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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, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Stock-Based Compensation Expense [Abstract] |  |  |  |
Stock-based compensation expense | $ 214 | $ 879 | $ 903 | $ 2,062
Research and Development [Member] |  |  |  |
Stock-Based Compensation Expense [Abstract] |  |  |  |
Stock-based compensation expense | 56 | 470 | 120 | 892
General and Administrative [Member] |  |  |  |
Stock-Based Compensation Expense [Abstract] |  |  |  |
Stock-based compensation expense | $ 158 | $ 409 | $ 783 | $ 1,170

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