Financial Statement Components - Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 30,684		$ 30,684		$ 17,787
Accumulated depreciation and amortization	(9,038)		(9,038)		(6,778)
Total property and equipment, net	21,646		21,646		11,009
Depreciation and amortization	1,100	$ 700	2,800	$ 2,100
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	11,315		11,315		7,694
Computer hardware and software
Property, Plant and Equipment [Line Items]
Total property and equipment	5,317		5,317		2,854
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	885		885		869
Vehicles, including demonstration fleet
Property, Plant and Equipment [Line Items]
Total property and equipment	2,618		2,618		2,421
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment	850		850		272
Construction in progress
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 9,699		$ 9,699		$ 3,677