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Commitments and Contingencies - Additional Information (Detail) | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | 60 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) | Sep. 30, 2019 USD ($) | Mar. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) € / $ | Jun. 30, 2020 EUR (€) | Sep. 30, 2018 USD ($) | Sep. 30, 2024 USD ($)
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Additional payments for acquisition of in-process research and development |  |  |  | $ 1,000,000 |  |  |
Other long-term liabilities |  | $ 5,512,000 |  | 7,865,000 |  |  |
Embolitech LLC [Member] |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Contingent payments upon achievement of regulatory milestones |  |  | $ 2,000,000.0 |  |  |  |
Installment payment beginning period |  |  | 2022 |  |  |  |
Installment payment ending period |  |  | 2024 |  |  |  |
CRO [Member] |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Contractual obligation remaining to be paid |  |  |  | 10,000,000 |  |  |
CRO [Member] | Minimum [Member] |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Gross contractual obligation |  |  |  | 35,000,000 |  |  |
CRO [Member] | Maximum [Member] |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Gross contractual obligation |  |  |  | 40,000,000 |  |  |
CRO [Member] | CRO Pass-through Expenses [Member] |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Gross contractual obligation |  |  |  | 26,000,000 |  |  |
Intellectual Property [Member] | Medical Device [Member] |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Payments to acquire intellectual property assets |  | 800,000 |  |  |  |  |
Contingent payments upon achievement of regulatory milestones |  | $ 1,300,000 |  |  |  |  |
Contingency period ending year |  | 2022 |  |  |  |  |
Estimated additional payment to acquire intellectual property assets |  | $ 200,000 |  |  |  |  |
Intellectual Property [Member] | Embolitech LLC [Member] |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
Contingency period ending year |  |  | 2033 |  |  |  |
Additional payments for acquisition of in-process research and development | $ 1,000,000.0 |  |  |  |  |  |
Payments upon initial acquisition of in-process research and development |  |  |  |  |  | $ 5,000,000.0 |
Contractual obligation payable in fiscal 2022 through fiscal 2024 |  |  |  |  |  |  | $ 2,500,000
Other accrued liabilities noncurrent |  | 1,000,000.0 |  | 100,000 |  |  |
Other long-term liabilities |  | $ 2,100,000 |  | $ 2,200,000 |  |  |
Intellectual Property [Member] | InnoCore Technologies BV [Member] |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |
License agreement commencement year |  |  |  | 2006 | 2006 |  |
Annual minimum payments for licenses |  |  |  | $ 225,000 | € 200,000 |  |
Exchange rate relating to license payment | € / $ |  |  |  | 1.1228 |  |  |
Patent expiry date |  |  |  | 2027-09 | 2027-09 |  |
Future minimum payments associated with license |  |  |  | $ 1,700,000 |  |  |

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