CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Cash Flows [Abstract]
Net income (loss)	$ (36,550)	$ (81,847)	$ (71,815)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	7,057	10,410	11,959
Stock-based compensation	5,424	4,698	5,204
Equity in net loss of Rhapsody	6,533	14,521	4,452
Lease exit and related charges	2,239	2,501	668
Deferred income taxes, net	130	(1,558)	(237)
Loss (gain) on investments, net	(8,473)	159	(2,371)
Realized translation loss (gain)	272	(264)	(48)
Extinguishment of liability	0	0	(10,580)
Fair value of warrants granted in 2015, net of subsequent mark to market adjustments in 2016 and 2015	280	(1,053)	0
Net change in certain operating assets and liabilities:
Trade accounts receivable	(129)	(8,236)	8,732
Deferred costs, prepaid expenses and other assets	964	2,606	1,982
Accounts payable	1,571	(465)	(769)
Accrued and other liabilities	(3,646)	(10,454)	(7,421)
Net cash provided by (used in) operating activities	(24,328)	(68,982)	(60,244)
Cash flows from investing activities:
Purchases of equipment, software, and leasehold improvements	(2,438)	(1,319)	(2,460)
Proceeds from sale of equity and other investments	4,967	459	2,754
Purchases of short-term investments	(75,766)	(72,136)	(81,216)
Proceeds from sales and maturities of short-term investments	84,249	78,775	97,683
Decrease in restricted cash equivalents and investments	190	110	0
Acquisitions	(150)	(161)	(733)
Advance to Rhapsody	(3,500)	(5,000)	0
Repayment from Rhapsody	0	5,000	0
Proceeds from the sale of Slingo and social casino business	4,000	10,000	0
Other	0	0	(467)
Net cash provided by (used in) investing activities	11,552	15,728	15,561
Cash flows from financing activities:
Proceeds from issuance of common stock (stock options and stock purchase plan)	535	426	812
Tax payments from shares withheld upon vesting of restricted stock	(880)	(85)	(407)
Payment of contingent consideration	0	0	(1,042)
Net cash provided by (used in) financing activities	(345)	341	(637)
Effect of exchange rate changes on cash and cash equivalents	(473)	(3,025)	(2,662)
Net increase (decrease) in cash and cash equivalents	(13,594)	(55,938)	(47,982)
Cash and cash equivalents, beginning of year	47,315	103,253	151,235
Cash and cash equivalents, end of year	33,721	47,315	103,253
Supplemental disclosure of cash flow information:
Cash received from income tax refunds	534	1,102	654
Cash paid for income taxes	2,072	1,491	1,882
Non-cash investing activities:
Increase (decrease) in accrued purchases of equipment, software, and leasehold improvements	26	(150)	(297)
Acquisition of intangible assets	$ 0	$ 102	$ 0