Financial Statement Components - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 99,784	$ 98,431
Impairment	(5,976)	0
Accumulated depreciation	(56,010)	(46,150)
Total property and equipment, net	37,798	52,281
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	63,519	62,982
Computer hardware and software
Property, Plant and Equipment [Line Items]
Total property and equipment	8,475	8,404
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	22,620	22,620
Vehicles, including demonstration fleet
Property, Plant and Equipment [Line Items]
Total property and equipment	2,231	2,139
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment	398	398
Construction in progress
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 1,540	$ 887