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Commitments and contingencies - Components of leases and lease costs (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Operating leases    
Operating lease right-of-use assets $ 1,458 $ 2,012
Operating lease liabilities, current portion 733 731
Operating lease liabilities, non-current portion 711 1,309
Total operating lease liabilities 1,444 2,040
Operating lease costs    
Operating lease costs $ 1,027 $ 906