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

X

- 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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Balance Type:	na
Period Type:	instant