Significant accounting policies - Fair value of financial instruments (Details) $ in Thousands |
12 Months Ended |
|---|---|
|
Dec. 31, 2025
USD ($)
| |
| Significant accounting policies | |
| Fair value, assets, level 1 to level 2 transfers, amount | $ 0 |
| Fair value, assets, level 2 to level 1 transfers, amount | 0 |
| Fair value, assets, into (out of) level 3 transfers, amount | 0 |
| Fair value, liabilities, into (out of) level 3 transfers, amount | 0 |
| Fair value, liabilities, level 1 to level 2 transfers, amount | 0 |
| Fair value, liabilities, level 2 to level 1 transfers, amount | $ 0 |