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Accounts Receivable and Unbilled Revenue, Net (Details) - USD ($)
$ in Thousands
Sep. 29, 2017
Dec. 30, 2016
Accounts Receivable And Unbilled Revenue Net [Abstract]    
Accounts receivable $ 39,614 $ 39,335
Unbilled revenue 18,624 10,638
Allowance for doubtful accounts (2,686) (2,574)
Accounts receivable and unbilled revenue, net $ 55,552 $ 47,399