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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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