Business Segments - Revenue Information by Geographic Region (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]
Total revenues	$ 9,815	$ 10,118	$ 29,644	$ 31,036
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	5,791	5,547	16,763	16,236
Europe
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	2,083	2,011	5,763	6,587
Rest of Americas
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	506	822	2,041	2,431
Asia/Pacific Rim
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	$ 1,435	$ 1,738	$ 5,077	$ 5,782