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Employee Benefit Plans (Schedule of Total Stock-Based Compensation Expense Resulting from Stock Options, Restricted Stock Awards, and the Employee Stock Purchase Plan) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 29, 2019
Sep. 30, 2018
Sep. 29, 2019
Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation   $ 3,437   $ 9,384
Direct        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation $ 5,219 3,437 $ 15,261 5,336
Indirect        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation   0   4,048
Cost of revenue        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation   236   919
Cost of revenue | Direct        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation 467 236 1,286 336
Cost of revenue | Indirect        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation   0   583
Research and development        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation   872   2,582
Research and development | Direct        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation 1,569 872 4,501 2,186
Research and development | Indirect        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation   0   396
Sales and marketing        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation   754   2,208
Sales and marketing | Direct        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation 791 754 2,722 1,239
Sales and marketing | Indirect        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation   0   969
General and administrative        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation   1,575   3,675
General and administrative | Direct        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation $ 2,392 1,575 $ 6,752 1,575
General and administrative | Indirect        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation   $ 0   $ 2,100