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Segment Information and Geographical Data (Geographic Revenue before Reimbursements) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 26, 2025	Sep. 27, 2024	Sep. 26, 2025	Sep. 27, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 73,111	$ 79,777	$ 229,875	$ 234,620
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	58,077	66,214	184,785	195,098
Europe (U.K., Germany, France, Switzerland and Spain) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	8,366	8,484	25,579	25,107
Other (Australia, Canada, India and Uruguay) [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 6,668	$ 5,079	$ 19,511	$ 14,415

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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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