Business Segments - Schedule of Revenue Information by Product (Parenthetical) (Details) - USD ($) $ in Thousands	3 Months Ended
Apr. 03, 2021	Mar. 28, 2020
Entity Wide Information Revenue From External Customer [Line Items]
Total revenues	$ 11,959	$ 9,021
Service Contract Revenues
Entity Wide Information Revenue From External Customer [Line Items]
Total revenues	$ 299	$ 315

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details