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Stock-Based Compensation - Allocated Employee Stock-Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 03, 2020
Jun. 28, 2019
Jul. 03, 2020
Jun. 28, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation $ 16,154 $ 15,079 $ 30,136 $ 27,608
Research and development        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation 6,112 5,138 11,198 9,444
Selling, general and administrative        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total stock-based compensation $ 10,042 $ 9,941 $ 18,938 $ 18,164