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Segment Information and Geographical Data (Geographic Revenue before Reimbursements) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jul. 01, 2022
Jun. 30, 2023
Jul. 01, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue $ 77,102 $ 75,928 $ 148,331 $ 151,592
United States [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue 65,272 66,717 126,622 131,110
Europe [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue 7,673 5,103 13,734 12,640
Other (Australia, Canada, India and Uruguay) [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue $ 4,157 $ 4,108 $ 7,975 $ 7,842