Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Net revenues:
Products	$ 30,164	$ 32,314	$ 69,776	$ 121,728
Service	8,880	11,624	28,372	30,883
Total net revenues	39,044	43,938	98,148	152,611
Costs of net revenues:
Cost of products	18,116	15,778	40,908	63,224
Cost of service	4,469	5,379	14,510	15,507
Amortization of intangible assets	658	629	1,963	1,903
Total costs of net revenues	23,243	21,786	57,381	80,634
Gross profit	15,801	22,152	40,767	71,977
Operating expenses:
Research and development	8,926	7,176	24,695	22,296
Selling	6,758	6,308	20,303	20,560
General and administrative	5,424	4,861	16,442	16,525
Amortization of intangible assets	195	193	588	580
Restructuring charge	1,740	0	1,740	0
Total operating expenses	23,043	18,538	63,768	59,961
Income (loss) from operations	(7,242)	3,614	(23,001)	12,016
Other income (expense)
Interest income	7	28	51	113
Interest expense	(118)	(262)	(549)	(795)
Other expense, net	(334)	(121)	(930)	(345)
Total other expense, net	(445)	(355)	(1,428)	(1,027)
Income (loss) before income taxes	(7,687)	3,259	(24,429)	10,989
Provision for (benefit from) income taxes	(3,133)	1,356	(9,727)	2,877
Net income (loss)	$ (4,554)	$ 1,903	$ (14,702)	$ 8,112
Net income (loss) per share:
Basic (dollars per share)	$ (0.20)	$ 0.08	$ (0.63)	$ 0.35
Diluted (dollars per share)	$ (0.20)	$ 0.08	$ (0.63)	$ 0.34
Shares used in per share calculation:
Basic (shares)	23,261	23,310	23,247	23,351
Diluted (shares)	23,261	23,760	23,247	23,874