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Expenses - Summary of expenses (Detail) - AUD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Loss before income tax includes the following specific      
Depreciation   $ 211 $ 99
Amortisation $ 1,084 1,336 1,320
Total depreciation and amortisation 1,084 1,547 1,419
Impairment of property, plant and equipment 1 143  
Interest and finance charges paid/payable     1
Unwinding of the discount on contingent consideration     764
Finance costs expensed     765
Minimum lease payments 79 301 335
Defined contribution superannuation expense 128 170 288
Employee benefits expense excluding superannuation 1,396 2,213 4,078
Revaluation of contingent consideration 63    
Patents and intellectual property [member]      
Loss before income tax includes the following specific      
Amortisation   250 570
Software [member]      
Loss before income tax includes the following specific      
Amortisation   2 5
GDC licensing agreement [member]      
Loss before income tax includes the following specific      
Amortisation $ 1,084 1,084 745
Leasehold improvements [member]      
Loss before income tax includes the following specific      
Depreciation   192 52
Impairment of property, plant and equipment   143  
Plant and equipment [member]      
Loss before income tax includes the following specific      
Depreciation   $ 19 $ 47