Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 138,567	$ 115,889
Less: Accumulated depreciation and amortization	(47,744)	(39,336)
Property and equipment, net	90,823	76,553
Tooling and manufacturing equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	55,713	60,944
Furniture and office equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	18,463	14,424
Purchased and internally-developed software [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	18,524	12,032
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 45,867	$ 28,489