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FAIR VALUE MEASUREMENT - Key assumptions (Details) - Level 3 - Recurring
Dec. 31, 2025
Y
Dec. 31, 2024
Y
Expected volatility | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Call option asset, Measurement input 0.5387 0.6922
Put option liabilities, measurement input 0.5387 0.6922
Expected volatility | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Call option asset, Measurement input 0.8173 0.9674
Put option liabilities, measurement input 0.8173 0.9674
Risk-free rate | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Call option asset, Measurement input 0.0122 0.011
Put option liabilities, measurement input 0.0122 0.011
Risk-free rate | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Call option asset, Measurement input 0.0137 0.0115
Put option liabilities, measurement input 0.0137 0.0115
Contractual term | Minimum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Call option asset, Measurement input 0.33 1.33
Put option liabilities, measurement input 0.33 1.33
Contractual term | Maximum    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Call option asset, Measurement input 1.5 2.34
Put option liabilities, measurement input 1.5 2.34
Dividend yield    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Call option asset, Measurement input 0 0
Put option liabilities, measurement input 0 0