Liquidity (Details) - USD ($)			1 Months Ended			2 Months Ended	12 Months Ended
	Dec. 22, 2022	Sep. 11, 2017	Dec. 31, 2022	Nov. 30, 2021	Feb. 28, 2021	Nov. 30, 2022	Sep. 30, 2022	Sep. 30, 2021
Liquidity
Accumulated deficit							$ 408,935,518	$ 342,883,254
Total debt							11,114,518	11,842,345
Proceeds from issuance of stock							$ 62,307,307	46,301,841
Shares of common stock issuable upon exercise of warrants							6,812,794
Unamortized discount							$ 199,503	52,291
Proceeds from debt							$ 10,000,000	$ 10,000,000
2022 Note
Liquidity
Original principal amount	$ 31,800,000
Unamortized discount	$ 1,800,000
Interest rate (as a percent)	9.50%
Net proceeds (repayments) debt	$ 17,800,000
Net proceeds from debt			$ 17,800,000
ATM Offering
Liquidity
Sale of common stock, net of issuance costs (in shares)						895,391	4,808,269	2,855,190
Proceeds from issuance of stock						$ 1,100,000	$ 8,600,000	$ 7,200,000
Direct registered offering
Liquidity
Sale of common stock, net of issuance costs (in shares)			28,460,831
Shares issued price (in dollars per share)			$ 0.8784
Proceeds from issuance of stock			$ 24,000,000.0
Direct registered offering | GMS Ventures & Investments
Liquidity
Sale of common stock, net of issuance costs (in shares)			14,230,418
Direct registered offering | M.S. Howells & Co
Liquidity
Shares of common stock issuable upon exercise of warrants			515,755
Exercise price per share			$ 1.05
Warrants exercise term			3 years
Private Placement
Liquidity
Sale of common stock, net of issuance costs (in shares)					3,000,000
Shares issued price (in dollars per share)					$ 1.00
Proceeds from issuance of stock					$ 3,000,000.0
Private Placement | GMS Ventures & Investments
Liquidity
Sale of common stock, net of issuance costs (in shares)		1,013,627
Shares issued price (in dollars per share)		$ 1.00
Proceeds from issuance of stock		$ 1,000,000.0
Underwritten Public Offering
Liquidity
Sale of common stock, net of issuance costs (in shares)				46,000,000	38,593,767
Shares issued price (in dollars per share)				$ 1.25	$ 1.00
Proceeds from issuance of stock				$ 54,000,000.0	$ 35,500,000
Shares of common stock issuable upon exercise of warrants				2,100,000	2,116,364
Exercise price per share				$ 1.5625	$ 1.25
Warrants exercise term				5 years	5 years
Underwritten Public Offering | GMS Ventures & Investments
Liquidity
Sale of common stock, net of issuance costs (in shares)				16,000,000	8,360,000