Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Fair Value of Stock Options Granted (Details)

v3.21.4
Stock-Based Compensation - Fair Value of Stock Options Granted (Details) - $ / shares
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock price (in dollars per share) $ 10.00    
Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock price (in dollars per share) 10,000.00 $ 180  
Exercise price (in dollars per share) $ 10,010.00 $ 180  
Dividend yield 0.00% 0.00% 0.00%
Expected volatility 60.00% 60.00% 60.00%
Risk-Free interest rate 0.63%    
Expected life (in years) 6 years 29 days    
Options | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock price (in dollars per share)     $ 0.61
Exercise price (in dollars per share)     $ 0.61
Risk-Free interest rate   0.14% 1.88%
Expected life (in years)   2 years 4 months 24 days 5 years 5 months 23 days
Options | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock price (in dollars per share)     $ 0.66
Exercise price (in dollars per share)     $ 0.66
Risk-Free interest rate   0.44% 2.99%
Expected life (in years)   6 years 29 days 6 years 29 days