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Significant accounting policies - Additional Information (Detail) - AUD ($)
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Jul. 01, 2018
Jun. 30, 2016
Disclosure of summary of significant accounting policies [line items]          
Financial assets available-for-sale   $ 3,679,542      
Available for sale reserve $ (36,824)     $ 36,824  
Consolidated loss after income tax 10,270,000 6,039,000 $ 10,670,000    
Net current asset position 5,273,710 5,372,114      
Net cash outflows from operating activities 6,714,000 8,661,000 11,435,000    
Consolidated cash in hand and at bank 5,434,000 5,956,000 $ 14,455,000   $ 33,453,000
Current assets $ 7,515,000 $ 9,260,000      
Research and development tax incentive program [member]          
Disclosure of summary of significant accounting policies [line items]          
Additional tax deduction percentage 43.50%        
Top of range [member] | Research and development tax incentive program [member]          
Disclosure of summary of significant accounting policies [line items]          
Earning income $ 20,000,000        
Patents and intellectual property [member]          
Disclosure of summary of significant accounting policies [line items]          
Useful lives of intangible assets 5 years        
Licensing agreement for GDC-0084 [member]          
Disclosure of summary of significant accounting policies [line items]          
Remaining useful life,licensing agreement 15 years        
Plant and equipment [member] | Bottom of range [member]          
Disclosure of summary of significant accounting policies [line items]          
Estimated useful life of assets 2.5 years        
Plant and equipment [member] | Top of range [member]          
Disclosure of summary of significant accounting policies [line items]          
Estimated useful life of assets 10 years