Quarterly report pursuant to Section 13 or 15(d)

Stockholders' equity - Schedule of warrants or rights (Detail)

v3.23.1
Stockholders' equity - Schedule of warrants or rights (Detail) - $ / shares
3 Months Ended 9 Months Ended
Dec. 31, 2022
Sep. 30, 2022
Mar. 31, 2023
Outstanding, beginning of period 42,088,194 107,095 107,095
Pre-funded warrants exercised 2,171,628    
Outstanding, ending of period   42,088,194 39,916,566
Exercisable at March 31, 2023     39,916,566
Exercise price of class of warrants or rights outstanding $ 0.49 $ 10.5 $ 10.5
Pre-funded warrants exercised $ 0.0001    
Exercise price of class of warrants or rights outstanding   $ 0.49 0.52
Exercisable at March 31, 2023     $ 0.52
Series 2 Warrants [Member]      
Series 2 Warrants issued September 15, 2022   29,809,471  
Series 2 Warrants issued September 15, 2022   $ 0.66  
Pre-funded warrants [Member]      
Pre-funded warrants issued   12,171,628  
Pre-funded warrants issued   $ 0.0001