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STOCK-BASED COMPENSATION- Stock-based compensation expenses (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
STOCK-BASED COMPENSATION        
Stock compensation in continuing operations $ 175,000 $ 936,000 $ 715,000 $ 2,922,000
Stock compensation in discontinued operations   560,000 725,000 1,705,000
Total stock compensation expenses 175,000 1,496,000 1,440,000 4,627,000
Research and development        
STOCK-BASED COMPENSATION        
Stock compensation in continuing operations 106,000 201,000 299,000 599,000
General and administrative        
STOCK-BASED COMPENSATION        
Stock compensation in continuing operations $ 69,000 $ 735,000 $ 416,000 $ 2,323,000