Prepaid Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Director compensation		$ 215
Director, officer and other insurance	95	70
Legal retainer	25	25
Rent	17	17
Inventory Purchase Deposits	20
Engineering, software licenses and other	15	10
Total prepaid expenses	$ 172	$ 337