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Segment Information and Geographical Data (Geographic Revenue before Reimbursements) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Oct. 01, 2021
Sep. 30, 2022
Oct. 01, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue $ 72,033 $ 71,894 $ 223,625 $ 208,577
United States [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue 62,505 62,270 193,614 181,488
Europe [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue 5,311 6,072 17,952 17,271
Other (Australia, Canada, India and Uruguay) [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Revenue $ 4,217 $ 3,552 $ 12,059 $ 9,818