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Schedule of Quarterly Financial Information (Details) (Parenthetical) - 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		Mar. 30, 2019	Dec. 26, 2020	Dec. 28, 2019	Dec. 29, 2018
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Revenue	$ 13,922	$ 9,513	$ 8,815	$ 7,878	$ 8,727	$ 6,139	$ 9,110	[1]	$ 5,543	$ 40,128	$ 29,519	$ 24,465
Revenue from Licensing Member
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items]
Revenue							$ 3,500
[1] Includes $3.5 million revenue from licensing functional IP for the three month period ended June 29, 2019.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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