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Accrued expenses and other liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Accrued expenses and other liabilities    
Research and development $ 3,972 $ 2,840
Compensation and related benefits 842 1,246
Professional fees 357 227
Deferred research obligations 585 2,021
Short-term operating lease liability and other liabilities 61 317
Accrued expenses and other liabilities $ 5,817 $ 6,651