Balance Sheet Components - Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2020	Jun. 29, 2019	Jul. 04, 2020	Jun. 29, 2019	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Goodwill	$ 64,812		$ 64,812		$ 64,812
Finite-Lived Intangible Assets [Line Items]
Gross	42,881		42,881		42,881
Accumulated Amortization	(33,213)		(33,213)		(26,135)
Total finite-lived intangible assets, net	9,668		9,668		16,746
Amortization of intangible assets	3,000	$ 2,000	7,078	$ 4,121
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross	37,813		37,813		37,813
Accumulated Amortization	(28,145)		(28,145)		(23,910)
Total finite-lived intangible assets, net	9,668		9,668		13,903
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Gross	3,918		3,918		3,790
Accumulated Amortization	(3,918)		(3,918)		(991)
Total finite-lived intangible assets, net	0		0		2,799
Trademarks and other
Finite-Lived Intangible Assets [Line Items]
Gross	1,150		1,150		1,278
Accumulated Amortization	(1,150)		(1,150)		(1,234)
Total finite-lived intangible assets, net	$ 0		$ 0		$ 44