Leases (Lease Cost) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 27, 2021	Jun. 28, 2020	Jun. 27, 2021	Jun. 28, 2020
Leases [Abstract]
Operating lease cost		$ 2,176	$ 2,471	$ 4,570	$ 5,351
Short-term Lease, Cost		83	554	413	668
Total lease cost	[1]	$ 2,259	$ 3,025	$ 4,983	$ 6,019

[1] Included in cost of revenue, sales and marketing, research and development and general and administration in the Company's unaudited condensed statement of operations.