Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Net revenues:
Products	$ 19,487	$ 30,164	$ 101,991	$ 69,776
Service	7,646	8,880	24,747	28,372
Total net revenues	27,133	39,044	126,738	98,148
Costs of net revenues:
Cost of products	10,737	18,116	52,165	40,908
Cost of service	4,292	4,469	14,061	14,510
Amortization of intangible assets	688	658	2,039	1,963
Total costs of net revenues	15,717	23,243	68,265	57,381
Gross profit	11,416	15,801	58,473	40,767
Operating expenses:
Research and development	8,037	8,926	25,724	24,695
Selling	6,389	6,758	20,443	20,303
General and administrative	5,781	5,424	18,120	16,442
Amortization of intangible assets	103	195	318	588
Restructuring charge	1,715	1,740	1,715	1,740
Total operating expenses	22,025	23,043	66,320	63,768
Loss from operations	(10,609)	(7,242)	(7,847)	(23,001)
Other income (expense):
Interest income	13	7	37	51
Interest expense	(90)	(118)	(286)	(549)
Other income (expense), net	(57)	(334)	111	(930)
Total other expense, net	(134)	(445)	(138)	(1,428)
Loss before income taxes	(10,743)	(7,687)	(7,985)	(24,429)
Provision for (benefit from) income taxes	17,919	(3,133)	18,494	(9,727)
Net loss	$ (28,662)	$ (4,554)	$ (26,479)	$ (14,702)
Net loss per share:
Basic (dollars per share)	$ (1.19)	$ (0.20)	$ (1.11)	$ (0.63)
Diluted (dollars per share)	$ (1.19)	$ (0.20)	$ (1.11)	$ (0.63)
Weighted shares used in per share calculation:
Basic (shares)	24,132	23,261	23,928	23,247
Diluted (shares)	24,132	23,261	23,928	23,247