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SUPPLEMENTAL BALANCE SHEET INFORMATION - Other current liabilities (Details) - USD ($) $ in Thousands | Sep. 26, 2021 | Dec. 27, 2020
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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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