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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