Acquisitions and Dispositions - Napster Disposition Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 30, 2020	Jan. 18, 2019	Dec. 01, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Interest acquired, percent					8400.00%
Portion of Proceeds from Asset Sale Used to Pay Third Parties				$ 5,300
Contingent Consideration Settlement, Cash	$ 2,500	$ (2,500)	$ 0
Contingent Consideration Settlement, Shares	47,800,000
Percentage of shares acquired					42.00%
Loan principal to related party						$ 5,000
Portion of Proceeds from Asset Sale Retained, Net				$ 4,200
Proceeds Retained from Sale of Subsidiary, Shares				173,300,000
Napster Disposal
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Consideration from sale				$ 26,000
Cash consideration				12,000
Indemnity escrow	$ 2,800	$ 2,800		$ 3,000