Information Concerning Product Lines, Geographic Information and Revenue Concentration - Schedule of Revenue by Shipment Destination (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2016	Jun. 28, 2015	Jul. 03, 2016	Jun. 28, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 2,717	$ 4,973	$ 5,667	$ 11,132
Asia Pacific (1)
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	1,779	3,482	3,506	7,290
North America (2)
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	638	1,087	1,457	2,929
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	300	404	704	913
South Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 875	$ 2,100	$ 2,000	$ 4,500
Percentage of total revenue	32.00%	42.00%	35.00%	40.00%
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 604	$ 1,000	$ 1,400	$ 2,800
Percentage of total revenue	22.00%	20.00%	25.00%	25.00%