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STOCKHOLDERS' EQUITY - STOCK-BASED COMPENSATION EXPENSE FOR EMPLOYEES AND DIRECTORS (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Stock-Based Compensation Expense      
Stock-based compensation expense included in operating expenses $ 18,525 $ 8,001 $ 8,080
Research and development      
Stock-Based Compensation Expense      
Stock-based compensation expense included in operating expenses 7,426 3,720 3,597
General and administrative      
Stock-Based Compensation Expense      
Stock-based compensation expense included in operating expenses $ 11,099 $ 4,281 $ 4,483