Balance Sheet Components - Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross	$ 41,056		$ 31,866
Accumulated Amortization	(11,259)		(9,510)
Net	29,797		22,356
Intangible assets, net	29,797		22,356
Amortization of intangible assets	1,748	$ 1,377
Developed technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	35,988		30,588
Accumulated Amortization	(10,394)		(8,738)
Net	$ 25,594		21,850
Weighted Average Remaining Useful Life (years)	3 years 9 months 18 days
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	$ 3,918		0
Accumulated Amortization	(164)		0
Net	$ 3,754		0
Weighted Average Remaining Useful Life (years)	6 years 10 months 24 days
Trademarks and other [Member]
Finite-Lived Intangible Assets [Line Items]
Gross	$ 1,150		1,278
Accumulated Amortization	(701)		(772)
Net	$ 449		$ 506
Weighted Average Remaining Useful Life (years)	9 months 18 days