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Commitments and Contingencies - Additional Information (Detail)
 1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2019
USD ($)
ft²
Jan. 31, 2019
ft²
Jun. 30, 2019
USD ($)
ft²
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
ft²
Jun. 30, 2018
USD ($)
Oct. 31, 2018
USD ($)
Other Commitments [Line Items]              
Estimated lease payments     $ 23,318,048   $ 23,318,048    
Facility rent expense     418,500 $ 324,600 1,189,800 $ 954,900  
Provision for recorded liabilities     0   0    
Future commitments     53,800,000   53,800,000    
Commitments expected to be incurred in fiscal 2019     11,500,000   11,500,000    
Commitments expected to be incurred beyond fiscal 2019     42,300,000   42,300,000    
Technology License Commitments              
Other Commitments [Line Items]              
Milestone payments     $ 0 $ 0 $ 0 $ 0  
Corporate Headquarters In Pasadena | California              
Other Commitments [Line Items]              
Office space leases, in square feet | ft²     8,500   8,500    
Operating lease expiration month and year         2019-09    
Rental expense         $ 31,900    
Percentage of increase in annual rental cost         3.00%    
Corporate Headquarters In Pasadena | California | Colorado Owner, LLC              
Other Commitments [Line Items]              
Office space leases, in square feet | ft² 24,000            
Lease term 91 months            
Lease payments, commencement date Nov. 01, 2019            
Estimated lease payments $ 8,800,000            
Expected leasehold improvements, net of tenant improvement allowances $ 3,800,000            
Research Facility in Madison | Wisconsin              
Other Commitments [Line Items]              
Office space leases, in square feet | ft²   13,000 58,000   58,000    
Operating lease expiration month and year   2029-09          
Primary tenant improvement allowance accounted for as deferred rent     $ 2,100,000   $ 2,100,000    
Promissory note payable     $ 2,700,000   2,700,000   $ 2,300,000
Rental expense including payments of principal and interest on the note payable         $ 154,800    
Percentage of increase in annual rental cost excluding principal and interest on the note payable         2.50%