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Stock-Based Compensation - Allocated Employee Stock-Based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 02, 2021
Apr. 03, 2020
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total stock-based compensation expense $ 34,653 $ 13,982
Research and development    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total stock-based compensation expense 12,396 5,086
Selling, general and administrative    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total stock-based compensation expense $ 22,257 $ 8,896