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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - STOCK BASED COMPENSATION (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 |  |  |  |
Stock-based compensation expense included in operating expenses | $ 3,945 | $ 2,058 | $ 6,906 | $ 3,750
Research and development |  |  |  |
Stock-Based Compensation Expense |  |  |  |
Stock-based compensation expense included in operating expenses | 1,590 | 1,012 | 2,896 | 1,867
General and administrative |  |  |  |
Stock-Based Compensation Expense |  |  |  |
Stock-based compensation expense included in operating expenses | $ 2,355 | $ 1,046 | $ 4,010 | $ 1,883

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