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Accounts Receivable and Contract Assets, Net (Details) - USD ($)
$ in Thousands
Sep. 25, 2020
Dec. 27, 2019
Receivables Net Current [Abstract]    
Accounts receivable $ 26,167 $ 35,884
Contract assets (unbilled revenue) 11,317 14,637
Allowance for doubtful accounts (1,263) (743)
Accounts receivable and contract assets, net $ 36,221 $ 49,778