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Equity - Noncontrolling interest (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Equity |  |  |
Balance at the beginning of year | $ (1,743) | $ (4,261) | $ (1,735)
Equity attributable to non-controlling interests |  |  |
Loss for the year | (1,974) | (2,570) | (2,543)
Transfer of financial liability to noncontrolling interests | 0 | 5,071 | 0
Changes in fair value of financial assets | (2) | (5) | (26)
Remeasurement of defined benefit pension plans | (1) | 17 | 33
Share-based compensation expenses | 8 | 5 | 22
New shares issued by subsidiary | 8,695 | 0 | (10)
Exchange differences arising on translation of foreign operations | 44 | 0 | (2)
Dividends recognised as distributions to owners of parent | (4) | 0 | 0
Balance at the end of year | $ 5,023 | $ (1,743) | $ (4,261)

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