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POST-EMPLOYMENT BENEFITS (Tables) | 12 Months Ended
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Dec. 31, 2022
POST-EMPLOYMENT BENEFITS |
Schedule of Post-employment benefits | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | At December 31 | ​ | At December 31
(in thousands) |  | 2022 |  | 2021
Accrued benefit obligation |  | $ | 1,201 |  | $ | 1,274
​ |  | $ | 1,201 |  | $ | 1,274
​ | ​ | ​ | ​ | ​ | ​ | ​
Post-employment benefits-by balance sheet presentation: | ​ | ​ | ​ | ​ | ​ | ​
Current |  | $ | 120 |  | $ | 120
Non-current | ​ | ​ | 1,081 | ​ | ​ | 1,154
​ |  | $ | 1,201 |  | $ | 1,274
​
Summary of Post-employment benefits continuity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) |  | 2022 |  | 2021
​ | ​ | ​ | ​ | ​ | ​ | ​
Balance-January 1 |  | $ | 1,274 |  | $ | 1,361
Accretion (note 21) | ​ | ​ | 22 | ​ | ​ | 23
Benefits paid | ​ | ​ | (95) | ​ | ​ | (110)
Experience gain adjustment | ​ | ​ | — | ​ | ​ | —
Balance-December 31 | ​ | $ | 1,201 |  | $ | 1,274

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