Restructuring Charges (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Costs incurred and charged to expense	$ 2,498,000	$ 1,873,000
Restructuring Reserve [Roll Forward]
Accrued liability beginning balance	755,000	244,000
Costs incurred and charged to expense	1,944,000	1,873,000
Cash payments	(2,203,000)	(1,362,000)
Accrued liability ending balance	496,000	755,000
Napster
Restructuring Reserve [Roll Forward]
Costs incurred and charged to expense	0.5
Employee Separation Costs
Restructuring Cost and Reserve [Line Items]
Costs incurred and charged to expense	1,770,000	1,873,000
Restructuring Reserve [Roll Forward]
Accrued liability beginning balance	755,000	244,000
Costs incurred and charged to expense	1,770,000	1,873,000
Cash payments	(2,203,000)	(1,362,000)
Accrued liability ending balance	322,000	755,000
Contract Termination
Restructuring Cost and Reserve [Line Items]
Costs incurred and charged to expense	728,000	0
Restructuring Reserve [Roll Forward]
Accrued liability beginning balance	0	0
Costs incurred and charged to expense	174,000	0
Cash payments	0	0
Accrued liability ending balance	$ 174,000	$ 0