Loss Per Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net loss	$ (3,666)	$ (2,901)
Less: Dividend paid in-kind to preferred stockholders	(85)	(82)
Less: Deemed dividend on preferred stock	(140)	(121)
Net loss attributable to common stockholders	(3,891)	(3,104)
Loss per share - basic:
Numerator for basic loss per share	$ (3,891)	$ (3,104)
Denominator for basic loss per share (shares)	9,758,332	5,672,976
Basic loss per common share (usd per share)	$ (0.40)	$ (0.55)
Loss per share - diluted:
Numerator for basic loss per share	$ (3,891)	$ (3,104)
Adjust: Warrant revaluation income for dilutive warrants	0	0
Net loss attributable to common stockholders - diluted	$ (3,891)	$ (3,104)
Denominator for basic loss per share (shares)	9,758,332	5,672,976
Incremental shares underlying dilutive in the money warrants outstanding (shares)	0	0
Denominator for diluted loss per share (shares)	9,758,332	5,672,976
Diluted net loss per common share (usd per share)	$ (0.40)	$ (0.55)