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Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 27, 2019
Sep. 28, 2018
Sep. 27, 2019
Sep. 28, 2018
Dec. 28, 2018
Jun. 28, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares available for grant (in shares) 6,024,995   6,024,995      
Compensation expense $ 13,139 $ 9,742 $ 40,747 $ 28,330    
Stock Options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation expense 38,000   $ 38,000      
Weighted-average cost recognition period     2 years 3 months 18 days      
RSUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation expense $ 166,000   $ 166,000      
Weighted-average cost recognition period     2 years 9 months 18 days      
RSUs awarded (in shares)     5,635,362      
Product revenue related performance targets, shares vested and released (in shares) 9,749,823   9,749,823   4,857,334  
PSUs            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
RSUs awarded (in shares)     1,926,605   693,131  
Compensation expense $ 900   $ 3,500      
PSUs | Achieved            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Product revenue related performance targets, shares vested and released (in shares)           114,843
PSUs | Probable            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation expense 1,700   1,700      
Product revenue related performance targets, shares vested and released (in shares)           172,272
PSUs | Not Probable            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized compensation expense $ 82,400   $ 82,400      
PSUs, achieved before December 31, 2020            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum potential to vest, percentage     150.00%      
Maximum potential to vest (in shares)     963,136      
PSUs, second product approval            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Maximum potential to vest, percentage     200.00%      
Maximum potential to vest (in shares)     1,926,605