Business Segments and Geographical Information - Revenue Information by Geographic Region (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	$ 42,600	$ 41,593
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	22,097	23,017
Europe
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	9,742	8,097
Americas, excluding the U.S.
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	2,590	2,319
Asia/Pacific Rim
Revenues From External Customers And Long Lived Assets [Line Items]
Total revenues	$ 8,171	$ 8,160