Short Term Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Subclassifications of assets, liabilities and equities [abstract]
Short-term investments (Note 8)	$ 51,590	$ 36,729
Short-term investments, cost	49,985	36,295
Short-term investments, accumulated unrealized holding gains	$ 1,605	$ 434

A component of equity representing accumulated gains and losses on remeasuring available-for-sale financial assets. [Refer: Financial assets available-for-sale]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2018-01-01
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 78
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-02&anchor=para_78_e&doctype=Standard&book=B
-URIDate 2017-03-09

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant