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Accounts Receivable and Unbilled Revenue, Net (Details) - USD ($)
$ in Thousands
Sep. 28, 2018
Dec. 29, 2017
Receivables Net Current [Abstract]    
Accounts receivable $ 44,636 $ 44,972
Unbilled revenue 13,859 12,891
Allowance for doubtful accounts (1,620) (2,601)
Accounts receivable and unbilled revenue, net $ 56,875 $ 55,262