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Shareholders' Equity (Deficit) (Details) - Schedule of equity-based awards recognized - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Shareholders' Equity (Deficit) (Details) - Schedule of equity-based awards recognized [Line Items] |  |  |
Total share-based compensation expense | $ 4,577 | $ 976 | $ 995
Research and development expense [Member] |  |  |
Shareholders' Equity (Deficit) (Details) - Schedule of equity-based awards recognized [Line Items] |  |  |
Total share-based compensation expense | 1,806 | 180 | 239
Marketing and business development [Member] |  |  |
Shareholders' Equity (Deficit) (Details) - Schedule of equity-based awards recognized [Line Items] |  |  |
Total share-based compensation expense | 140 | 90 | 17
General and administrative expense [Member] |  |  |
Shareholders' Equity (Deficit) (Details) - Schedule of equity-based awards recognized [Line Items] |  |  |
Total share-based compensation expense | $ 2,631 | $ 706 | $ 739

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