Revenue (Contract Balances) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 24, 2022	Sep. 25, 2021	Sep. 24, 2022	Sep. 25, 2021
Contract With Customer, Change In Liability [Roll Forward]
Beginning contract liability	$ 1,122	$ 1,213	$ 1,285	$ 1,005
Revenue recognized from contract liabilities included in the beginning balance	(797)	(920)	(1,096)	(912)
Increases due to cash received, net of amounts recognized in revenue during the period	760	1,081	896	1,281
Ending contract liability	$ 1,085	$ 1,374	$ 1,085	$ 1,374
Product warranty period			2 years