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STOCK BASED COMPENSATION - Stock based compensation expense (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
STOCK BASED COMPENSATION        
Share-Based Payment Arrangement, Grantee Status [Extensible Enumeration]     us-gaap:ShareBasedPaymentArrangementNonemployeeMember  
Intrinsic value of exercisable options $ 0   $ 0  
Stock-based compensation expense 321,000 $ 313,000 682,000 $ 619,000
Unrecognized stock compensation expense 3,100,000   $ 3,100,000  
Unrecognized stock compensation expense expected to be recognized over the remaining weighted average service period     3 years 4 months 6 days  
ADSs | Amended plan        
STOCK BASED COMPENSATION        
Grants subject to shareholder approval     31,469  
Granted     124,514 0
Research and Development Expense        
STOCK BASED COMPENSATION        
Stock-based compensation expense 86,000 68,000 $ 206,000 $ 118,000
General and Administrative Expense        
STOCK BASED COMPENSATION        
Stock-based compensation expense $ 235,000 $ 245,000 $ 476,000 $ 501,000