Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue:
Product revenue	$ 75,784	$ 60,563	$ 48,715
Service revenue	53,206	52,889	77,254
Total revenue	128,990	113,452	125,969
Operating expenses:
Product costs (exclusive of amortization of intangible assets shown separately below)	56,292	42,081	33,769
Service costs (exclusive of amortization of intangible assets shown separately below)	21,810	25,434	37,481
Sales and marketing	28,297	26,654	21,041
Product development	18,613	19,964	26,315
General and administrative	29,591	30,704	35,428
Amortization of intangible assets	5,728	10,900	18,706
Total operating expenses	160,331	155,737	172,740
Loss from operations	(31,341)	(42,285)	(46,771)
Interest income	195	96	361
Interest expense	(5)	(4)	(143)
Other (expense) income, net	(19)	40,172	3,107
Loss before income taxes	(31,170)	(2,021)	(43,446)
Income tax benefit (expense)	37	10	(55)
Net loss	$ (31,133)	$ (2,011)	$ (43,501)
Net loss per share - basic and diluted (in dollars per share)	$ (1.52)	$ (0.10)	$ (2.18)
Weighted average common shares outstanding - basic and diluted (in shares)	20,501	20,152	19,938