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Income taxes - Summary of Unrecognized Deferred Tax Assets (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Unrecognized deferred tax assets |  |
Tax losses | $ 160,052 | $ 167,030
Other deductible temporary differences | 11,967 | 11,253
Total unrecognized deferred tax assets | $ 172,019 | $ 178,283

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- Definition Unrecognized deferred tax assets. + References No definition available. + Details
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- Definition The amount of deferred tax expense or income relating to the creation or reversal of temporary differences. [Refer: Temporary differences [member]; Deferred tax expense (income)] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 80 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_80_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to tax losses. [Refer: Accounting profit] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_i&doctype=Standard -URIDate 2018-03-16 + Details
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