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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%

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