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Equity - Noncontrolling interest (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Equity      
Balance at the beginning of year $ 5,023 $ (1,743) $ (4,261)
Equity attributable to non-controlling interests      
Loss for the year (2,961) (1,974) (2,570)
Transfer of financial liability to noncontrolling interests 0 0 5,071
Changes in fair value of financial assets (2) (2) (5)
Remeasurement of defined benefit pension plans 5 (1) 17
Share-based compensation expenses 38 8 5
New shares issued by subsidiary 0 8,695  
Purchase of subsidiary shares from noncontrolling interests 175 0  
Exchange differences arising on translation of foreign operations 0 44  
Declaration of cash dividends (20) (4) 0
Balance at the end of year $ 2,258 $ 5,023 $ (1,743)