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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jul. 01, 2018 | Jun. 30, 2019 | Jul. 01, 2018
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Total revenue | $ 2,087 | $ 3,122 | $ 5,281 | $ 5,886
Asia Pacific |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Total revenue | 537 | 1,372 | 1,968 | 2,293
North America |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Total revenue | 1,066 | 1,474 | 2,229 | 3,039
Europe |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Total revenue | 484 | 276 | 1,084 | 554
Japan |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Total revenue | $ 330 | $ 632 | $ 764 | $ 1,000
Japan | Total Revenue |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Percentage of total revenue | 16.00% | 20.00% | 14.00% | 17.00%
China |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Total revenue | $ 119 | $ 466 | $ 1,100 | $ 602
China | Total Revenue |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Percentage of total revenue | 6.00% | 15.00% | 20.00% | 10.00%
United States |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Total revenue | $ 1,100 | $ 1,400 | $ 2,200 | $ 3,000
United States | Total Revenue |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |
Percentage of total revenue | 51.00% | 46.00% | 42.00% | 50.00%

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