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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
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