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Commitments and contingencies - Additional information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Commitments and contingencies:    
Weighted average remaining lease term 1 year 10 months 24 days  
Weighted average discount rate 11.58%  
Rent expense $ 1.0 $ 0.9
Minimum    
Commitments and contingencies:    
Weighted average discount rate 5.25%  
Maximum    
Commitments and contingencies:    
Weighted average discount rate 16.00%