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STOCK-BASED COMPENSATION, Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Stock-Based Compensation Expense [Abstract] |  |  |  |
Stock-based compensation expense | $ 879 | $ 1,154 | $ 2,062 | $ 1,573
Research and Development [Member] |  |  |  |
Stock-Based Compensation Expense [Abstract] |  |  |  |
Stock-based compensation expense | 470 | 168 | 892 | 570
General and Administrative [Member] |  |  |  |
Stock-Based Compensation Expense [Abstract] |  |  |  |
Stock-based compensation expense | $ 409 | $ 986 | $ 1,170 | $ 1,003

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