Balance Sheet Components (Allowance For Credit Losses, Accounts Receivable) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 28, 2020	Jun. 28, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at the beginning of the period	$ 863	$ 609
Provision for expected credit losses	(53)	201
Amounts written off charged against the allowance	0	0
Balance at the end of the period	$ 810	$ 810