Segment Information and Geographical Data (Geographic Revenue before Reimbursements) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 27, 2026	Mar. 28, 2025
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 68,797	$ 77,865
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	55,798	64,011
Europe (U.K., Germany, France, Switzerland and Spain) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	7,834	8,355
Other (Australia, Canada, India and Uruguay) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 5,165	$ 5,499

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details