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Convertible notes payable (Details) - USD ($)
12 Months Ended
Jul. 10, 2020
Jun. 22, 2020
Nov. 01, 2018
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Sep. 20, 2021
Jul. 22, 2021
Jul. 21, 2021
May 31, 2021
May 04, 2021
Mar. 29, 2021
Sep. 12, 2020
Sep. 11, 2020
Mar. 10, 2020
Debt Conversion [Line Items]                              
Number of investor warrant issued to purchase       275,114,477                      
Investor warrants exercise price             $ 0.22     $ 0.0001 $ 0.30 $ 1.15      
Ordinary shares, par value (in dollars per share)       $ 0.001       $ 0.001 $ 0.001       $ 0.001 $ 0.001  
Notes repaid in cash       $ 2,147,199 $ 938,071 $ 87,800                  
Shares converted   8,585,702                          
Amount converted   $ 6,100,000                          
Incremental value from modification of warrants       $ 455,364                      
Fair value of notes         $ 0                    
Intrinsic value of the BCF     $ 670,618                        
Total debt discount     3,206,932                        
Notes                              
Debt Conversion [Line Items]                              
Notes repaid in cash   $ 2,600,000                          
Investor Warrants [Member]                              
Debt Conversion [Line Items]                              
Fair value of investor warrants     1,496,153                        
Private placement | One institutional investor | Securities purchase agreement                              
Debt Conversion [Line Items]                              
Amount of aggregate principal securities sold under private placement     $ 7,500,000                        
Number of aggregate principal securities sold under private placement     800,000                        
Investor warrants exercise price     $ 6.53                        
Ordinary shares, par value (in dollars per share)     $ 0.001                        
Interest rate     10.00%                        
Percentage of warrants issued to purchase note     10.00%                        
Private placement | One institutional investor | Securities purchase agreement | Notes                              
Debt Conversion [Line Items]                              
Amount of aggregate principal securities sold under private placement     $ 7,500,000                        
Number of aggregate principal securities sold under private placement     1,198,084                        
Sale of stock, price per share     $ 6.26                        
Private placement | Investor Warrants [Member] | One institutional investor                              
Debt Conversion [Line Items]                              
Number of investor warrant issued to purchase     119,808                        
Private placement | Placement agent warrants | One institutional investor                              
Debt Conversion [Line Items]                              
Investor warrants exercise price     $ 7.183                        
Term of placement agent warrants     4 years                        
Private placement | Placement agent warrants | One institutional investor | Securities purchase agreement                              
Debt Conversion [Line Items]                              
Number of investor warrant issued to purchase     119,808                        
Investor warrants exercise price     $ 7.183                       $ 2
Percentage of warrants issued to purchase note 10.00%   10.00%                        
Term of placement agent warrants     4 years                        
Private placement | Placement agent warrants | One institutional investor | Securities purchase agreement | Minimum                              
Debt Conversion [Line Items]                              
Number of investor warrant issued to purchase 119,808                            
Private placement | Placement agent warrants | One institutional investor | Securities purchase agreement | Maximum                              
Debt Conversion [Line Items]                              
Number of investor warrant issued to purchase 812,694