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Employee benefits - Sensitivity analysis (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 01, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Statement [line items]        
Contribution expense to the plan $ 8 $ 47 $ 0 $ 0
Defined benefit Plan +0.5%        
Statement [line items]        
Discount rate   (238) (290)  
Rate of increase in compensation levels   255 310  
Defined benefit Plan -0.5%        
Statement [line items]        
Discount rate   261 319  
Rate of increase in compensation levels   $ (235) $ (285)