Condensed Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Net sales:
Products	$ 27,566	$ 56,565
Services	3,943	4,081
Licenses	100	0
Total net sales	31,609	60,646
Cost of sales:
Cost of products sold	15,448	24,540
Cost of services	3,169	2,813
Total cost of sales	18,617	27,353
Gross profit	12,992	33,293
Operating expenses:
Research, development, and engineering	8,214	8,396
Selling, general, and administrative	11,966	11,821
Operating income (loss)	(7,188)	13,076
Interest expense	(2)	(24)
Interest and other income (expense), net	317	120
Income (loss) before income tax	(6,873)	13,172
Provision for (benefit from) income taxes	98	(520)
Net income (loss)	$ (6,971)	$ 13,692
Net income per share - basic (in dollars per share)	$ (0.25)	$ 0.50
Number of shares used in per share computations - basic (in shares)	28,144	27,571
Net income per share - diluted (in dollars per share)	$ (0.25)	$ 0.48
Number of shares used in per share computations - diluted (in shares)	28,144	28,563