Stock-based compensation - Schedule of Other Information about Stock-Based Awards (Details) - $ / shares |
7 Months Ended | 12 Months Ended | |
|---|---|---|---|
Dec. 31, 2025 |
May 25, 2025 |
May 26, 2024 |
|
| RSUs and PSUs | |||
| Weighted-average assumptions used to determine grant-date fair value of PSUs: | |||
| Expected life | 5 years | 5 years | |
| Risk-free interest rate | 3.70% | 4.40% | |
| Volatility | 82.00% | 78.00% | |
| Dividend yield | 0.00% | 0.00% | |
| RSUs | |||
| Weighted-average grant date fair value per share | |||
| Granted (in dollars per share) | $ 7.37 | $ 5.50 | $ 7.48 |
| Weighted-average assumptions used to determine grant-date fair value of PSUs: | |||
| Vested (in dollars per share) | 5.95 | 7.93 | 7.74 |
| PSUs | |||
| Weighted-average grant date fair value per share | |||
| Granted (in dollars per share) | 0 | 3.85 | 4.66 |
| Weighted-average assumptions used to determine grant-date fair value of PSUs: | |||
| Vested (in dollars per share) | $ 5.24 | $ 4.24 | $ 0 |