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Accrued expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accrued expenses    
Deferred research obligations $ 141  
Compensation and related benefits 1,107 $ 845
Research and development 2,524 9
Professional fees 606 417
Other 94 101
Accrued expenses $ 4,472 $ 1,372