Information Concerning Product Lines, Geographic Information and Revenue Concentration - Schedule of Revenue by Shipment Destination (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Sep. 27, 2015	Oct. 02, 2016	Sep. 27, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 2,809	$ 4,194	$ 8,476	$ 15,326
Asia Pacific (1)
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	1,726	3,044	5,232	10,334
North America (2)
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	682	690	2,139	3,619
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	401	460	1,105	1,373
South Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 1,000	$ 2,400	$ 3,000	$ 6,900
Percentage of total revenue	36.00%	58.00%	35.00%	45.00%
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 675	$ 665	$ 2,100	$ 3,500
Percentage of total revenue	24.00%	16.00%	25.00%	23.00%