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Related-party Transactions (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
IFRS Statement [Line Items]    
Current receivables due from related parties $ 1,200 $ 2,780
VST [Member]    
IFRS Statement [Line Items]    
Current receivables due from related parties $ 1,200 $ 2,780