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Trade and other receivables (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of financial assets [line items]    
Trade receivables $ 4,592 $ 6,446
Tax receivables 407 774
Other receivables 35 211
Total trade and other receivables 5,034 7,431
Trade and other receivables 1,412 7,431
Long-term portion 3,622  
Interest expense $ 448  
Discount rate 6.00%  
Past due    
Disclosure of financial assets [line items]    
Trade receivables $ 0 $ 695