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Stock-Based Compensation (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based compensation values accrued compensation expense	$ 200		$ 200	$ 200
Common stock issued as compensation to directors for services, shares	58,309		105,820	105,820
Director [Member]
Share-based compensation shares issued		36,101	2,821
Share-based compensation values accrued compensation expense		$ 200	$ 8,858
Shares issued price per share			$ 3.14
2011 Equity Incentive Plan [Member] | Maximum [Member]
Share-based compensation number of shares authorized	210,000
2018 Equity Incentive Plan [Member]
Share-based compensation shares issued	157,190
Share-based compensation remain available for grant	92,810
2018 Equity Incentive Plan [Member] | Maximum [Member]
Share-based compensation number of shares authorized	250,000
2018 Equity Incentive Plan [Member] | Director [Member]
Sale of common stock		20,814
Conversion of stock issued during period		79,186
Convertible preferred stock, shares issued upon conversion		7

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