Receivables, Net (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019	Dec. 28, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customers, trade	$ 37,696		$ 37,696		$ 34,285
Other receivables	1,221		1,221		3,115
Gross receivables	38,917		38,917		37,400
Less: allowance for doubtful accounts	(199)		(199)		(262)
Receivables, net	38,718		38,718		$ 37,138
Allowance for doubtful accounts [Abstract]
Bad debt expense	$ (1)	$ 51	$ 67	$ 182

Allowance for doubtful accounts [Abstract]

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- Definition

Gross receivables

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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.

+ References

No definition available.

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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- Definition

Amount of allowance for credit loss on accounts receivable, classified as current.

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Amount due from parties in nontrade transactions, classified as other.

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Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

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The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.

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