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Basis of Presentation and General Information (Summary of Disaggregation of Total Revenue Including Reimbursable Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 25, 2020	Sep. 27, 2019	Sep. 25, 2020	Sep. 27, 2019
Disaggregation Of Revenue [Line Items]
Revenue before reimbursements from continuing operations	$ 57,917	$ 72,690	$ 180,201	$ 213,366
Consulting [Member]
Disaggregation Of Revenue [Line Items]
Revenue before reimbursements from continuing operations	56,865	65,971	171,140	194,710
Software License Sales [Member]
Disaggregation Of Revenue [Line Items]
Revenue before reimbursements from continuing operations	904	784	4,447	2,391
Revenue Before Reimbursements [Member]
Disaggregation Of Revenue [Line Items]
Revenue before reimbursements from continuing operations	$ 57,769	$ 66,755	$ 175,587	$ 197,101

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+ References

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