Balance Sheet Components (Accounts Receivable) (Details) - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 29, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounts receivable	$ 47,544	$ 61,087
Less: Allowance for doubtful accounts	(111)	(197)
Accounts receivable, net of allowance for doubtful accounts	$ 47,433	$ 60,890

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant