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Shareholders' Equity (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Preferred stock, shares authorized | 5,000,000 |  | 5,000,000
Preferred stock par value |  |  |
Preferred stock, shares issued |  |  |
Preferred stock, shares outstanding |  |  |
Common stock, shares authorized | 150,000,000 |  | 150,000,000
Common stock par value |  |  |
Net proceeds from common stock | $ 65,262 | $ 7,597 |
Common stock, shares issued | 88,914,000 |  | 69,117,000
Common stock, shares outstanding | 88,914,000 |  | 69,117,000
Common stock purchase warrants, shares issued | 3,135,662 |  |
Common stock purchase warrants, shares outstanding | 3,135,662 |  |
Warrant expiry date | Oct. 17, 2029 |  |
Minimum [Member] |  |  |
Common stock purchase warrants, exercise price | $ 1.69 |  |
Maximum [Member] |  |  |
Common stock purchase warrants, exercise price | $ 5.50 |  |

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