Financial Statement Components - Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 94,735	$ 40,412
Accumulated depreciation and amortization	(28,435)	(10,152)
Total property and equipment, net	66,300	30,260
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	58,815	14,047
Computer hardware and software
Property, Plant and Equipment [Line Items]
Total property and equipment	7,025	6,797
Land
Property, Plant and Equipment [Line Items]
Total property and equipment	1,001	1,001
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	22,531	885
Vehicles, including demonstration fleet
Property, Plant and Equipment [Line Items]
Total property and equipment	2,207	3,222
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment	900	818
Construction in progress
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 2,256	$ 13,642