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SUPPLEMENTAL BALANCE SHEET INFORMATION - Other current liabilities (Details) - USD ($) $ in Thousands	Sep. 26, 2021	Dec. 27, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Deferred revenue	$ 6,483	$ 1,167
Other current liabilities	6,139	6,751
Other current liabilities	$ 12,622	$ 7,918

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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Obligations not otherwise itemized or categorized in the footnotes to the financial statements that are due within one year or operating cycle, if longer, from the balance sheet date.

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