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The Nature of Expenses - Amortization of intangible assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
IFRS Statement [Line Items]      
Amortisation, intangible assets other than goodwill $ 2,213 $ 1,980 $ 1,408
Cost of Revenues [Member]      
IFRS Statement [Line Items]      
Amortisation, intangible assets other than goodwill 58 3 2
Operating Expenses [Member]      
IFRS Statement [Line Items]      
Amortisation, intangible assets other than goodwill $ 2,155 $ 1,977 $ 1,406