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DEBT - Convertible Notes (Details)
12 Months Ended
May 26, 2021
USD ($)
$ / shares
May 07, 2021
item
$ / shares
shares
Sep. 30, 2021
USD ($)
$ / shares
Nov. 04, 2021
shares
Sep. 03, 2021
USD ($)
$ / shares
Aug. 19, 2021
$ / shares
Jul. 26, 2021
$ / shares
Jul. 22, 2021
$ / shares
Sep. 30, 2020
USD ($)
$ / shares
Debt Instrument [Line Items]                  
Interest rate (as a percent)         15.00%        
beneficial conversion feature $ 673,184                
unamortized discount $ 3,726,816   $ 8,060,555   $ 660,000       $ 1,401,062
Additional warrants | shares       1,478,752          
Preferred Stock Par value | $ / shares   $ 0.001 $ 0.001           $ 0.001
Number of convertible debt | item   4              
Warrants Term     5 years            
Percentage of MTI common shares     6.00%            
Warrants exercise price | $ / shares $ 0.6877   $ 0.6877   $ 0.6877 $ 0.6877 $ 0.6877 $ 0.6877  
Convertible Debt                  
Debt Instrument [Line Items]                  
Unsecured convertible notes     $ 10,762,500            
Interest rate (as a percent)     15.00%            
Percentage of quarterly interest payments     20.00%            
Debt instrument term     1 year            
beneficial conversion feature     $ 10,613,630            
unamortized discount     8,060,555            
Additional warrants | shares   1,866,665              
Convertible Debt | MTI common stock                  
Debt Instrument [Line Items]                  
Unsecured convertible notes     $ 6,418,500