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Revenues - Revenues by Disaggregated Category (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 03, 2020
Jun. 28, 2019
Jul. 03, 2020
Jun. 28, 2019
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer $ 259,479 $ 240,275 $ 486,394 $ 455,762
Revenues 259,479 240,275 486,394 455,762
Net product revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 178,730 193,675 372,610 373,256
Gross product revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 229,898 240,418 482,464 464,168
Discounts and allowances        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer (51,168) (46,743) (109,854) (90,912)
Total collaboration revenues        
Disaggregation of Revenue [Line Items]        
Revenues 80,749 46,600 113,784 82,506
License revenues        
Disaggregation of Revenue [Line Items]        
Revenue from contract with customer 59,234 37,742 80,113 63,306
Collaboration services revenues        
Disaggregation of Revenue [Line Items]        
Revenue not from contract with customer $ 21,515 $ 8,858 $ 33,671 $ 19,200