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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 |  |  |  |  |  |

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