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Non-current assets - intangibles - Summary of reconciliations of intangibles (Detail) - AUD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Disclosure of detailed information about intangible assets [line items]      
Beginning balance $ 14,579 $ 15,918  
Additions   0  
Disposals   (3)  
Amortisation expense (1,084) (1,336) $ (1,320)
Ending balance 13,494 14,579 15,918
Software [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance   5  
Disposals   (3)  
Amortisation expense   (2) (5)
Ending balance     5
Patents and intellectual property [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance   250  
Amortisation expense   (250) (570)
Ending balance     250
GDC licensing agreement [member]      
Disclosure of detailed information about intangible assets [line items]      
Beginning balance 14,579 15,663  
Amortisation expense (1,084) (1,084) (745)
Ending balance $ 13,494 $ 14,579 $ 15,663