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Nature of business and organization - Liquidity and going concern (Details)
 1 Months Ended 12 Months Ended
Jul. 13, 2025
USD ($)
tranche
Jul. 31, 2025
USD ($)
tranche
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Nature of business and organization [Line Items]            
Net losses     $ (4,369,906) $ (18,284,958) $ (28,216,352) $ (28,216,352)
Net cash used in operating activities     2,290,607 7,929,234 $ 6,761,587  
Accumulated deficit     (88,265,410) (81,731,423)    
Cash and cash equivalents     $ 55,639 $ 1,409,070    
Subsequent Events | Senior Convertible Note (Series A-1, B-1, and C-1)            
Nature of business and organization [Line Items]            
Number of traches issued | tranche 3 3        
Aggregate gross proceeds $ 16,338,506 $ 16,338,506        
Subsequent Events | Equity Purchase Facility Agreement ("EPFA")            
Nature of business and organization [Line Items]            
Commitment amount $ 400,000,000