168
Mobile Services
Segment Reporting Information [Line Items]
Revenue										27,143	29,670
Games
Segment Reporting Information [Line Items]
Revenue										25,489	21,672
Napster
Segment Reporting Information [Line Items]
Revenue										106,311	0
Operating Segments | Consumer Media
Segment Reporting Information [Line Items]
Revenue										13,170	18,168
Cost of revenue										3,031	3,858
Gross profit										10,139	14,310
Operating expenses										11,186	14,419
Operating Income (Loss), Total										(1,047)	(109)
Operating Segments | Mobile Services
Segment Reporting Information [Line Items]
Revenue										27,143	29,670
Cost of revenue										7,500	8,623
Gross profit										19,643	21,047
Operating expenses										29,340	28,066
Operating Income (Loss), Total										(9,697)	(7,019)
Operating Segments | Games
Segment Reporting Information [Line Items]
Revenue										25,489	21,672
Cost of revenue										6,975	6,123
Gross profit										18,514	15,549
Operating expenses										20,220	20,324
Operating Income (Loss), Total										(1,706)	(4,775)
Operating Segments | Napster
Segment Reporting Information [Line Items]
Revenue									$ 106,300	106,311	0
Cost of revenue										85,901	0
Gross profit										20,410	0
Operating expenses										25,789	0
Operating Income (Loss), Total										(5,379)	0
Corporate
Segment Reporting Information [Line Items]
Cost of revenue										(280)	(877)
Operating expenses										14,894	11,245
Operating Income (Loss), Total										$ (14,614)	$ (10,368)