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Equity - Noncontrolling interest (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Equity      
Balance at the beginning of year $ (4,261) $ (1,735) $ 418
Equity attributable to non-controlling interests      
Loss for the year (2,570) (2,543) (2,142)
Transfer of financial liability to noncontrolling interests 5,071 0 0
Changes in fair value of financial assets (5) (26) 9
Remeasurement of defined benefit pension plans 17 33 (14)
Share-based compensation expenses 5 22 52
New shares issued by subsidiary 0 (10) (25)
Exchange differences arising on translation of foreign operations 0 (2) 0
Purchase of subsidiary shares from noncontrolling interests 0 0 (33)
Balance at the end of year $ (1,743) $ (4,261) $ (1,735)