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Accounts receivable, net - Additional information (Details) - USD ($) | Jan. 25, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | --- | --- | --- | ---
Product Information [Line Items] |  |  |  |  |
Accounts receivable |  | $ 24,473,318 | $ 10,493,069 |  |
Allowance for doubtful accounts |  | $ 8,094 | $ 119,199 | $ 0 | $ 0
Subsequent Event Member | Accounts receivable |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Accounts receivable | $ 19,700,000 |  |  |  |
Subsequent Event Member | Customer concentration risk | Accounts receivable | Customer |  |  |  |  |
Product Information [Line Items] |  |  |  |  |
Percentage of accounts receivable | 80.50% |  |  |  |

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