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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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