Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Key Assumptions Estimate Fair Value Of Stock Options (Details)

v3.20.4
Stock-Based Compensation - Key Assumptions Estimate Fair Value Of Stock Options (Details)
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Key assumptions used to estimate the fair value of the stock options granted    
Expected common stock price volatility, minimum 78.00% 75.60%
Expected common stock price volatility, maximum 84.30% 78.40%
Risk-free interest rate, minimum 0.20% 1.80%
Risk-free interest rate, maximum 1.80% 2.50%
Expected dividend yield 0.00% 0.00%
Minimum    
Key assumptions used to estimate the fair value of the stock options granted    
Expected term of options (years) 6 years 1 year 7 months 6 days
Maximum    
Key assumptions used to estimate the fair value of the stock options granted    
Expected term of options (years) 7 years 7 years