Acquisitions and Disposals (Details) - USD ($)			3 Months Ended		11 Months Ended	12 Months Ended
	Jan. 18, 2019	Apr. 16, 2018	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017	Nov. 30, 2017
Business Acquisition [Line Items]
Goodwill			$ 62,428,000		$ 62,428,000	$ 62,428,000	$ 16,955,000		$ 13,060,000
Revenue			43,400,000			172,113,000	69,510,000
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain	$ 2.7
Business Combination, Consideration Transferred, Settlement of Debt and Warrants	6,400,000
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value	600,000
Business Combination, Step Acquisition, Remeasurement Gain and Gains (Losses) From Other Preexisting Relationships				$ 12.3		12.3
Guarantor Obligations, Maximum Exposure, Undiscounted, Gain (loss) on Elimination										$ 2.8
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest						(21,258,000)	(24,989,000)
Business Acquisition, Pro Forma Net Income (Loss)						(29,152,000)	(9,422,000)
Business Acquisition, Pro Forma Revenue						178,732,000	214,687,000
Business Acquisition, Pro Forma Transaction Expenses							1.5
Business Acquisition, Transaction Costs			$ 1.5		1.5	1.5
Increases (decreases) due to current year acquisitions (disposals)	$ 45,500,000					$ 45,520,000	4,367,000
Goodwill, Purchase Accounting Adjustments					$ 3.0
Line of Credit
Business Acquisition [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted, Gain (loss) on Elimination										$ 2.8
Netherlands-Based Game Development Studio
Business Acquisition [Line Items]
Percentage of shares acquired		100.00%
Net cash consideration		$ 4,200,000
Intangible assets acquired								$ 100,000
Rhapsody America LLC
Business Acquisition [Line Items]
Percentage of shares acquired	4200.00%
Net cash consideration	$ 21,708,000
Intangible assets acquired	23,700,000
Goodwill	45,520,000
Business Combination, Contingent Consideration, Liability	$ 11,600,000			11.6
Total equity interest in acquiree	8400.00%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain	$ 2,700,000
Initial cash consideration	1,000,000.0
Consideration paid at closing	0.2
Additional amount paid to seller	14.0
Proceeds from sale of interest in acquiree	15.0
Full amount to be paid to seller	40.0
Business Combination, Consideration Transferred, Settlement of Debt and Warrants	6,408,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	10,127,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables	20,915,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	2,421,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Restricted Cash	2,322,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Operating Lease Assets	2,400,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Other	77,000
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets	5,932,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	113,888,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable	786,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accrued Royalties and Fulfillment	59,036,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Accrued and Other Liabilities, Current	7,032,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Contract with Customer, Liability, Current	3,526,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Notes Payable	12,211,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities	6,208,000
Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Lease Obligation	1,190,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other	1,621,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	91,610,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	22,278,000
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value	570,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest	21,708,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	23,700,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	474,000
Rhapsody America LLC | Minimum
Business Acquisition [Line Items]
Additional amount paid to seller	15.0
Proceeds from sale of interest in acquiree	60.0
Rhapsody America LLC | Maximum
Business Acquisition [Line Items]
Additional amount paid to seller	25.0
Rhapsody America LLC | Rhapsody America LLC
Business Acquisition [Line Items]
Noncontrolling interest percentage			1600.00%		1600.00%	1600.00%
Rhapsody America LLC | Other Operating Income (Expense) [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred, Gain (Loss) on Settlement of Debt and Warrants	5.5
Business Acquisition, Release of Preexisting Foreign Currency, Adjustments	1.3
Rhapsody America LLC | Trademarks and Trade Names
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	6,800,000
Rhapsody America LLC | Developed Technology Rights
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	5,900,000
Rhapsody America LLC | Customer relationships
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	5,900,000
Rhapsody America LLC | Partner Relationships
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	$ 5,100,000
Accrued Royalties, Fulfillment and Other Liabilities, Current [Member] | Rhapsody America LLC
Business Acquisition [Line Items]
Business Combination, Contingent Consideration, Liability				2.6
Other Noncurrent Liabilities [Member] | Rhapsody America LLC
Business Acquisition [Line Items]
Business Combination, Contingent Consideration, Liability				$ 9.0
Napster
Business Acquisition [Line Items]
Goodwill			$ 45,520,000		$ 45,520,000	$ 45,520,000	0
Revenue						106,311,000	0
Business Combination, Contingent Consideration, Liability			$ 12,600,000		12,600,000	12,600,000
Napster | Operating Segments
Business Acquisition [Line Items]
Revenue					$ 106,300,000	106,311,000	$ 0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest						$ (6,400,000)