Summary of significant accounting policies - Schedule Of Estimated Lives of Property And Equipment (Details) |
12 Months Ended |
|---|---|
Sep. 30, 2022 | |
| Laboratory equipment | |
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |
| Property, plant and equipment, useful life | 5 years |
| Furniture, fixtures and other equipment | |
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |
| Property, plant and equipment, useful life | 5 years |
| Computer equipment | |
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |
| Property, plant and equipment, useful life | 3 years |
| Computer software | |
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |
| Property, plant and equipment, useful life | 3 years |