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Accrued expenses and other liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Accrued expenses and other liabilities    
Research and development $ 713 $ 2,261
Compensation and related benefits 1,377 1,874
Professional fees 493 481
Short-term operating lease liability and other liabilities 249 293
Accrued expenses and other liabilities 3,369 4,931
Other $ 537 $ 22