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Accrued expenses (Details) - USD ($)
Jun. 30, 2022
Dec. 31, 2021
Accrued expenses    
Professional fees $ 196,674 $ 247,123
Compensation and benefits 1,679,863 1,418,309
Research and development 1,365,298 3,504,375
Other 263,452 183,189
Total accrued expenses $ 3,505,287 $ 5,352,996