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Cash Flow Statements Reconciliation - Summary of Cash Flow Statements Reconciliation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
(a) Reconciliation to cash at the end of the year        
Cash at bank and in hand $ 48,443 $ 172,471 $ 89,189  
Cash and cash equivalents 48,443 172,471 89,189 $ 44,631
(b) Reconciliation of net loss after tax to net cash flows from operations        
Net loss for the year (162,791) (220,242) (142,521)  
Adjustments for:        
Income tax benefit recognized in profit or loss (6,947) (9,412) (5,926)  
Net loss of disposal of non-current assets 3      
Write off of Property Plant and Equipment 50      
Depreciation of non-current assets 7 19 17  
Depreciation of right-of-use assets 84 84 84  
Interest expense on DFA* (includes amounts to related parties $32,793 (2024: $24,699, 2023: $13,462)) [1] 46,457 30,263 13,462  
Gain on remeasurement of financial liability - DFA 0 (387) (12,302)  
Fair value (gain)/loss on Investor options (28,283) 11,224 0  
Share-based payments expense 6,128 5,085 5,835  
Net foreign exchange differences 1,334 107 489  
Adjustments to reconcile profit (loss) 18,833 36,983 1,659  
Changes in:        
Payables (29,517) 19,503 7,297  
Receivables 1,007 (790) 379  
Prepayments 3,614 (1,675) 6,142  
Provisions 112 266 137  
Net cash flows used in operating activities before tax (168,742) (165,955) (126,907)  
R&D tax incentive received 10,398 5,926 6,299  
Current US tax paid (300) (986)    
Net cash flows used in operating activities $ (158,644) $ (161,015) $ (120,608)  
[1] Development Funding Agreement ("DFA")