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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
Sep. 30, 2018
Oct. 01, 2017
Sep. 30, 2018
Oct. 01, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue $ 3,510 $ 2,972 $ 9,396 $ 9,168
Asia Pacific (1)        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue 1,737 1,455 4,030 4,865
North America (2)        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue 1,370 1,158 4,409 3,380
Europe        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue 403 359 957 923
China        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue $ 842 $ 429 $ 1,400 $ 1,100
Percentage of total revenue 24.00% 14.00% 15.00% 12.00%
Korea        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue $ 574 $ 636 $ 1,000 $ 1,800
Percentage of total revenue 16.00% 21.00% 11.00% 19.00%
United States        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Percentage of total revenue 39.00% 37.00% 46.00% 36.00%
Total revenue $ 1,400 $ 1,100 $ 4,300 $ 3,300