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Fair Value of Financial Instruments - Fair Value Measurement Inputs (Details)
Sep. 30, 2020
Sep. 30, 2019
Expected volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value, measurement input 0.937 0.750
Risk-free interest rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value, measurement input 0.004 0.022
Expected dividend yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value, measurement input 0 0
Expected term (years)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Fair value, measurement input 4.9 6.9