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CALL OPTION ASSETS - Key assumptions (Details) - Level 3 | Jun. 30, 2025 Y | Dec. 31, 2024 Y | May 20, 2024 Y | Mar. 26, 2024 Y
--- | --- | --- | --- | ---
Kuaijin | Expected volatility |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Call option asset, Measurement input |  | 0.6922 | 0.6956 |
Kuaijin | Risk-free rate |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Call option asset, Measurement input |  | 0.011 | 0.0183 |
Kuaijin | Contractual term |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Call option asset, Measurement input |  | 1.33 | 2 |
Kuaijin | Dividend yield |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Call option asset, Measurement input |  | 0 | 0 |
Beijing Naonao | Expected volatility |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Call option asset, Measurement input | 0.8173 | 0.9674 |  | 1.1818
Beijing Naonao | Risk-free rate |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Call option asset, Measurement input | 0.0137 | 0.0115 |  | 0.0211
Beijing Naonao | Contractual term |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Call option asset, Measurement input | 1.5 | 2.34 |  | 3.17
Beijing Naonao | Dividend yield |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Call option asset, Measurement input | 0 | 0 |  | 0

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