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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
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2019 | Apr. 01, 2018
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total revenue | $ 3,194 | $ 3,194 | $ 2,764
Asia Pacific |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total revenue | 1,431 |  | 921
North America |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total revenue | 1,163 |  | 1,565
Europe |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total revenue | $ 600 |  | 278
China |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total revenue |  | $ 953 | $ 136
China | Total Revenue |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Percentage of total revenue |  | 30.00% | 5.00%
Japan |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total revenue |  | $ 434 | $ 396
Japan | Total Revenue |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Percentage of total revenue |  | 14.00% | 14.00%
United States |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Total revenue |  | $ 1,100 | $ 1,500
United States | Total Revenue |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Percentage of total revenue |  | 36.00% | 56.00%

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