Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity - Fair value of advisory warrants (Details)

v3.21.4
Stockholders' Equity - Fair value of advisory warrants (Details)
Sep. 30, 2021
Y
Sep. 30, 2020
Y
Remaining contractual term (years)    
Class of Stock [Line Items]    
Warrants and Rights Outstanding, Measurement Input 3.0 3.0
Common stock price volatility    
Class of Stock [Line Items]    
Warrants and Rights Outstanding, Measurement Input 83.9 86.4
Risk-free interest rate    
Class of Stock [Line Items]    
Warrants and Rights Outstanding, Measurement Input 0.5 0.2