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Significant accounting policies - Additional Information (Detail) - AUD ($)
 1 Months Ended 12 Months Ended
Oct. 16, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Disclosure of summary of significant accounting policies [line items]          
Consolidated loss after income tax   $ 12,467,000 $ 10,270,000 $ 6,039,000  
Net current asset position   5,586,128 5,613,883    
Net cash outflows from operating activities   8,810,000 6,714,000 8,660,000  
Consolidated cash in hand and at bank   8,764,000 5,434,000 5,956,000 $ 14,455,000
Shares issued during the period value   12,972,000 $ 5,406,000 $ 30,000  
Sale Of Stock Through Underwriting Process [Member]          
Disclosure of summary of significant accounting policies [line items]          
Shares issued during the period value $ 24,000,000        
Clinical Trials [Member] | Covid Ninteen [Member]          
Disclosure of summary of significant accounting policies [line items]          
Proceeds from funding for project purpose   $ 9,000,000      
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