Prepaid Expenses (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Director compensation		$ 9
Director, officer and other insurance	129	115
NASDAQ fees	28
Legal retainer	25	25
Marketing programs and conferences	42	80
Professional services retainer	25	8
Rent	20	11
Equipment service deposits	2	1
Engineering, software licenses and other	13	8
Total prepaid expenses	$ 284	$ 257