Fair value measurement - Warrants (Details) - $ / shares |
Jun. 30, 2025 |
Dec. 31, 2024 |
Jun. 30, 2024 |
|---|---|---|---|
| Fair value measurement | |||
| Exercise price of warrants | $ 0.0001 | ||
| Public Warrants And Private Placement Warrants | |||
| Fair value measurement | |||
| Exercise price of warrants | $ 0.1 | ||
| Public Warrants | |||
| Fair value measurement | |||
| Warrants outstanding | 0 | 0 | |
| Private Placement Warrants | |||
| Fair value measurement | |||
| Warrants outstanding | 0 | 0 | |
| Mezz Warrants | |||
| Fair value measurement | |||
| Warrants outstanding | 3,187,500 | 3,187,500 |