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Right-of-use assets and lease liabilities - Undiscounted cash payment (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Undiscounted cash payment    
2021   $ 1,998
2022 $ 19 28
2023 7  
Total undiscounted payments 26 2,026
Less: effect of discounting (1) (38)
Discounted lease liabilities $ 25 $ 1,988