v3.26.3
Stockholders' equity - Schedule of warrants or rights (Detail) - $ / shares
 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Class of Warrant or Right [Line Items]    
Outstanding, beginning of period 20,443,496 34,271,146
Outstanding, ending of period 20,017,501 20,443,496
Weighted Average Exercise Price, beginning of period $ 0.9672 $ 1.8453
Weighted average exercise price, Purchase warrants expired   $ 178.5
Purchase warrants expired   (6,300)
Weighted Average Exercise Price, ending of period $ 0.9504 $ 0.9672
Series 2 Warrants [Member]    
Class of Warrant or Right [Line Items]    
Common warrants exercised (63,792) (1,553,927)
Pre-funded warrants exercised $ 1.9299 $ 1.9299
Common warrants [Member]    
Class of Warrant or Right [Line Items]    
Common warrants exercised (161,927) (10,192,840)
Pre-funded warrants exercised $ 3.86 $ 3.86
Pre-funded warrants [Member]    
Class of Warrant or Right [Line Items]    
Pre-funded warrants issued   300,000
Common warrants exercised (200,276) (2,374,583)
Pre-funded warrants issued   $ 0.0001
Pre-funded warrants exercised $ 0.0001 $ 0.0001