Common Stock, Convertible Preferred Stock and Stockholders' Equity (Deficit) - Warrants (Details) - USD ($)			3 Months Ended		6 Months Ended
	Mar. 19, 2020	Jan. 27, 2020	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Mar. 23, 2020	Dec. 23, 2019	Apr. 12, 2019
Convertible Preferred Stock And Stockholders' Equity (Deficit) [Line Items]
Shares of common stock issuable upon exercise of warrants			6,463,338		6,463,338
Net proceeds						$ 19,800,000
Deemed dividend upon modification of warrants			$ 1,431,406	$ 829,530	$ 3,140,009	$ 829,530
Number of share issued	7,244,739					2,680,390
Common stock repurchase note
Convertible Preferred Stock And Stockholders' Equity (Deficit) [Line Items]
Number of share issued			10,059,056		10,059,056
Warrant
Convertible Preferred Stock And Stockholders' Equity (Deficit) [Line Items]
Exercise price per share		$ 0.232	$ 0.232		$ 0.232		$ 0.232	$ 0.2320	$ 2.90
Shares of common stock issuable upon exercise of warrants		4,657,852	15,085,240		15,085,240
Net proceeds		$ 1,100,000
Number of share issued			13,003,414
Warrant expired (in shares)			80,797		80,797
Warrants expired (in dollars per share)			$ 0.08		$ 0.08
Warrant, 15 Months
Convertible Preferred Stock And Stockholders' Equity (Deficit) [Line Items]
Warrants exercise term								15 months
Shares of common stock issuable upon exercise of warrants			10,157,050		10,157,050
Warrant, 5 Years
Convertible Preferred Stock And Stockholders' Equity (Deficit) [Line Items]
Warrants exercise term								5 years