Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities
Net loss	$ (31,133)	$ (2,011)	$ (43,501)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	11,803	18,090	29,884
Deferred income taxes	(68)	(45)
Stock-based compensation	8,565	7,779	7,562
Goodwill impairment charge	0	0
Gain on disposal of business and online properties		(40,230)	(3,156)
Other	(191)	111	(105)
Change in operating assets and liabilities, net of effect of acquisitions and disposals:
Accounts receivable, net	(1,108)	3,502	3,840
Prepaid expenses and other current assets	705	238	917
Other long-term assets	81	(371)	(131)
Accounts payable	(1,140)	529	(2,794)
Accrued expenses and other liabilities	972	(166)	(1,177)
Deferred revenue	(142)	(519)	223
Net cash used in operating activities	(11,656)	(13,093)	(8,438)
Cash flows from investing activities
Purchases of property and equipment	(5,337)	(4,582)	(4,732)
Purchases of intangible assets	(286)	(147)	(87)
Cash received from disposal of businesses and online properties, net of cash disposed	4,285	36,815	5,071
Cash received from early repayment of promissory note			5,100
Cash received from disposition holdback			998
Cash paid for acquisitions, net of cash acquired	(6,304)	(1,413)	(58)
Restricted deposits	742	136	671
Other	7	98	126
Net cash (used in) provided by investing activities	(6,893)	30,907	7,089
Cash flows from financing activities
Proceeds from exercises of stock options and purchases under ESPP	2,598	579	464
Repurchases of common stock	(65)	(4,874)
Taxes paid on net share settlements of restricted stock units	(3,284)	(1,246)	(668)
Cash paid for acquisition holdback	(119)		(7,561)
Other	(65)	(32)	(121)
Net cash used in financing activities	(935)	(5,573)	(7,886)
Effect of foreign currency on cash and cash equivalents	(36)	53	(15)
Change in cash and cash equivalents	(19,520)	12,294	(9,250)
Cash and cash equivalents, beginning of period	50,864	38,570	47,820
Cash and cash equivalents, end of period	31,344	50,864	38,570
Supplemental disclosure of cash flows
Cash paid for interest	6	4	143
Cash paid for taxes	112	$ 99	116
Stock issued for acquisitions	$ 1,603		$ 731