Quarterly report pursuant to Section 13 or 15(d)

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

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Stock-Based Compensation - Key Assumptions Estimate Fair Value Of Stock Options (Details)
3 Months Ended 6 Months Ended
Dec. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Key assumptions used to estimate the fair value of the stock options granted      
Expected term of options (years)   7 years  
Expected common stock price volatility, minimum 7.00% 78.00%  
Expected common stock price volatility, maximum   83.50%  
Risk-free interest rate, minimum   0.90%  
Risk-free interest rate, maximum   1.80%  
Minimum      
Key assumptions used to estimate the fair value of the stock options granted      
Expected term of options (years)     5 years 6 months
Maximum      
Key assumptions used to estimate the fair value of the stock options granted      
Expected term of options (years)     6 years