Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 31, 2011
Net revenues:
Products	$ 107,402	$ 143,827	$ 194,774
Service	36,905	39,054	35,287
Total net revenues	144,307	182,881	230,061
Costs of net revenues:
Cost of products	59,509	75,878	88,579
Cost of service	19,489	20,526	18,304
Amortization of intangible assets	2,633	2,549	1,077
Total costs of net revenues	81,631	98,953	107,960
Gross profit	62,676	83,928	122,101
Operating expenses:
Research and development	32,714	29,585	23,290
Selling	27,129	26,457	27,019
General and administrative	22,101	21,632	22,901
Amortization of intangible assets	701	776	625
Legal settlement	0	0	2,500
Restructuring charge	1,740	0	0
Total operating expenses	84,385	78,450	76,335
Income (loss) from operations	(21,709)	5,478	45,766
Other (income) expense
Interest income	62	133	220
Interest expense	(651)	(1,040)	(1,336)
Other income (expense), net	(1,267)	48	(66)
Total other expense, net	(1,856)	(859)	(1,182)
Income (loss) before income taxes	(23,565)	4,619	44,584
Provision for (benefit from) income taxes	(9,419)	154	15,899
Net income (loss)	$ (14,146)	$ 4,465	$ 28,685
Net income (loss) per share:
Basic (in dollars per share)	$ (0.61)	$ 0.19	$ 1.26
Diluted (in dollars per share)	$ (0.61)	$ 0.19	$ 1.22
Weighted average shares used in per share calculation:
Basic (in shares)	23,290	23,358	22,743
Diluted (in shares)	23,290	23,845	23,480