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Tax - Specification of temporary differences and deferred tax (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Temporary Differences And Deferred Tax [Abstract] |  |  |  |
Property, plant and equipment |  | $ (164) | $ (164) | $ (89)
Pensions |  | (539) | (425) | (225)
Total basis for deferred tax |  | (703) | (590) | (314)
Deferred tax liability | [1],[2] | $ (155) | $ (136) | $ (75)
[1] | Due to materiality, not recognized on a separate line in the statements of financial position.
[2] | The general income tax rate is reduced from 23% to 22%, effective from fiscal year 2019, reduced from 24% to 23%, effective from fiscal year 2018 and reduced from 25% to 24%, effective from fiscal year 2017.

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- Definition Pensions, deferred tax. + References No definition available. + Details
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- Definition Property, plant and equipment, deferred tax. + References No definition available. + Details
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- Definition The disclosure of the specification of temporary differences and deferred tax. + References No definition available. + Details
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- Definition The amount of tax expense (income) relating to changes in deferred tax liabilities and deferred tax assets. [Refer: Deferred tax assets; Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in a deferred tax liability (asset). [Refer: Deferred tax liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81&doctype=Standard -URIDate 2017-03-09 + Details
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