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Accrued liabilities (Tables)
6 Months Ended
Mar. 31, 2022
Payables and Accruals [Abstract]  
Schedule of Accrued Liabilities
       
    March 31,   September 31,
    2022   2021
Clinical site costs and patient visits   $ 1,797,377     $ 2,035,800  
Accrued compensation and benefits     511,234       1,201,903  
Fixed contract accruals     391,818       649,649  
Accrued license fees payables     500,000        
All other accrued liabilities     1,794,959       1,727,422  
 Total accrued liabilities   $ 4,995,388     $ 5,614,774