Digital assets - Fair values of digital assets (Details) - USD ($) $ in Thousands |
Jun. 30, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Digital assets | ||
| Total | $ 9,428 | $ 4,832 |
| Maximum percentage of other crypto assets | 5.00% | |
| Bitcoin ("BTC") | ||
| Digital assets | ||
| Total | $ 6,315 | 2,064 |
| Ethereum ("ETH") | ||
| Digital assets | ||
| Total | 2,534 | 743 |
| USD Tether ("USDT") | ||
| Digital assets | ||
| Total | 15 | 10 |
| USDC | ||
| Digital assets | ||
| Total | 273 | 1,827 |
| Others (Note) | ||
| Digital assets | ||
| Total | $ 291 | $ 188 |