Condensed Consolidated Statements of Operations - USD ($) shares in Thousands	3 Months Ended
	Mar. 26, 2016	Mar. 28, 2015
Net revenues:
Products	$ 39,214,000	$ 38,339,000
Service	8,275,000	12,037,000
Total net revenues	47,489,000	50,376,000
Costs of net revenues:
Cost of products	18,079,000	19,992,000
Cost of service	4,484,000	6,373,000
Amortization of intangible assets	435,000	632,000
Total costs of net revenues	22,998,000	26,997,000
Gross profit	24,491,000	23,379,000
Operating expenses:
Research and development	8,068,000	8,159,000
Selling	7,249,000	7,116,000
General and administrative	5,420,000	5,767,000
Amortization of intangible assets	24,000	38,000
Restructuring charge	0	58,000
Total operating expenses	20,761,000	21,138,000
Income from operations	3,730,000	2,241,000
Other (income) expense:
Interest income	9,000	10,000
Interest expense	(117,000)	(82,000)
Other income, net	225,000	704,000
Total other income, net	117,000	632,000
Income before income taxes	3,847,000	2,873,000
Provision for income taxes	380,000	317,000
Net income	$ 3,467,000	$ 2,556,000
Net income per share:
Basic (in dollars per share)	$ 0.14	$ 0.11
Diluted (in dollars per share)	$ 0.14	$ 0.11
Weighted average shares used in per share calculation:
Basic (in shares)	24,308	23,866
Diluted (in shares)	24,597	24,257