Balance Sheet Components - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Finance lease right-of-use assets	$ 179		$ 179
Property, plant and equipment, and finance lease right-of-use asset gross	132,022		120,905
Less: Accumulated depreciation and amortization	(61,873)		(58,659)
Total	70,149		62,246
Depreciation and amortization expense	3,381	$ 3,759
Computer hardware
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,230		5,195
Computer software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	9,619		9,561
Internally used vehicles and charging systems
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	16,889		16,459
Leased vehicles and batteries
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	6,714		6,863
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	10,607		10,516
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	28,474		28,302
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,889		1,861
Tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	21,939		21,726
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 30,482		$ 20,243