StockBased Compensation  Key assumptions used to estimate the fair value of the stock options granted (Details) 
3 Months Ended  

Dec. 31, 2022 
Dec. 31, 2021 

Key assumptions used to estimate the fair value of the stock options granted  
Expected common stock price volatility, minimum  79.20%  73.80% 
Expected common stock price volatility, maximum  82.40%  74.50% 
Riskfree interest rate, minimum  3.80%  1.10% 
Riskfree interest rate, maximum  4.30%  1.40% 
Minimum  
Key assumptions used to estimate the fair value of the stock options granted  
Expected term of options (years)  5 years 3 months 18 days  5 years 1 month 6 days 
Maximum  
Key assumptions used to estimate the fair value of the stock options granted  
Expected term of options (years)  6 years 1 month 6 days  6 years 1 month 6 days 
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 References No definition available.

X  
 Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probabilityweighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. No definition available.

X  
 Definition The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probabilityweighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. No definition available.

X  
 Definition The maximum riskfree interest rate assumption that is used in valuing an option on its own shares. No definition available.

X  
 Definition The minimum riskfree interest rate assumption that is used in valuing an option on its own shares. No definition available.

X  
 Definition Expected term of award under sharebased payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/disclosureRef

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