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Collaboration Agreements And Business Development Activities - Collaboration Revenues under the Collaboration Agreement with Ipsen (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 01, 2022
Jul. 02, 2021
Jul. 01, 2022
Jul. 02, 2021
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]        
Total revenues $ 419,427 $ 385,177 $ 775,407 $ 655,407
Collaborative Arrangement with Ipsen        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]        
Total revenues 62,240 90,921 96,767 124,727
License revenues        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]        
Total revenues 57,526 39,640 89,593 67,168
License revenues | Collaborative Arrangement with Ipsen        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]        
Total revenues 51,168 33,656 75,782 56,107
Collaboration services revenues        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]        
Total revenues 14,857 61,289 28,472 76,779
Collaboration services revenues | Collaborative Arrangement with Ipsen        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]        
Total revenues $ 11,072 $ 57,265 $ 20,985 $ 68,620