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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 9 Months Ended
Oct. 01, 2017
Oct. 02, 2016
Oct. 01, 2017
Oct. 02, 2016
Revenue from External Customer [Line Items]        
Total revenue $ 2,972 $ 2,809 $ 9,168 $ 8,476
New products        
Revenue from External Customer [Line Items]        
Total revenue 1,478 1,339 4,881 4,028
Mature products        
Revenue from External Customer [Line Items]        
Total revenue $ 1,494 $ 1,470 $ 4,287 $ 4,448