Balance Sheet Components - Accounts Receivable, Net (Details) - USD ($) $ in Thousands	Sep. 27, 2019	Dec. 31, 2018
Receivables [Abstract]
Accounts receivable	$ 103,460	$ 85,292
Less: allowances for doubtful accounts and sales returns	(2,555)	(3,497)
Accounts Receivable, after Allowance for Credit Loss, Current	$ 100,905	$ 81,795

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.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant