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Settlement of legal proceedings - Additional Information (Detail)
 12 Months Ended
Jun. 14, 2018
AUD ($)
shares
Jun. 30, 2019
AUD ($)
$ / shares
Jun. 30, 2018
AUD ($)
Jun. 30, 2017
AUD ($)
Disclosure of Legal Proceedings [line items]        
Extinguishment of convertible notes   $ 136,000    
Cash payments   0 $ 0  
Other income   1,465,000 $ 12,989,000 $ 8,563,000
Noxopharm Limited [member]        
Disclosure of Legal Proceedings [line items]        
Shares held in escrow | shares 5,970,714      
Settlement of legal proceedings $ 6,490,680 $ 1,770,000    
Number of unlisted options   3,000,000    
Excise price of unlisted options | $ / shares   $ 0.80    
Cash payments   $ 165,000    
Other income   8,410,680    
Change in equity   $ 136,000