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Collaboration Agreements, In-Licensing Arrangements And Business Development Activities - Collaboration Revenues under the Collaboration Agreement with Ipsen (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 02, 2021
Jul. 03, 2020
Jul. 02, 2021
Jul. 03, 2020
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]        
Total revenues $ 385,177 $ 259,479 $ 655,407 $ 486,394
Collaborative Arrangement with Ipsen        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]        
Total revenues 90,921 52,917 124,727 81,953
License revenues        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]        
Total revenues 39,640 59,234 67,168 80,113
License revenues | Collaborative Arrangement with Ipsen        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]        
Total revenues 33,656 33,597 56,107 51,546
Collaboration services revenues        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]        
Total revenues 61,289 21,515 76,779 33,671
Collaboration services revenues | Collaborative Arrangement with Ipsen        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]        
Total revenues $ 57,265 $ 19,320 $ 68,620 $ 30,407