Quarterly report pursuant to Section 13 or 15(d)

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

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Stockholders' equity - Schedule of warrants or rights (Detail) - $ / shares
 3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Outstanding, beginning of period   33,476,440 2,348,039
Outstanding, ending of period 33,299,080   33,476,440
Outstanding and exercisable 33,299,080 33,431,440  
Exercise price of class of warrants or rights outstanding   $ 1.98 $ 1.92
Exercise price of class of warrants or rights outstanding     $ 1.98
Outstanding and exercisable $ 1.99 $ 1.98  
Series 2 Warrants [Member]      
Pre-funded warrants exercised   20,000  
Pre-funded warrants exercised   $ 1.93  
Common warrants [Member]      
Common warrants issued     16,002,175
Common warrants issued     $ 3.86
Pre-funded warrants [Member]      
Pre-funded warrants issued     15,126,226
Pre-funded warrants exercised 132,360 25,000  
Pre-funded warrants issued     $ 0.0001
Pre-funded warrants exercised $ 0.001 $ 0.0001