FAIR VALUE MEASUREMENTS - Fair value of private placement warrants (Details) - Level 3 - Private Placement Warrants |
Sep. 30, 2025
$ / shares
Y
|
Dec. 31, 2024
$ / shares
|
Dec. 31, 2024
Y
|
Dec. 31, 2024 |
Dec. 31, 2023
Y
$ / shares
|
|---|---|---|---|---|---|
| Stock price | |||||
| FAIR VALUE MEASUREMENTS | |||||
| Derivative liability measurement input | 12.2 | 11.55 | 11.05 | ||
| Exercise price | |||||
| FAIR VALUE MEASUREMENTS | |||||
| Derivative liability measurement input | 11.5 | 11.5 | 11.5 | ||
| Expected term (in years) | |||||
| FAIR VALUE MEASUREMENTS | |||||
| Derivative liability measurement input | Y | 6.03 | 5.78 | 5.28 | ||
| Volatility | |||||
| FAIR VALUE MEASUREMENTS | |||||
| Derivative liability measurement input | 0.022 | 0.03 | 2.8 | ||
| Risk-free rate | |||||
| FAIR VALUE MEASUREMENTS | |||||
| Derivative liability measurement input | 0.0377 | 0.0432 | 0.0377 | ||
| Fair value | |||||
| FAIR VALUE MEASUREMENTS | |||||
| Derivative liability measurement input | 0.15 | 0.06 | 0.0006 | 0.0002 | |
| Probability of Business Combination | |||||
| FAIR VALUE MEASUREMENTS | |||||
| Derivative liability measurement input | 0.049 | 0.023 | 0.012 |