Fair Value of Financial Instruments - Summary of Fair Value of Warrant Options Associated with Issuance of Redeemable Preferred Stock (Details)	Jul. 30, 2020	Apr. 30, 2020	Apr. 13, 2020	Sep. 30, 2019	Oct. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assumptions used in calculating fair value of the warrant option			10 years
Series A-1 Preferred Stock Warrant Option
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assumptions used in calculating fair value of the warrant option					10 years
Series A-2 Preferred Stock Warrant Option
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assumptions used in calculating fair value of the warrant option		10 years
Common Stock Value (per Share) | Series A-1 Preferred Stock Warrant Option
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assumptions used in calculating fair value of the warrant option	22.22			31.60
Common Stock Value (per Share) | Series A-2 Preferred Stock Warrant Option
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assumptions used in calculating fair value of the warrant option	22.22
Expected Volatility | Series A-1 Preferred Stock Warrant Option
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assumptions used in calculating fair value of the warrant option	0.4435			0.4763
Expected Volatility | Series A-2 Preferred Stock Warrant Option
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assumptions used in calculating fair value of the warrant option	0.4435
Risk-free Interest Rate | Series A-1 Preferred Stock Warrant Option
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assumptions used in calculating fair value of the warrant option	0.0055			0.0168
Risk-free Interest Rate | Series A-2 Preferred Stock Warrant Option
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assumptions used in calculating fair value of the warrant option	0.0055
Expected Life (Years) | Series A-1 Preferred Stock Warrant Option
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assumptions used in calculating fair value of the warrant option	10 years			10 years
Expected Life (Years) | Series A-2 Preferred Stock Warrant Option
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Assumptions used in calculating fair value of the warrant option	10 years