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v3.19.1

Other assets, net (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Opening balance | $ 22,761 | $ 17,719
Closing balance | 25,261 | 22,761
Gross carrying amount [member] |  |
Opening balance | 30,349 | 23,346
Additions | 8,529 | 7,003
Transfers | (4,695) |
Closing balance | 34,183 | 30,349
Accumulated depreciation and amortisation [member] |  |
Opening balance | 7,588 | 5,627
Additions | 1,334 | 1,961
Transfers | 0 |
Closing balance | 8,922 | 7,588
Patents And Industrial Property [Member] | Gross carrying amount [member] |  |
Opening balance | 13,680 | 9,558
Additions | 2,642 | 4,122
Transfers | (4,599) |
Closing balance | 11,723 | 13,680
Licences [member] | Gross carrying amount [member] |  |
Opening balance | 8,816 | 6,457
Additions | 1,448 | 2,359
Transfers | (96) |
Closing balance | 10,168 | 8,816
Licences [member] | Accumulated depreciation and amortisation [member] |  |
Opening balance | 2,378 | 1,995
Additions | 596 | 383
Transfers | 0 |
Closing balance | 2,974 | 2,378
Mining rights [member] | Gross carrying amount [member] |  |
Opening balance | 7,853 | 7,331
Additions | 4,439 | 522
Transfers | 0 |
Closing balance | 12,292 | 7,853
Mining rights [member] | Accumulated depreciation and amortisation [member] |  |
Opening balance | 5,210 | 3,632
Additions | 738 | 1,578
Transfers | 0 |
Closing balance | $ 5,948 | $ 5,210

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