Principal accounting policies - Statutory reserves and Segment reporting (Details) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2024
USD ($)
segment
|
Dec. 31, 2023
USD ($)
segment
|
Dec. 31, 2022
USD ($)
segment
|
|
| Principal accounting policies | |||
| Minimum percentage appropriation to statutory surplus fund required | 10.00% | ||
| Surplus fund threshold for mandatory appropriation requirement (as a percent) | 50.00% | ||
| Number of reportable segments | segment | 2 | 2 | 2 |
| Statutory reserves | |||
| Principal accounting policies | |||
| Amount appropriated to statutory reserves | $ | $ 2,814 | $ 5,179 | $ 5,732 |
| VIEs registered as PRC domestic companies | |||
| Principal accounting policies | |||
| Minimum percentage appropriation to statutory surplus fund required | 10.00% | ||
| Surplus fund threshold for mandatory appropriation requirement (as a percent) | 50.00% | ||