Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenue
Product	$ 179,246	$ 169,587	$ 174,309
Services	23,805	26,045	29,076
Total revenue	203,051	195,632	203,385
Cost of revenue
Product	113,285	106,678	123,593
Services	19,602	21,019	21,621
Total cost of revenue	132,887	127,697	145,214
Gross profit	70,164	67,935	58,171
Operating expenses
Research and development	33,533	34,756	40,401
Sales and marketing	20,713	21,159	25,889
General and administrative	23,958	25,471	26,554
Gain on sale of dry strip assets and intellectual property		(1,167)	(7,904)
Restructuring charges	2,621	2,334	4,169
Total operating expenses	80,825	82,553	89,109
Loss from operations	(10,661)	(14,618)	(30,938)
Other income (expense)
Interest income	32	44	45
Interest expense	(1,069)	(457)
Other, net	1,531	(1,073)	(1,495)
Total other income (expense)	494	(1,486)	(1,450)
Loss before income taxes	(10,167)	(16,104)	(32,388)
Income tax provision	1,099	1,040	1,646
Net loss	$ (11,266)	$ (17,144)	$ (34,034)
Net loss per share
Basic (in dollars per share)	$ (0.10)	$ (0.16)	$ (0.32)
Diluted (in dollars per share)	$ (0.10)	$ (0.16)	$ (0.32)
Shares used in computing net loss per share
Basic (in shares)	111,450	108,869	107,619
Diluted (in shares)	111,450	108,869	107,619