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The Nature of Expenses - Amortization of intangible assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
IFRS Statement [Line Items]      
Amortisation, intangible assets other than goodwill $ 1,723 $ 2,213 $ 1,980
Cost of Revenues [Member]      
IFRS Statement [Line Items]      
Amortisation, intangible assets other than goodwill 57 58 3
Operating Expenses [Member]      
IFRS Statement [Line Items]      
Amortisation, intangible assets other than goodwill $ 1,666 $ 2,155 $ 1,977