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
	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 4,194	$ 4,124	$ 15,326	$ 22,124
Asia Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	3,044	2,341	10,334	16,179
North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	690	1,084	3,619	3,158
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	460	699	1,373	2,787
South Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 2,400	$ 1,100	$ 6,900	$ 11,600
Percentage of total revenue	58.00%	28.00%	45.00%	52.00%
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 665	$ 974	$ 3,500	$ 2,900
Percentage of total revenue	16.00%	24.00%	23.00%	13.00%