Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 1,392		$ 1,392
Less: accumulated depreciation	(1,324)		(1,316)
Property and equipment, net	68		76
Depreciation	8	$ 44
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
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 141		$ 141