Property and Equipment (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment, Gross		$ 2,716	$ 2,668
Less accumulated depreciation and amortization		1,978	1,585
Total		738	1,083
Research and Development Equipment [Member]
Property, Plant and Equipment, Gross		$ 1,585	1,552
Property, Plant and Equipment, Useful Life		5 years
Office and Computer Equipment [Member]
Property, Plant and Equipment, Gross		$ 753	742
Property, Plant and Equipment, Useful Life		3 years
Autos [Member]
Property, Plant and Equipment, Gross		$ 54	54
Property, Plant and Equipment, Useful Life		5 years
Furniture and Fixtures [Member]
Property, Plant and Equipment, Gross		$ 41	37
Property, Plant and Equipment, Useful Life		7 years
Leasehold Improvements [Member]
Property, Plant and Equipment, Gross	[1]	$ 283	$ 283
Property, Plant and Equipment, Useful Life	[1]	0 years

[1] Shorter of lease term or estimated useful life