Leases (Lease Cost) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Oct. 03, 2021	Sep. 27, 2020	Oct. 03, 2021	Sep. 27, 2020
Leases [Abstract]
Operating lease cost		$ 2,312	$ 2,656	$ 6,882	$ 8,007
Short-term Lease, Cost		82	716	495	1,384
Total lease cost	[1]	$ 2,394	$ 3,372	$ 7,377	$ 9,391

[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.