Property and Equipment (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment, Gross		$ 1,430	$ 1,216
Less accumulated depreciation and amortization		799	603
Total		631	613
Research and Development Equipment [Member]
Property, Plant and Equipment, Gross		$ 989	834
Property, Plant and Equipment, Useful Life		5 years
Office and Computer Equipment [Member]
Property, Plant and Equipment, Gross		$ 235	181
Property, Plant and Equipment, Useful Life		3 years
Furniture and Fixtures [Member]
Property, Plant and Equipment, Gross		$ 17	12
Property, Plant and Equipment, Useful Life		7 years
Leasehold Improvements [Member]
Property, Plant and Equipment, Gross	[1]	$ 189	$ 189

[1] Shorter of lease term or estimated useful life