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Leases and right-of-use assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2019
Dec. 31, 2020
Dec. 31, 2019
Cost      
Beginning balance $ 11,345 $ 34,507 $ 11,345
Initial adoption of IFRS 16 9,379   9,379
Additions   11,294 14,015
Disposals   (1,405) (232)
Ending balance   44,396 34,507
Accumulated Depreciation      
Beginning balance 0 (5,738) 0
Depreciation for the year   (7,126) (5,889)
Disposals   287 151
Ending balance   (12,577) (5,738)
Right-of-use assets, net carrying amount   31,819 28,769
Right-of-use Land and buildings      
Cost      
Beginning balance 0 8,107 0
Initial adoption of IFRS 16     7,555
Additions   6,922 552
Disposals   (474) 0
Ending balance   14,555 8,107
Accumulated Depreciation      
Beginning balance 0 (1,184) 0
Depreciation for the year   (1,200) (1,184)
Disposals   81 0
Ending balance   (2,303) (1,184)
Right-of-use assets, net carrying amount   12,252 6,923
Right-of-use Plant and equipment      
Cost      
Beginning balance 11,345 26,400 11,345
Initial adoption of IFRS 16     1,824
Additions   4,372 13,463
Disposals   (931) (232)
Ending balance   29,841 26,400
Accumulated Depreciation      
Beginning balance $ 0 (4,554) 0
Depreciation for the year   (5,926) (4,705)
Disposals   206 151
Ending balance   (10,274) (4,554)
Right-of-use assets, net carrying amount   $ 19,567 $ 21,846