Sales by Geographic Region and Product Category (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2015	Sep. 27, 2014	Oct. 03, 2015	Sep. 27, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues by geography	$ 3,671	$ 3,292	$ 10,438	$ 10,647
Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues by geography	3,357	2,884	9,388	9,413
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues by geography	164	140	510	535
Asia Pacific And Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues by geography	70	127	258	434
Middle East
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues by geography	$ 80	$ 141	$ 282	$ 265