Acquisitions and Dispositions - Napster Disposal Income Statement Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net loss from discontinued operations, net of tax	$ (1)	$ (997)	$ (2,466)	$ (3,872)
Net income (loss) attributable to noncontrolling interests of discontinued operations	6	(232)	(364)	(752)
Net loss from discontinued operations attributable to RealNetworks	(7)	(765)	(2,102)	(3,120)
Napster Disposal
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	23,563	27,302	73,225	80,222
Cost of revenue	17,438	21,986	56,280	65,408
Gross profit	6,125	5,316	16,945	14,814
Operating expenses	5,828	6,472	19,013	18,642
Operating income (loss)	297	(1,156)	(2,068)	(3,828)
Other income (expenses)	(261)	236	(299)	253
Income (loss) from discontinued operations before income taxes	36	(920)	(2,367)	(3,575)
Income tax expense	37	77	99	297
Net loss from discontinued operations, net of tax	(1)	(997)	(2,466)	(3,872)
Net income (loss) attributable to noncontrolling interests of discontinued operations	6	(232)	(364)	(752)
Net loss from discontinued operations attributable to RealNetworks	$ (7)	$ (765)	$ (2,102)	$ (3,120)