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Commitments and contingencies - Components of leases and lease costs (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Operating leases      
Operating lease right-of-use assets $ 1,273   $ 1,458 [1]
Operating lease liabilities, current portion 755   733 [1]
Operating lease liabilities, non-current portion 512   711 [1]
Total operating lease liabilities 1,267   $ 1,444
Operating lease costs      
Operating lease costs $ 300 $ 200  
[1] The condensed balance sheet as of December 31, 2023 was derived from the audited balance sheet as of that date.