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SUBSEQUENT EVENTS - Exchange Agreement (Convertible Debt to Equity Conversion) - (Details) - USD ($) | Oct. 25, 2021 | May 07, 2021 | Sep. 30, 2021 | Sep. 30, 2020
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Subsequent Event [Line Items] |  |  |  |
Preferred Stock, Par or Stated Value Per Share |  | $ 0.001 | $ 0.001 | $ 0.001
Threshold expiry period for right to purchase additional preferred stock from merger closing date |  | 12 months |  |
Subsequent event | Mullen Technologies, Inc | Series C Preferred Stock |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Debt Securities | $ 1,100,000 |  |  |
Preferred Stock, Par or Stated Value Per Share | $ 0.001 |  |  |
Threshold expiry period for right to purchase additional preferred stock from merger closing date | 12 months |  |  |

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