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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 9 Months Ended
Oct. 01, 2017
Oct. 02, 2016
Oct. 01, 2017
Oct. 02, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue $ 2,972 $ 2,809 $ 9,168 $ 8,476
Asia Pacific (1)        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue 1,455 1,726 4,865 5,232
North America (2)        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue 1,158 682 3,380 2,139
Europe        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue 359 401 923 1,105
South Korea        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue $ 636 $ 1,000 $ 1,800 $ 3,000
Percentage of total revenue 21.00% 36.00% 19.00% 35.00%
United States        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue $ 1,100 $ 675 $ 3,300 $ 2,100
Percentage of total revenue 37.00% 24.00% 36.00% 25.00%