Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 01, 2017	Mar. 26, 2016
Net revenues:
Products	$ 48,175	$ 39,214
Service	11,139	8,275
Total net revenues	59,314	47,489
Costs of net revenues:
Cost of products	25,478	18,079
Cost of service	5,337	4,484
Amortization of intangible assets	52	435
Total costs of net revenues	30,867	22,998
Gross profit	28,447	24,491
Operating expenses:
Research and development	8,694	8,068
Selling	7,938	7,249
General and administrative	6,307	5,420
Amortization of intangible assets	0	24
Total operating expenses	22,939	20,761
Income from operations	5,508	3,730
Other (income) expense:
Interest income	1	9
Interest expense	(40)	(117)
Other income, net	(3)	225
Total other income (expense), net	(42)	117
Income before income taxes	5,466	3,847
Provision for income taxes	114	380
Net income	$ 5,352	$ 3,467
Net income per share:
Basic (in dollars per share)	$ 0.21	$ 0.14
Diluted (in dollars per share)	$ 0.21	$ 0.14
Weighted average shares used in per share calculation:
Basic (in shares)	25,133	24,308
Diluted (in shares)	25,833	24,597