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Accrued expenses and other liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Accrued expenses and other liabilities    
Research and development $ 2,205 $ 2,840
Compensation and related benefits 932 1,246
Professional fees 134 227
Short-term operating lease liability and other liabilities 66 317
Deferred research obligations 22 2,021
Accrued expenses and other liabilities $ 3,359 $ 6,651