Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Anti-dilutive Securities (Details)

v3.21.4
Summary of Significant Accounting Policies - Anti-dilutive Securities (Details) - shares
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potentially dilutive securities (in shares) 25,281,983 9,859,674 8,575,335
Warrants to purchase shares of common stock      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potentially dilutive securities (in shares) 14,166,666 0 0
Options to purchase shares of common stock      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potentially dilutive securities (in shares) 8,978,185 9,859,674 8,575,335
Restricted shares of common stock      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Potentially dilutive securities (in shares) 2,137,132 0 0