Business Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Revenue information shown by geographic region
Total revenues	$ 9,526	$ 7,881	$ 27,675	$ 24,631
United States
Revenue information shown by geographic region
Total revenues	5,572	4,516	14,743	13,180
Europe
Revenue information shown by geographic region
Total revenues	1,942	1,686	5,543	5,463
Rest of Americas
Revenue information shown by geographic region
Total revenues	578	394	2,369	1,722
Asia/Pacific Rim
Revenue information shown by geographic region
Total revenues	$ 1,434	$ 1,285	$ 5,020	$ 4,266