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STOCK-BASED COMPENSATION - Stock option activity (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
STOCK-BASED COMPENSATION    
Number of Shares, Exercised (19,497)  
Common stock options    
STOCK-BASED COMPENSATION    
Number of Shares Outstanding, Beginning Balance 737,895  
Number of Shares, Exercised (19,497)  
Number of Shares, Cancelled / Expired (79,196)  
Number of Shares Outstanding, Ending Balance 639,202 737,895
Number of Shares, Options vested and exercisable 329,916  
Weighted Average Exercise Price per Share, Outstanding, Beginning Balance $ 25.42  
Weighted Average Exercise Price per Share, Exercised 2.52  
Weighted Average Exercise Price per Share, Cancelled / Expired 52.95  
Weighted Average Exercise Price per Share, Outstanding, Ending Balance 22.71 $ 25.42
Weighted Average Exercise Price, Options vested and exercisable $ 41.17  
Total Intrinsic Value Outstanding $ 720,000 $ 1,317,000
Total Intrinsic Value, Options vested and exercisable $ 113,000  
Weighted Average Remaining Contractual Life, Outstanding (in years) 7 years 6 months 7 years 7 months 6 days
Weighted Average Remaining Contractual Life, Options vested and exercisable (in years) 6 years 2 months 12 days