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Operating Expenses - Additional Information (Detail) - Employees | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Disclosure of personnel expense [Abstract] |  |  |
Number of employees | 242 | 164 | 91

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- Definition Disclosure of personnel expense [Abstract] + References No definition available. + Details
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- Definition The number of personnel employed by the entity at a date. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
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