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Financial risk management objectives and policies - Liquidity risk (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure of financial liabilities [line items]    
Long-term debt $ 35,505 $ 41,416
Lease liabilities 952 638
Accrued liabilities and other payables 3,676 2,159
Trade accounts payables 1,100 4,758
Current portion of fair value of derivative financial instruments 92  
Total 41,325 48,971
Less than 3 months [member]    
Disclosure of financial liabilities [line items]    
Long-term debt 1,566 2,302
Lease liabilities 92 106
Accrued liabilities and other payables 3,676 2,159
Trade accounts payables 1,100 4,758
Current portion of fair value of derivative financial instruments 23  
Total 6,457 9,325
3 to 12 months [member]    
Disclosure of financial liabilities [line items]    
Long-term debt 4,614 6,752
Lease liabilities 275 106
Accrued liabilities and other payables 0 0
Trade accounts payables 0 0
Current portion of fair value of derivative financial instruments 69  
Total 4,958 6,858
1 to 5 years [member]    
Disclosure of financial liabilities [line items]    
Long-term debt 29,325 32,362
Lease liabilities 585 426
Accrued liabilities and other payables 0 0
Trade accounts payables 0 0
Current portion of fair value of derivative financial instruments 0  
Total 29,910 32,788
More than 5 years [member]    
Disclosure of financial liabilities [line items]    
Long-term debt 0 0
Lease liabilities 0 0
Accrued liabilities and other payables 0 0
Trade accounts payables 0 0
Current portion of fair value of derivative financial instruments 0  
Total $ 0 $ 0