Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 1,419	$ 1,392
Less: accumulated depreciation	(1,340)	(1,316)
Property and equipment, net	79	76
Equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,061	1,061
Equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life (in years)	3 years
Equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life (in years)	15 years
Tooling
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 190	190
Tooling | Minimum
Property, Plant and Equipment [Line Items]
Useful life (in years)	2 years
Tooling | Maximum
Property, Plant and Equipment [Line Items]
Useful life (in years)	5 years
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 141	141
Projects in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 27	$ 0