Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 02, 2016	Apr. 04, 2015
Net sales:
Products	$ 42,258	$ 38,021
Services	2,752	3,765
Licenses	200	100
Total net sales	45,210	41,886
Cost of sales:
Cost of products sold	24,179	19,605
Cost of services	2,864	3,249
Total cost of sales	27,043	22,854
Gross profit	18,167	19,032
Operating expenses:
Research, development, and engineering	8,235	8,424
Selling, general, and administrative	11,314	12,043
Operating loss	(1,382)	(1,435)
Interest expense	(18)	(31)
Interest and other income, net	173	139
Loss before income tax	(1,227)	(1,327)
(Benefit) provision for income taxes	(73)	360
Net loss	$ (1,154)	$ (1,687)
Net income per share - basic (in dollars per share)	$ (0.04)	$ (0.06)
Number of shares used in per share computations - basic (in shares)	26,798	27,733
Net income per share - diluted (in dollars per share)	$ (0.04)	$ (0.06)
Number of shares used in per share computations - diluted (in shares)	26,798	27,733