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Income tax benefit - Summary of Income tax benefit (Detail) - AUD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Numerical reconciliation of income tax benefit and tax at the statutory rate      
Loss before income tax benefit $ (12,765) $ (10,568) $ (6,344)
Tax at the statutory tax rate of 27.5% (3,511) (2,906) (1,745)
Tax effect amounts which are not deductible/(taxable) in calculating taxable income:      
Impact of foreign tax rate differential
Research and Development claim 280 394 605
Capitalised expenses
Employee option plan 72 67 45
Gain/loss on revaluation of contingent consideration 131 17 (401)
Other non-deductible expenses
Tax effect amounts which are not deductible/(taxable) in calculating taxable income (3,028) (2,428) (1,496)
Prior year tax losses not recognised now recouped
Tax losses and timing differences not recognised 2,730 2,130 1,191
Income tax benefit (298) (298) (305)
Australia [member]      
Tax losses not recognised      
Unused tax losses for which no deferred tax asset has been recognised 67,430 57,050 50,331
Potential tax benefit 18,543 15,689 13,841
US [member]      
Tax losses not recognised      
Unused tax losses for which no deferred tax asset has been recognised 1,570 2,366 2,525
Potential tax benefit $ 330 $ 497 $ 530