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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. 29, 2019 | Sep. 30, 2018 | Sep. 29, 2019 | Sep. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Total revenue | $ 2,158 | $ 3,510 | $ 7,439 | $ 9,396
Asia Pacific |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Total revenue | 528 | 1,737 | 2,496 | 4,030
North America |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Total revenue | 1,518 | 1,370 | 3,747 | 4,409
Europe |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Total revenue | 112 | 403 | 1,196 | 957
Japan |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Total revenue | $ 510 | $ 842 | $ 1,300 | $ 1,200
Japan | Total Revenue |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Percentage of total revenue | 24.00% | 24.00% | 17.00% | 13.00%
China |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Total revenue |  |  |  | $ 1,400
China | Total Revenue |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Percentage of total revenue |  |  |  | 15.00%
United States |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Total revenue | $ 1,400 | $ 1,400 | $ 3,600 | $ 4,300
United States | Total Revenue |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Percentage of total revenue | 67.00% | 39.00% | 49.00% | 46.00%

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