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Commitments and Contingencies - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2022 | Dec. 31, 2020 | Jun. 30, 2022 | Sep. 30, 2020 | Sep. 30, 2018 | Sep. 30, 2024
Embolitech LLC [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Contingent payments upon achievement of regulatory milestones |  |  | $ 1,000,000.0 |  |  |
Installment payment beginning period |  |  | 2023 |  |  |
Installment payment ending period |  |  | 2024 |  |  |
CRO [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Contractual obligation remaining to be paid |  |  | $ 8,000,000 |  |  |
CRO [Member] | Minimum [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Gross contractual obligation |  |  | 37,000,000 |  |  |
CRO [Member] | Maximum [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Gross contractual obligation |  |  | 40,000,000 |  |  |
CRO [Member] | Maximum [Member] | CRO Pass-through Expenses [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Gross contractual obligation |  |  | $ 30,000,000 |  |  |
In Process Research and Development | Embolitech LLC [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Contingency period ending year |  |  | 2033 |  |  |
Payments to acquire in-process research and development | $ 500,000 | $ 1,000,000.0 |  | $ 1,000,000.0 | $ 5,000,000.0 |
In Process Research and Development | Embolitech LLC [Member] | Forecast [Member] |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |
Contractual obligation payable in fiscal 2022 through fiscal 2024 |  |  |  |  |  | $ 2,000,000.0

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