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Commitments and Contingencies - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended 36 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
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 2022          
Installment payment ending period 2024          
CRO [Member]            
Commitments And Contingencies [Line Items]            
Contractual obligation remaining to be paid $ 7,000,000          
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 29,000,000          
In-Process Research and Development [Member] | Embolitech LLC [Member]            
Commitments And Contingencies [Line Items]            
Payments to acquire in-process research and development $ 1,000,000.0   $ 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           $ 2,500,000
In-Process Research and Development [Member] | Medical Device [Member]            
Commitments And Contingencies [Line Items]            
Payments to acquire in-process research and development   $ 200,000   $ 800,000    
Contingent payments upon achievement of regulatory milestones $ 1,100,000          
Contingency period ending year 2022