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Commitments and Contingencies - Additional Information (Detail) - USD ($) | 12 Months Ended | 24 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2018 | Sep. 30, 2024
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Other long-term liabilities | $ 8,060,000 | $ 10,773,000 |  |  |  |
Other accrued liabilities current | 535,000 | 551,000 |  |  |  |
Embolitech LLC [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Contingent payments upon achievement of regulatory milestones | $ 1,000,000 |  |  |  |  |
Installment payment period | 2024 |  |  |  |  |
CRO [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Contractual obligation remaining to be paid | $ 2,000,000 |  |  |  |  |
CRO [Member] | Minimum [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Gross contractual obligation | 39,000,000 |  |  |  |  |
CRO [Member] | Maximum [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Gross contractual obligation | 41,000,000 |  |  |  |  |
CRO [Member] | Maximum [Member] | CRO Pass-through Expenses [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Gross contractual obligation | 27,000,000 |  |  |  |  |
In-Process Research and Development [Member] | Embolitech LLC [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Payments to acquire in-process research and development | $ 1,000,000 | $ 500,000 | $ 1,000,000.0 | $ 1,000,000.0 | $ 5,000,000.0 |
Contingency period ending year | 2033 |  |  |  |  |
In-Process Research and Development [Member] | Embolitech LLC [Member] | Forecast [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Contractual obligation payable in fiscal 2022 through fiscal 2024 |  |  |  |  |  | $ 900,000

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