CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Statement of Cash Flows [Abstract]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ (21,258,000)	$ (24,989,000)
Adjustments to reconcile net income (loss) including noncontrolling interests to net cash used in operating activities:
Depreciation and amortization	5,834,000	2,135,000
Stock-based compensation	2,881,000	2,508,000
Equity in net loss of Napster	0	(757,000)
Lease exit and related charges	0	(454,000)
Deferred income taxes, net	(30,000)	1,170,000
(Gain) loss on equity investment, net	(12,338,000)	(12.3)
Foreign currency (gain) loss	310,000	0
Fair value adjustments to contingent consideration liability	1,000,000	0
Mark to market adjustment of warrants	0	124,000
Net change in certain operating assets and liabilities:
Trade accounts receivable	3,089,000	17,971,000
Prepaid expenses, operating lease and other assets	5,083,000	(377,000)
Accounts payable	243,000	(15,125,000)
Accrued, lease and other liabilities	(9,564,000)	(2,941,000)
Net cash provided by (used in) operating activities	(25,370,000)	(19,221,000)
Cash flows from investing activities:
Purchases of equipment, software, and leasehold improvements	(1,192,000)	(765,000)
Proceeds from sales and maturities of short-term investments	24,000	8,755,000
Acquisitions, net of cash acquired	12,249,000	(4,192,000)
Net cash provided by (used in) investing activities	11,081,000	3,798,000
Cash flows from financing activities:
Proceeds from issuance of common stock (stock options and stock purchase plan)	199,000	199,000
Tax payments from shares withheld upon vesting of restricted stock	(309,000)	(261,000)
Proceeds from notes payable and revolving credit facility	41,201,000	0
Repayments of notes payable and revolving credit facility	41,992,000	0
Payment of financing fees	622,000	0
Other financing activities	900,000	0
Net cash provided by (used in) financing activities	(623,000)	(62,000)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(100,000)	(920,000)
Net increase (decrease) in cash, cash equivalents and restricted cash	(15,012,000)	(16,405,000)
Cash, cash equivalents, and restricted cash, beginning of year	37,191,000	53,596,000
Cash, cash equivalents, and restricted cash, end of year	22,179,000	37,191,000
Supplemental disclosure of cash flow information:
Cash received from income tax refunds	2,256,000	308,000
Cash paid for income taxes	1,195,000	1,198,000
Cash paid for interest expense	412,000	0
Non-cash investing activities:
Increase (decrease) in accrued purchases of equipment, software, and leasehold improvements	$ (83,000)	$ 10,000