CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement [Abstract]
Product	$ 276,876	$ 343,186	$ 376,598
Service	100,151	90,371	85,342
Total net revenue	377,027	433,557	461,940
Product	121,988	172,280	196,766
Service	52,327	48,929	44,729
Total cost of revenue	174,315	221,209	241,495
Total gross profit	202,712	212,348	220,445
Operating expenses:
Research and development	87,545	93,061	99,938
Selling, general and administrative	120,960	131,322	134,014
Amortization of intangibles	5,783	6,775	8,096
Restructuring and asset impairment charges	1,372	2,761	1,421
Total operating expenses	215,660	233,919	243,469
Loss from operations	(12,948)	(21,571)	(23,024)
Interest (expense) income, net	(333)	132	219
Other expense, net	(282)	(356)	(347)
Loss on impairment of long-term investment	(2,505)	0	0
Loss from continuing operations before income taxes	(16,068)	(21,795)	(23,152)
Provision for (benefit from) income taxes	(407)	24,453	(44,741)
Income (loss) from continuing operations	(15,661)	(46,248)	21,589
Income from discontinued operations, net of taxes (including gain on disposal of $14,663, net of taxes, for the year ended December 31, 2013)	0	0	15,438
Net income (loss)	$ (15,661)	$ (46,248)	$ 37,027
Basic net income (loss) per share from:
Continuing operations	$ (0.18)	$ (0.50)	$ 0.20
Discontinued operations	0.00	0.00	0.14
Net income (loss)	(0.18)	(0.50)	0.35
Diluted net income (loss) per share from:
Continuing operations	(0.18)	(0.50)	0.20
Discontinued operations	0.00	0.00	0.14
Net income (loss)	$ (0.18)	$ (0.50)	$ 0.34
Shares used in per share calculations:
Basic	87,514	92,508	106,529
Diluted	87,514	92,508	107,808