Warrants - Summary of Warrants Outstanding and Exercisable (Details) - $ / shares	Sep. 30, 2020	Sep. 30, 2019
Series B Convertible Preferred Warrants Exercise Price $16.60
Class Of Warrant Or Right [Line Items]
Number of warrants outstanding and exercisable	54,396
Warrants exercise price, outstanding and exercisable	$ 16.60
Series B Convertible Preferred Warrants Exercise Price $16.80
Class Of Warrant Or Right [Line Items]
Number of warrants outstanding and exercisable	17,857
Warrants exercise price, outstanding and exercisable	$ 16.80
Series B Convertible Preferred Warrants Exercise Price $24.30
Class Of Warrant Or Right [Line Items]
Number of warrants outstanding and exercisable	12,383
Warrants exercise price, outstanding and exercisable	$ 24.30
Series B Convertible Preferred Warrants Exercise Price $28.50
Class Of Warrant Or Right [Line Items]
Number of warrants outstanding and exercisable	33,393
Warrants exercise price, outstanding and exercisable	$ 28.50
Series B Convertible Preferred Stock Warrants
Class Of Warrant Or Right [Line Items]
Number of warrants outstanding and exercisable	118,029	118,029
Warrants exercise price, outstanding and exercisable	$ 20.80	$ 20.80