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Information Concerning Product Lines, Geographic Information and Revenue Concentration - Schedule of Revenue by Shipment Destination (Parenthetical) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 28, 2020
Jun. 30, 2019
Jun. 28, 2020
Jun. 30, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue $ 2,196 $ 2,087 $ 4,354 $ 5,281
Japan        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue 771 330 1,200 764
United States        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue $ 1,300 $ 1,100 $ 2,200 $ 2,200
Total Revenue | Japan        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Percentage of total revenue 35.00% 16.00% 27.00% 14.00%
Total Revenue | United States        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Percentage of total revenue 58.00% 51.00% 51.00% 42.00%