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Collaboration Agreements, In-Licensing Arrangements And Business Development Activities - Collaboration Revenues under the Collaboration Agreement with Takeda (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 Takeda        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]        
Total revenues 6,121 25,141 11,557 26,210
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 Takeda        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]        
Total revenues 2,097 22,946 3,398 22,946
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 Takeda        
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]        
Total revenues $ 4,024 $ 2,195 $ 8,159 $ 3,264