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Accrued liabilities (Details) - USD ($)
Jun. 30, 2022
Sep. 30, 2021
Payables and Accruals [Abstract]    
Clinical site costs and patient visits $ 2,138,505 $ 2,035,800
Accrued compensation and benefits 889,616 1,201,903
Fixed contract accruals 334,887 649,649
Accrued license fees payables 500,000
All other accrued liabilities 2,050,813 1,727,422
Total accrued liabilities $ 5,913,821 $ 5,614,774