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Revenue recognition - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 30, 2024
Apr. 01, 2023
Disaggregation of Revenue [Line Items]    
Total net sales $ 129,457 $ 119,059
U.S.    
Disaggregation of Revenue [Line Items]    
Total net sales 114,281 103,978
U.S. | Pain Treatments    
Disaggregation of Revenue [Line Items]    
Total net sales 50,637 40,995
U.S. | Restorative Therapies    
Disaggregation of Revenue [Line Items]    
Total net sales 25,304 30,776
U.S. | Surgical Solutions    
Disaggregation of Revenue [Line Items]    
Total net sales 38,340 32,207
International    
Disaggregation of Revenue [Line Items]    
Total net sales 15,176 15,081
International | Pain Treatments    
Disaggregation of Revenue [Line Items]    
Total net sales 6,052 5,331
International | Restorative Therapies    
Disaggregation of Revenue [Line Items]    
Total net sales 5,170 5,549
International | Surgical Solutions    
Disaggregation of Revenue [Line Items]    
Total net sales $ 3,954 $ 4,201