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Financial risk management - Additional Information (Details) - USD ($)
 6 Months Ended 12 Months Ended
Dec. 31, 2023
Jun. 30, 2023
Disclosure of Financial Risk Management [Line Items]    
Percentage of forecast net sales 20.00%  
Non-cancellable purchase commitments related to raw materials, manufacturing agreements and other goods and services $ 5,700,000  
Other purchase commitments 0  
Manufacturing Service Agreement    
Disclosure of Financial Risk Management [Line Items]    
Minimum financial commitment reduction amount 7,400,000  
Minimum financial commitment reduction amount on lease component 1,500,000  
Minimum financial commitment reduction amount on non lease component 5,900,000  
Lonza Bioscience Singapore Pte. Ltd | Manufacturing Service Agreement    
Disclosure of Financial Risk Management [Line Items]    
Minimum remaining financial commitment of non-lease component on exercise of option to extend non-cancellable term 12,700,000  
Minimum financial commitment of lease component on exercise of option to extend non-cancellable term $ 2,500,000  
Interest Rate Risk    
Disclosure of Financial Risk Management [Line Items]    
Effect on profit from change in interest rates 10.00% 10.00%
Liquidity Risk    
Disclosure of Financial Risk Management [Line Items]    
Non interest bearing financial liabilities maturity period 6 months 6 months
USD | Currency Risk    
Disclosure of Financial Risk Management [Line Items]    
Percentage of cash held 68.00% 67.00%
AUD | Currency Risk    
Disclosure of Financial Risk Management [Line Items]    
Percentage of cash held 31.00% 33.00%
Other Currency | Currency Risk    
Disclosure of Financial Risk Management [Line Items]    
Percentage of cash held 1.00%