Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 210,449	$ 192,879
Less: Accumulated depreciation and amortization	(127,693)	(86,593)
Property and equipment, net	82,756	106,286
Depreciation and amortization expense, net	54,100	48,900	$ 40,000
Tooling and manufacturing equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	103,177	80,685
Property and equipment, net	82,756	106,286
Furniture and office equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	19,922	22,738
Purchased and internally-developed software [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	27,424	21,741
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 59,926	$ 67,715