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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
	Oct. 01, 2021	Sep. 25, 2020	Oct. 01, 2021	Sep. 25, 2020
Disaggregation Of Revenue [Line Items]
Revenue before reimbursements from continuing operations	$ 71,894	$ 57,917	$ 208,577	$ 180,201
Consulting [Member]
Disaggregation Of Revenue [Line Items]
Revenue before reimbursements from continuing operations	69,650	56,865	198,970	171,140
Software License Sales [Member]
Disaggregation Of Revenue [Line Items]
Revenue before reimbursements from continuing operations	1,750	904	8,837	4,447
Revenue Before Reimbursements [Member]
Disaggregation Of Revenue [Line Items]
Revenue before reimbursements from continuing operations	$ 71,400	$ 57,769	$ 207,807	$ 175,587

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+ References

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