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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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