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Income tax benefit - Summary of Income tax benefit (Detail) - AUD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Numerical reconciliation of income tax benefit and tax at the statutory rate      
Loss before income tax benefit $ (6,344) $ (10,869) $ (12,155)
Tax at the statutory tax rate of 27.5% (2017: 27.5%, 2016: 30%) (1,745) (2,989) (3,646)
Tax effect amounts which are not deductible/(taxable) in calculating taxable income:      
Impact of foreign tax rate differential     44
Research and Development claim 605 1,282 1,479
Capitalised expenses   234 79
Employee option plan 46 131 112
Gain/loss on revaluation of contingent consideration (402) 210  
Other non-deductible expenses   5 (317)
Tax effect amounts which are not deductible/(taxable) in calculating taxable income (1,496) (1,127) (2,249)
Prior year tax losses not recognised now recouped   (1)  
Tax losses and timing differences not recognised 1,191 929 2,249
Income tax benefit (305) (199)  
Australia [member]      
Tax losses not recognised      
Unused tax losses for which no deferred tax asset has been recognised 50,331 49,131 59,909
Potential tax benefit 13,841 13,513 17,973
US [member]      
Tax losses not recognised      
Unused tax losses for which no deferred tax asset has been recognised 2,525 2,173 2,100
Potential tax benefit $ 530 $ 456 $ 714