PROPERTY AND EQUIPMENT - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 1,461	$ 1,461
Less: accumulated depreciation	(1,357)	(1,349)
Property and equipment, net	104	112
Equipment
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 1,061	1,061
Equipment | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Equipment | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	15 years
Tooling
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 190	190
Tooling | Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	2 years
Tooling | Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Vehicles
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	5 years
Property and equipment at cost	$ 41	41
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment at cost	141	141
Projects in progress
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 28	$ 28