Business Segments and Customers - Revenue Information by Geographic Region (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013	Dec. 29, 2012
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	$ 42,814	$ 38,273	$ 33,859
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	22,590	21,043	18,496
Europe
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	9,096	7,345	7,468
Rest of Americas
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	3,199	3,309	2,335
Asia/Pacific Rim
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	$ 7,929	$ 6,576	$ 5,560