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Property and equipment, net - Summary of property and equipment net (Detail) - USD ($)
$ in Thousands
Jun. 30, 2025
Jun. 30, 2024
Property, Plant and Equipment [Line Items]    
Total property and equipment, gross $ 1,601 $ 1,583
Accumulated depreciation and amortization (1,470) (1,404)
Total property and equipment, net 131 179
Software [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment, gross 6 6
Lab equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment, gross 1,533 1,521
Computer hardware [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment, gross 32 32
Furniture and fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment, gross 6 0
Leasehold improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total property and equipment, gross $ 24 $ 24