Employee Benefit Plans (Schedule of Total Stock-Based Compensation Expense Resulting from Stock Options, RSUs, Performance Shares and the ESPP) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2021	Sep. 27, 2020	Oct. 03, 2021	Sep. 27, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 6,210	$ 7,218	$ 20,072	$ 22,726
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	430	923	1,626	3,129
Research and development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	1,414	1,138	3,832	3,879
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	2,008	1,927	5,741	5,596
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation	$ 2,358	$ 3,230	$ 8,873	$ 10,122