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Long-term loan - Disclosure of long-term loan - Vedanta (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about borrowings [line items]      
Long-term loan $ 15,400 $ 15,118 $ 14,818
Vedanta      
Disclosure of detailed information about borrowings [line items]      
Long-term loan 15,400    
Vedanta | Principal      
Disclosure of detailed information about borrowings [line items]      
Long-term loan 15,000    
Vedanta | Balance of accreted premium net of unamortized issuance costs      
Disclosure of detailed information about borrowings [line items]      
Long-term loan 400    
Vedanta | 2023 | Principal      
Disclosure of detailed information about borrowings [line items]      
Long-term loan 5,156    
Vedanta | 2024 | Principal      
Disclosure of detailed information about borrowings [line items]      
Long-term loan 5,625    
Vedanta | 2025 | Principal      
Disclosure of detailed information about borrowings [line items]      
Long-term loan $ 4,219