Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Finance lease right-of-use asset	$ 13	$ 13
Property and equipment at cost	3,477	3,084
Less: accumulated depreciation	(2,802)	(2,664)
Property and equipment, net	675	420
Depreciation	$ 188	184
Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	2 years
Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	15 years
Equipment
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 1,308	1,281
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	$ 384	240
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 at cost	$ 83	47
Property and equipment, useful life	5 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 86	137
Property and equipment, useful life	5 years
Computer software
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 1,194	1,057
Property and equipment, useful life	3 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 169	169
UV- Robots
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 105	0
Property and equipment, useful life	5 years
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment at cost	$ 135	$ 140