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Accrued liabilities (Tables)
3 Months Ended
Dec. 31, 2021
Payables and Accruals [Abstract]  
Schedule of Accrued Liabilities
          
   December 31,  September 31,
   2021  2021
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