Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2020	Sep. 28, 2019	Oct. 03, 2020	Sep. 28, 2019	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 232,875		$ 232,875		$ 210,449
Less: Accumulated depreciation and amortization	(158,191)		(158,191)		(127,693)
Property and equipment, net	74,684		74,684		82,756
Depreciation and amortization expense	12,300	$ 13,100	33,300	$ 43,200
Tooling and manufacturing equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	120,895		120,895		103,177
Furniture and office equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	20,511		20,511		19,922
Purchased and internally-developed software
Property, Plant and Equipment [Line Items]
Total property and equipment	30,528		30,528		27,424
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 60,941		$ 60,941		$ 59,926