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FAIR VALUE MEASUREMENTS - Significant unobservable inputs (Details) - Monte-Carlo simulation valuation technique - Level 3
Jun. 30, 2025
Y
$ / shares
Dec. 31, 2024
Y
$ / shares
Stock price    
FAIR VALUE MEASUREMENTS    
Warrant liability 0.67 0.79
Exercise price    
FAIR VALUE MEASUREMENTS    
Warrant liability 4 4
Expected term (in years)    
FAIR VALUE MEASUREMENTS    
Warrant liability | Y 3.95 4.44
Volatility    
FAIR VALUE MEASUREMENTS    
Warrant liability 0.864 0.912
Risk-free interest rate    
FAIR VALUE MEASUREMENTS    
Warrant liability 0.0371 0.0453