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Financial instruments (Details 3) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of financial instruments [Line Items] |  |
Fair Value | $ 0 | $ 0
Unrealized Gross Losses | 486 | 805
Corporate debt [member] |  |
Disclosure of financial instruments [Line Items] |  |
Unrealized Gross Losses |  | 65
Sovereign debts [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Unrealized Gross Losses | 258 | 740
Less than 12 months [member] |  |
Disclosure of financial instruments [Line Items] |  |
Fair Value | 5,147 | 6,975
Unrealized Gross Losses | 35 | 62
Less than 12 months [member] | Corporate debt [member] |  |
Disclosure of financial instruments [Line Items] |  |
Fair Value |  | 1,805
Unrealized Gross Losses |  | 3
Less than 12 months [member] | Sovereign debts [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Fair Value | 5,147 | 5,170
Unrealized Gross Losses | 35 | 59
12 months or longer [member] |  |
Disclosure of financial instruments [Line Items] |  |
Fair Value | 9,616 | 14,610
Unrealized Gross Losses | 223 | 743
12 months or longer [member] | Corporate debt [member] |  |
Disclosure of financial instruments [Line Items] |  |
Fair Value |  | 3,082
Unrealized Gross Losses |  | 62
12 months or longer [member] | Sovereign debts [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Fair Value | 9,616 | 11,528
Unrealized Gross Losses | 223 | 681
Total [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Fair Value | 14,763 | 21,585
Unrealized Gross Losses | 258 | 805
Total [Member] | Corporate debt [member] |  |
Disclosure of financial instruments [Line Items] |  |
Fair Value |  | 4,887
Unrealized Gross Losses |  | 65
Total [Member] | Sovereign debts [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Fair Value | 14,763 | 16,698
Unrealized Gross Losses | $ 258 | $ 740

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- Definition The amount of current financial assets at fair value through other comprehensive income. [Refer: Financial assets at fair value through other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 8 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_8_h&doctype=Standard -URIDate 2017-03-09 + Details
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