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Stock-Based Compensation (Details) - Schedule of stock-based compensation expense - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Stock-Based Compensation (Details) - Schedule of stock-based compensation expense [Line Items] |  |  |  |
Total stock-based compensation | $ 2,425 | $ 209 | $ 9,945 | $ 554
Research and development [Member] |  |  |  |
Stock-Based Compensation (Details) - Schedule of stock-based compensation expense [Line Items] |  |  |  |
Total stock-based compensation | 858 | 134 | 3,861 | 364
General and administrative [Member] |  |  |  |
Stock-Based Compensation (Details) - Schedule of stock-based compensation expense [Line Items] |  |  |  |
Total stock-based compensation | $ 1,567 | $ 75 | $ 6,084 | $ 190

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