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Right-of-use assets and lease liabilities - Undiscounted cash payment (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Undiscounted cash payment    
2020   $ 5,034
2021 $ 1,998 3,000
2022 28 1,279
Total undiscounted payments 2,026 9,313
Less: effect of discounting (38) (488)
Discounted lease liabilities $ 1,988 $ 8,825