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Information Concerning Product Lines, Geographic Information and Revenue Concentration - Schedule of Revenue by Product Line (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 28, 2020
Jun. 30, 2019
Jun. 28, 2020
Jun. 30, 2019
Revenue from External Customer [Line Items]        
Total revenue $ 2,196 $ 2,087 $ 4,354 $ 5,281
New products        
Revenue from External Customer [Line Items]        
Total revenue 820 711 1,306 1,398
Mature products        
Revenue from External Customer [Line Items]        
Total revenue $ 1,376 $ 1,376 $ 3,048 $ 3,883