Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 04, 2020	Mar. 30, 2019	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 214,490		$ 210,449
Less: Accumulated depreciation and amortization	(138,272)		(127,693)
Property and equipment, net	76,218		82,756
Depreciation and amortization expense	10,600	$ 13,400
Tooling and manufacturing equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	105,753		103,177
Property and equipment, net	76,218		82,756
Furniture and office equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	20,249		19,922
Purchased and internally-developed software
Property, Plant and Equipment [Line Items]
Total property and equipment	28,401		27,424
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 60,087		$ 59,926