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Information Concerning Product Lines, Geographic Information and Revenue Concentration - Schedule of Revenue by Shipment Destination (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 02, 2017
Apr. 03, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total revenue $ 3,170 $ 2,950
Asia Pacific (1)    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total revenue 1,733 1,727
North America (2)    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total revenue 1,133 819
Europe    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total revenue 304 404
South Korea    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total revenue $ 542 $ 1,100
Percentage of total revenue 17.00% 37.00%
United States    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Total revenue $ 1,100 $ 802
Percentage of total revenue 35.00% 27.00%