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Schedule of Segment Reporting Information, by Segment (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
Revenue from External Customer [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
Defense [Member]
Revenue from External Customer [Line Items]
Total Revenues										20,231	8,729	8,724
Industrial [Member]
Revenue from External Customer [Line Items]
Total Revenues										6,882	9,717	6,066
Consumer [Member]
Revenue from External Customer [Line Items]
Total Revenues										852	1,777	4,146
Research and Development [Member]
Revenue from External Customer [Line Items]
Total Revenues										10,123	4,983	5,254
Other [Member]
Revenue from External Customer [Line Items]
Total Revenues										553	61	275
License and Royalties Member
Revenue from External Customer [Line Items]
Total Revenues										$ 1,487	$ 4,252
[1] Includes $3.5 million revenue from licensing functional IP for the three month period ended June 29, 2019.

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