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
Income Statement [Abstract]
Total revenues	$ 10,118	$ 9,526	$ 31,036	$ 27,675
Cost of revenues	4,969	4,802	15,532	14,238
Gross profit	5,149	4,724	15,504	13,437
Operating expenses:
Research and development	1,096	923	3,596	2,803
Sales and marketing	1,980	1,869	5,784	5,340
General and administrative	1,467	1,267	4,521	3,690
Proceeds from demutualization of insurance carrier				(473)
Total operating expenses	4,543	4,059	13,901	11,360
Income from operations	606	665	1,603	2,077
Other expense, net	112	85	300	200
Income from operations before provision for income taxes	494	580	1,303	1,877
Provision for income taxes	4	50	29	58
Net income	$ 490	$ 530	$ 1,274	$ 1,819
Net income per share:
Basic	$ 0.05	$ 0.05	$ 0.13	$ 0.20
Diluted	$ 0.05	$ 0.05	$ 0.12	$ 0.18
Weighted average shares used in computing net income per common share
Basic	9,869	9,796	9,918	9,044
Diluted	10,255	10,177	10,397	9,995