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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