v3.22.2.2
Commitments and Contingencies - Additional Information (Details)
ft² in Thousands
 12 Months Ended
Dec. 20, 2021
USD ($)
a
ft²
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Other Commitments [Line Items]        
Contingent liabilities   $ 0    
Tax increment financing award $ 16,000,000      
State income tax credits 2,500,000      
Technology License Commitments | ARO-ENaC and ARO-HIF2 Candidates        
Other Commitments [Line Items]        
Milestone payments   $ 0 $ 2,400,000 $ 0
Facilities | Minimum        
Other Commitments [Line Items]        
Amount intends to invest for buildout of facilities 200,000,000      
Facilities | Maximum        
Other Commitments [Line Items]        
Amount intends to invest for buildout of facilities $ 260,000,000      
Wisconsin | Verona Technology Park        
Other Commitments [Line Items]        
Land purchased (in acres) | a 13      
Wisconsin | Drug Manufacturing Facility        
Other Commitments [Line Items]        
Planned area of site (in sq ft) | ft² 160      
Wisconsin | Laboratory And Office Facility        
Other Commitments [Line Items]        
Planned area of site (in sq ft) | ft² 140