CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 28, 2014	Mar. 29, 2013
Income Statement [Abstract]
Product revenue	$ 88,260	$ 82,475
Service revenue	19,772	19,197
Net revenue	108,032	101,672
Product cost of revenue	44,606	45,237
Service cost of revenue	11,114	10,270
Total cost of revenue	55,720	55,507
Gross profit	52,312	46,165
Operating expenses:
Research and development	23,888	25,251
Selling, general and administrative	33,547	33,269
Amortization of intangibles	1,950	2,088
Restructuring and related charges	149	424
Total operating expenses	59,534	61,032
Loss from operations	(7,222)	(14,867)
Interest income, net	77	64
Other income (expense), net	12	(167)
Loss from continuing operations before income taxes	(7,133)	(14,970)
(Benefit from) provision for income taxes	(1,723)	(5,467)
Loss from continuing operations	(5,410)	(9,503)
Income from discontinued operations, net of taxes (including gain on disposal of $14,956, net of taxes, for the three months ended March 29, 2013)	0	15,924
Net income (loss)	$ (5,410)	$ 6,421
Basic net income (loss) per share from:
Continuing operations (usd per share)	$ (0.06)	$ (0.08)
Discontinued operations (usd per share)	$ 0.00	$ 0.14
Net income (loss) (usd per share)	$ (0.06)	$ 0.06
Diluted net income (loss) per share from:
Continuing operations (usd per share)	$ (0.06)	$ (0.08)
Discontinued operations (usd per share)	$ 0.00	$ 0.14
Net Income (loss) (usd per share)	$ (0.06)	$ 0.06
Shares used in per share calculation:
Basic (in shares)	97,921	115,219
Diluted (in shares)	97,921	115,219