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Accrued liabilities (Details) - USD ($)
Dec. 31, 2021
Sep. 30, 2021
Payables and Accruals [Abstract]    
Clinical site costs and patient visits $ 1,689,740 $ 2,035,800
Accrued compensation and benefits 1,205,186 1,201,903
Fixed contract accruals 359,424 649,649
All other accrued liabilities 2,195,690 1,727,422
 Total accrued liabilities $ 5,450,040 $ 5,614,774