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v3.23.1

Employee benefits (Tables) | 12 Months Ended
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Dec. 31, 2022
Employee benefits |
Schedule of reconciliations of defined benefit obligation at present value and plan asset at fair value | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | December 31,
​ | ​ | 2021 | ​ | 2022
​ | ​ | ​ | (in thousands)
​ | ​ | ​ | ​ | ​ | ​
Present value of the defined benefit obligations | ​ | $ | 3,489 | ​ | 3,060
Fair value of plan assets | ​ |  | (4,065) |  | (4,307)
Prepaid pension costs | ​ | $ | (576) |  | (1,247)
​
Schedule of movements in present value of the defined benefit obligations | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended December 31,
​ |  | 2021 |  | 2022
​ | ​ | (in thousands)
Balance at beginning of year | ​ | $ | 3,562 |  | 3,489
Service costs | ​ |  | - |  | 4
Interest expense | ​ |  | 15 |  | 27
Remeasurements loss (gain): | ​ |  |  |  |
Actuarial loss (gain) arising from: | ​ |  | ​ |  | ​
-Changes in demographic assumptions | ​ |  | 32 |  | 24
-Experience adjustment | ​ |  | 116 |  | 167
-Change in financial assumptions | ​ |  | (253) |  | (551)
Effect of changes in exchange rates | ​ |  | 17 |  | (100)
Balance at end of year | ​ | $ | 3,489 |  | 3,060
​

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