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Income tax benefit - Summary of Income tax benefit (Detail) - AUD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Numerical reconciliation of income tax benefit and tax at the statutory rate      
Loss before income tax benefit $ (10,568) $ (6,344) $ (10,869)
Tax at the statutory tax rate of 27.5% (2,906) (1,745) (2,989)
Tax effect amounts which are not deductible/(taxable) in calculating taxable income:      
Impact of foreign tax rate differential 0 0 0
Research and Development claim 394 605 1,282
Capitalised expenses     234
Employee option plan 68 45 131
Gain/loss on revaluation of contingent consideration 17 (402) 210
Other non-deductible expenses     5
Tax effect amounts which are not deductible/(taxable) in calculating taxable income (2,428) (1,496) (1,127)
Prior year tax losses not recognised now recouped     (1)
Tax losses and timing differences not recognised 2,130 1,191 930
Income tax benefit (298) (305) (199)
Australia [member]      
Tax losses not recognised      
Unused tax losses for which no deferred tax asset has been recognised 57,050 50,331 49,131
Potential tax benefit 15,689 13,841 13,513
US [member]      
Tax losses not recognised      
Unused tax losses for which no deferred tax asset has been recognised 2,366 2,525 2,173
Potential tax benefit $ 497 $ 530 $ 456