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Property, plant and equipment - Rollforward (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | $ 15,314 |
Impairment loss |  | $ 284
Property, plant and equipment, ending balance | 21,620 | 15,314
Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | 62,834 | 61,875
Additions | 10,025 |
Additions |  | 3,068
Disposals | 2,712 | 1,589
Transfers |  | (600)
Effect of movements in exchange rates | (34) | 80
Property, plant and equipment, ending balance | 70,113 | 62,834
Accumulated amortisation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | (47,520) | (46,174)
Depreciation | 3,078 | 3,171
Impairment loss |  | 284
Disposals | (2,072) | (1,589)
Transfers |  | (600)
Effect of movements in exchange rates | (33) | 80
Property, plant and equipment, ending balance | (48,493) | (47,520)
Building under finance lease |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | 5,819 |
Property, plant and equipment, ending balance | 5,007 | 5,819
Building under finance lease | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | 12,180 | 12,180
Additions | 0 |
Additions |  | 0
Disposals | 0 | 0
Transfers |  | 0
Effect of movements in exchange rates | 0 | 0
Property, plant and equipment, ending balance | 12,180 | 12,180
Building under finance lease | Accumulated amortisation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | (6,361) | (5,549)
Depreciation | 812 | 812
Impairment loss |  | 0
Disposals | 0 | 0
Transfers |  | 0
Effect of movements in exchange rates | 0 | 0
Property, plant and equipment, ending balance | (7,173) | (6,361)
Computer equipment |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | 1,020 |
Property, plant and equipment, ending balance | 1,639 | 1,020
Computer equipment | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | 4,787 | 4,607
Additions | 1,016 |
Additions |  | 390
Disposals | 215 | 169
Transfers |  | (54)
Effect of movements in exchange rates | (4) | 13
Property, plant and equipment, ending balance | 5,584 | 4,787
Computer equipment | Accumulated amortisation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | (3,767) | (3,558)
Depreciation | 383 | 365
Impairment loss |  | 0
Disposals | (200) | (169)
Transfers |  | 0
Effect of movements in exchange rates | (5) | 13
Property, plant and equipment, ending balance | (3,945) | (3,767)
Furniture and fixtures |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | 155 |
Property, plant and equipment, ending balance | 67 | 155
Furniture and fixtures | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | 1,190 | 1,163
Additions | 6 |
Additions |  | 32
Disposals | 87 | 17
Transfers |  | 0
Effect of movements in exchange rates | (6) | 12
Property, plant and equipment, ending balance | 1,103 | 1,190
Furniture and fixtures | Accumulated amortisation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | (1,035) | (978)
Depreciation | 60 | 62
Impairment loss |  | 0
Disposals | (54) | (17)
Transfers |  | 0
Effect of movements in exchange rates | (5) | 12
Property, plant and equipment, ending balance | (1,036) | (1,035)
Leasehold improvements |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | 1,624 |
Property, plant and equipment, ending balance | 1,019 | 1,624
Leasehold improvements | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | 8,246 | 8,794
Additions | 71 |
Additions |  | 7
Disposals | 363 | 594
Transfers |  | 0
Effect of movements in exchange rates | (18) | 39
Property, plant and equipment, ending balance | 7,936 | 8,246
Leasehold improvements | Accumulated amortisation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | (6,622) | (6,606)
Depreciation | 524 | 566
Impairment loss |  | 0
Disposals | (211) | (594)
Transfers |  | 0
Effect of movements in exchange rates | (18) | 44
Property, plant and equipment, ending balance | (6,917) | (6,622)
Production and test equipment |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | 6,696 |
Property, plant and equipment, ending balance | 13,888 | 6,696
Production and test equipment | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | 36,431 | 33,053
Additions | 8,932 |
Additions |  | 2,639
Disposals | 2,047 | 809
Transfers |  | 1,532
Effect of movements in exchange rates | (6) | 16
Property, plant and equipment, ending balance | 43,310 | 36,431
Production and test equipment | Accumulated amortisation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | (29,735) | (28,040)
Depreciation | 1,299 | 1,366
Impairment loss |  | 284
Disposals | (1,607) | (809)
Transfers |  | 843
Effect of movements in exchange rates | (5) | 11
Property, plant and equipment, ending balance | (29,422) | (29,735)
Production and test equipment under finance lease | Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | 0 | 2,078
Additions |  | 0
Disposals |  | 0
Transfers |  | (2,078)
Effect of movements in exchange rates |  | 0
Property, plant and equipment, ending balance |  | 0
Production and test equipment under finance lease | Accumulated amortisation |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Property, plant and equipment, beginning balance | $ 0 | (1,443)
Depreciation |  | 0
Impairment loss |  | 0
Disposals |  | 0
Transfers |  | (1,443)
Effect of movements in exchange rates |  | 0
Property, plant and equipment, ending balance |  | $ 0

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- Definition The increase in property, plant and equipment resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_iii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_vii&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_75_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_v&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_98_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -Clause viii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e_viii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2017-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2017-03-01&anchor=para_73_e&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_a&doctype=Standard -URIDate 2017-03-09 + Details
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