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Segment reporting - Summary of Potential format for reporting the results of the Company's reportable segment (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Royalties and license fees $ 0 $ 0 $ 0 $ (108)
Research and development 2,867 3,585 18,332 15,609
General and administrative 6,967 2,206 23,433 6,989
Other segment items 1,029 732 3,848 739
Net loss $ (8,805) $ (5,059) (37,917) (21,751)
Reportable Segment, Aggregation before Other Operating Segment [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Royalties and license fees     0 (108)
Research and development     18,332 15,609
General and administrative     23,433 6,989
Other Operating Segment [Member]        
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]        
Other segment items     $ (3,848) $ (739)