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Significant accounting policies - Additional Information (Detail) - AUD ($)
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Disclosure of summary of significant accounting policies [line items]        
Consolidated loss after income tax $ 6,039,000 $ 10,670,000 $ 12,155,000  
Net current asset position 5,372,114 14,096,234    
Net cash outflows from operating activities 8,661,000 11,435,000 11,980,000  
Consolidated cash in hand and at bank 5,956,000 14,455,000 $ 33,453,000 $ 44,371,000
Current assets 9,260,000 $ 19,480,000    
Excess value of share $ 4,000,000      
Research and development tax incentive program [member]        
Disclosure of summary of significant accounting policies [line items]        
Additional tax deduction percentage 43.50%      
Bottom of range [member]        
Disclosure of summary of significant accounting policies [line items]        
Trade receivables settlement period 30 days      
Overdue period where trade receivables may be impaired 120 days      
Top of range [member]        
Disclosure of summary of significant accounting policies [line items]        
Trade receivables settlement period 60 days      
Trade and other payables payment period   30 days    
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      
Software [member] | Bottom of range [member]        
Disclosure of summary of significant accounting policies [line items]        
Useful lives of intangible assets 2.5 years      
Software [member] | Top of range [member]        
Disclosure of summary of significant accounting policies [line items]        
Useful lives of intangible assets 10 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