Balance Sheet Components - Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Apr. 04, 2021	Jan. 03, 2021
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 141,798	$ 137,543
Less: accumulated depreciation	(95,008)	(90,777)
Property, plant and equipment, net	46,790	46,766
Manufacturing equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	17,972	17,134
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	29,257	29,385
Solar power systems
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	30,844	30,110
Computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	49,738	49,935
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,855	7,899
Construction-in-process
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 6,132	$ 3,080