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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

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