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Accumulated Losses and Reserves - Summary of Accumulated Losses and Reserves (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Disclosure Of Reserves Within Equity [Line Items]      
Net loss for the period $ (162,791) $ (220,242) $ (142,521)
Total reserves 43,938 37,809  
Movements in Accumulated Losses      
Disclosure Of Reserves Within Equity [Line Items]      
Beginning balance (579,704) (359,462)  
Net loss for the period (162,791) (220,242)  
Ending balance (742,495) (579,704) (359,462)
Reserves      
Disclosure Of Reserves Within Equity [Line Items]      
Fair value of Investments reserve 1,085 1,085  
Share-based payments reserve 22,764 16,636  
Foreign translation reserve 20,089 20,089  
Total reserves 43,938 37,810  
Movement in Fair Value of Investments Reserve      
Disclosure Of Reserves Within Equity [Line Items]      
Opening balance 1,085 1,085  
Closing balance 1,085 1,085 1,085
Movement in Share-Based Payments Reserve      
Disclosure Of Reserves Within Equity [Line Items]      
Opening balance 16,636 11,551  
Share-based payments reserve 6,128 5,085  
Closing balance 22,764 16,636 11,551
FX Translation Reserve      
Disclosure Of Reserves Within Equity [Line Items]      
Opening balance 20,089 20,089  
Closing balance $ 20,089 $ 20,089 $ 20,089