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Subsequent Event (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 04, 2021 | May 15, 2020 | Feb. 28, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Gross proceeds of common shares issued |  | $ 4,680 | $ 15,200 |  |  |
Exercise price |  |  |  | $ 0.63 | $ 0.63 | $ 0.58
Subsequent Event [Member] |  |  |  |  |  |
Warrants to purchase common shares | 7,361,100 |  |  |  |  |
Underwriting public offering shares | 14,722,200 |  |  |  |  |
Gross proceeds of common shares issued | $ 15,200,000 |  |  |  |  |
Exercise price | $ 1.35 |  |  |  |  |
Warrants offering price | $ 0.90 |  |  |  |  |
Purchase additional common shares | 2,208,330 |  |  |  |  |
Warrants issued during the period | 16,930,530 |  |  |  |  |
Common stock shares issued | 16,930,530 |  |  |  |  |
Shares to be issued on exercise of warrant | 8,465,265 |  |  |  |  |
Additional warrants purchase | 1,104,165 |  |  |  |  |

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