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Balance sheet information - Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jul. 03, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mar. 30, 2021
Restructuring reserve, current   $ 247      
Payments for restructuring $ 247        
Amortization expense   27,565 $ 26,252 $ 26,622  
Amortization expense included in inventory   7,455 6,416 7,766  
Expected future amortization, year one   28,262     $ 4,475
Expected future amortization, year two   23,910     4,381
Expected future amortization, year three   22,297     4,350
Expected future amortization, year four   22,297     $ 4,350
Expected future amortization, year five   21,259      
Bio Ventus LLC          
Depreciation   2,106 2,579 $ 3,439  
Goodwill, Increase (Decrease)   0 $ 0    
Distribution rights | Accounts Payable          
Finite lived intangible assets acquired   $ 1,000      
Acquired finite lived intangible assets, Weighted average useful life   8 years      
Reclassification Of IPRD | Developed Technology Rights | Bio Ventus LLC          
Finite lived intangible assets acquired   $ 9,650      
Acquired finite lived intangible assets, Weighted average useful life   10 years