Derivative contracts (Details) - USD ($) $ in Thousands |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2025 |
Dec. 31, 2024 |
|
| Derivative contracts | ||
| Carrying amount | $ 68,770 | $ 69,934 |
| Digital assets deployed as earn | ||
| Derivative contracts | ||
| Initial net investment | 67,520 | 70,029 |
| Fair value changes on derivative contract | 1,250 | (95) |
| Carrying amount | $ 68,770 | $ 69,934 |