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Commitments and contingencies - Future minimum operating lease payments (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Commitments and contingencies    
2024 $ 856  
2025 675  
2026 73  
Total future minimum lease payments 1,604  
Less - Interest (160)  
Present value of lease liabilities $ 1,444 $ 2,040