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Schedule of Segment Information by Revenue Type (Details) - USD ($) $ in Thousands	3 Months Ended									12 Months Ended
	Dec. 26, 2020	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	[1]	Mar. 30, 2019	Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	$ 13,922	$ 9,513	$ 8,815	$ 7,878	$ 8,727	$ 6,139	$ 9,110		$ 5,543	$ 40,128	$ 29,519	$ 24,465
Percentage of total revenue										100.00%	100.00%	100.00%
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues										$ 33,031	$ 14,946	$ 14,436
Percentage of total revenue										82.00%	51.00%	59.00%
Other Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues										$ 101	$ 134	$ 123
Percentage of total revenue										0.00%	0.00%	1.00%
Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues										$ 33,132	$ 15,080	$ 14,559
Percentage of total revenue										82.00%	51.00%	60.00%
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues										$ 5,798	$ 11,768	$ 6,916
Percentage of total revenue										15.00%	40.00%	28.00%
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues										$ 1,198	$ 2,628	$ 2,948
Percentage of total revenue										3.00%	9.00%	12.00%
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues											$ 42	$ 42
Percentage of total revenue										0.00%	0.00%	0.00%
[1] Includes $3.5 million revenue from licensing functional IP for the three month period ended June 29, 2019.

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