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Segment Information and Geographical Data (Geographic Revenue before Reimbursements) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 28, 2024
Jun. 30, 2023
Jun. 28, 2024
Jun. 30, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue $ 77,656 $ 77,102 $ 154,843 $ 148,331
United States [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue 64,133 65,272 128,884 126,622
Europe [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue 8,630 7,673 16,623 13,734
Other (Australia, Canada, India and Uruguay) [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Total revenue $ 4,893 $ 4,157 $ 9,336 $ 7,975