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Warrants (Tables)
 12 Months Ended
Sep. 30, 2020
Text Block [Abstract]  
Summary of Issued Warrants for Its Redeemable Convertible Preferred Stock and Common Stock
In connection with its long-term debt agreements, the Company issued warrants for its redeemable convertible preferred stock and common stock as follows for the year
s
 ended September 30, 2020 and 2019:
 
   
Number of
shares
underlying
warrants
   
Issuance date
   
Expiration date
   
Exercise
price per
share
 
Warrant class/series:
        
Common stock warrants
   18,854    December 22, 2015    December 22, 2025   $14.85 
Common stock warrants
   7,531    March 28, 2016    March 28, 2026   $21.24 
  
 
 
       
Total common stock warrants
   26,385