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Commitments and contingencies - Lease Contracts (Detail)
$ in Thousands
 1 Months Ended 12 Months Ended
Jul. 28, 2021
USD ($)
ft²
Apr. 14, 2021
USD ($)
ft²
Apr. 13, 2021
USD ($)
ft²
Feb. 06, 2020
USD ($)
Dec. 31, 2020
USD ($)
ft²
item
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Operating lease expense           $ 9,500 $ 7,900
Operating lease payment           $ 8,000  
Lease weighted-average remaining lease term           17 years 3 months 18 days  
Lease weighted average discount rate           6.40%  
Anticipated receipt of the tenant incentive           $ 17,628  
Change in right-of-use asset           27,900 2,100
Change in operating lease liabilities.           30,100 $ 3,100
Non-cancelable operating lease payments in 2022           8,986  
Future minimum payments           134,239  
First Lease Amendment [Member]              
Operating lease area | ft²     101,000        
Initial annual base rent     $ 1,200        
Extension of lease term     10 years        
Future minimum payments     $ 17,600     17,600  
Percentage of increases base rental payments relating to original premises     3.00%        
Percentage of obligated to payment of operating expenses     26.00%        
Tenant improvement allowance connection with improvements to additional premises     $ 4,300        
Agilent [Member]              
Litigation settlement amount       $ 22,500      
Number of days from the settlement agreement pursuant to which litigation claims are to be settled       14 days      
Wilsonville Oregon [Member]              
Operating lease area | ft²         111,000    
Operating lease term         12 years    
Operating lease security deposit with the lessor         $ 1,000    
Initial annual base rent         $ 1,700    
Operating lease base rent annual percentage increase         3.00%    
Tenant improvement allowance from lessor         $ 13,300    
Number of extensions | item         2    
Extension of lease term         5 years    
Future minimum payments           $ 27,900  
Brisbane California [Member]              
Operating lease area | ft²   15,500          
Operating lease term   5 years          
Security deposit   $ 200          
Initial annual base rent   $ 300          
Operating lease base rent annual percentage increase   3.00%          
Future minimum payments   $ 2,200          
South San Francisco, California [Member]              
Operating lease area | ft² 21,000            
Operating lease term 7 years            
Security deposit $ 200            
Initial annual base rent $ 1,700            
Operating lease base rent annual percentage increase 3.00%            
Future minimum payments $ 13,100