CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2013	Jun. 29, 2012	Jun. 28, 2013	Jun. 29, 2012
Income Statement [Abstract]
Product revenue	$ 96,777	$ 103,352	$ 179,252	$ 202,850
Service revenue	20,351	18,708	39,548	35,649
Net revenue	117,128	122,060	218,800	238,499
Product cost of revenue	48,932	56,494	94,169	113,044
Service cost of revenue	10,304	10,485	20,574	19,912
Total cost of revenue	59,236	66,979	114,743	132,956
Gross profit	57,892	55,081	104,057	105,543
Operating expenses:
Research and development	25,820	24,856	51,071	51,619
Selling, general and administrative	34,424	31,327	67,693	62,730
Amortization of intangibles	2,010	2,190	4,098	4,369
Restructuring and related charges	242		666
Total operating expenses	62,496	58,373	123,528	118,718
Loss from operations	(4,604)	(3,292)	(19,471)	(13,175)
Interest income (expense), net	30	116	94	235
Other income (expense), net	(133)	(120)	(300)	283
Loss from continuing operations before income taxes	(4,707)	(3,296)	(19,677)	(12,657)
(Benefit from) provision for income taxes	(1,303)	579	(6,770)	(47)
Loss from continuing operations	(3,404)	(3,875)	(12,907)	(12,610)
Income (loss) from discontinued operations, net of tax (including gain on disposal of $14,819, net of tax, for the six months ended June 28, 2013)	(396)	3,892	15,528	5,099
Net income (loss)	$ (3,800)	$ 17	$ 2,621	$ (7,511)
Basic and diluted net income (loss) per share from:
Continuing operations	$ (0.03)	$ (0.03)	$ (0.11)	$ (0.11)
Discontinued operations	$ 0.00	$ 0.03	$ 0.14	$ 0.04
Net income (loss)	$ (0.03)	$ 0.00	$ 0.02	$ (0.06)
Shares used in per share calculation:
Basic and diluted	109,938	117,056	112,534	117,162