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Share-based payments - Summary of share-based payments (Detail)
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2021
$ / shares
Jun. 30, 2021
Jun. 30, 2021
AUD ($)
Jun. 30, 2021
shares
Jun. 30, 2020
AUD ($)
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Balance at the start of the year, share options     2,775,167     2,660,766
Granted, share options     2,200,000   2,200,000 250,000
Exercised and modified     (441,500)     450,000
Expired /lapsed on termination of employment     (314,667)     (585,599)
Balance at the end of the year, share options     4,219,000     2,775,167
Balance at the start of the year, Weighted average exercise price   $ 0.797       $ 1.960
Granted, Weighted average exercise price   1.090       $ 0.880
Modified, Weighted average exercise price | $       $ 0.620   $ 2.348
Expired, Weighted average exercise price   1.850       $ 3.716
Balance at the end of the year, Weighted average exercise price   0.826       $ 0.797
Tranche 1 [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Grant date           04/03/2015
Expiry date           Dec. 16, 2019
Exercise price           $ 1.500
Balance at the start of the year, share options           46,647
Expired /lapsed on termination of employment           (46,647)
Tranche 2 [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Grant date           04/03/2015
Expiry date           Dec. 18, 2019
Exercise price           $ 1.500
Balance at the start of the year, share options           19,952
Expired /lapsed on termination of employment           (19,952)
Tranche 3 [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Grant date           24/06/2015
Expiry date           Jun. 30, 2020
Exercise price           $ 4.000
Balance at the start of the year, share options           519,000
Expired /lapsed on termination of employment           (519,000)
Tranche 4 [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Grant date 16/11/2015         16/11/2015
Expiry date Nov. 16, 2020         Nov. 16, 2020
Exercise price   2.200       $ 2.200
Balance at the start of the year, share options     236,667     236,667
Expired /lapsed on termination of employment     (236,667)      
Balance at the end of the year, share options           236,667
Tranche 5 [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Grant date           18/03/2016
Expiry date           Feb. 01, 2021
Exercise price           $ 1.990
Balance at the start of the year, share options           300,000
Exercised and modified           (300,000)
Tranche 6 [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Grant date           18/03/2016
Expiry date           Feb. 01, 2021
Exercise price           $ 1.990
Balance at the start of the year, share options           200,000
Exercised and modified           (200,000)
Tranche 7 [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Grant date           18/03/2016
Expiry date           Feb. 01, 2021
Exercise price           $ 2.610
Balance at the start of the year, share options           250,000
Exercised and modified           (250,000)
Tranche 8 [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Grant date 05/09/2016         05/09/2016
Expiry date Sep. 05, 2021         Sep. 05, 2021
Exercise price   1.630       $ 1.630
Balance at the start of the year, share options     50,000     50,000
Balance at the end of the year, share options           50,000
Tranche 9 [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Grant date 12/10/2016         12/10/2016
Expiry date Oct. 17, 2021         Oct. 17, 2021
Exercise price   1.560       $ 1.560
Balance at the start of the year, share options     62,000     62,000
Balance at the end of the year, share options           62,000
Tranche 10 [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Grant date 31/10/2016         31/10/2016
Expiry date Nov. 01, 2021         Nov. 01, 2021
Exercise price   1.380       $ 1.380
Balance at the start of the year, share options     12,500     12,500
Balance at the end of the year, share options     12,500     12,500
Tranche 11 [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Grant date 21/11/2016         21/11/2016
Expiry date Nov. 23, 2021         Nov. 23, 2021
Exercise price   1.380       $ 1.380
Balance at the start of the year, share options     50,000     50,000
Balance at the end of the year, share options           50,000
Tranche 12 [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Grant date 07/08/2017         07/08/2017
Expiry date Aug. 07, 2022         Aug. 07, 2022
Exercise price   0.670       $ 0.670
Balance at the start of the year, share options     224,000     224,000
Exercised and modified     (121,500)      
Expired /lapsed on termination of employment     (15,500)      
Balance at the end of the year, share options     87,000     224,000
Tranche 13 [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Grant date 05/02/2018         05/02/2018
Expiry date Feb. 05, 2023         Feb. 05, 2023
Exercise price   0.780       $ 0.780
Balance at the start of the year, share options     440,000     440,000
Exercised and modified     (120,000)      
Balance at the end of the year, share options     320,000     440,000
Tranche 14 [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Grant date 04/01/2019         04/01/2019
Expiry date Jan. 04, 2024         Jan. 04, 2024
Exercise price   0.492       $ 0.492
Balance at the start of the year, share options     250,000     250,000
Exercised and modified     (200,000)      
Expired /lapsed on termination of employment     (12,500)      
Balance at the end of the year, share options     37,500     250,000
Tranche 15 [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Grant date 13/11/2019         13/11/2019
Expiry date Jan. 04, 2024         Jan. 04, 2024
Exercise price   0.492       $ 0.492
Balance at the start of the year, share options     1,200,000      
Exercised and modified           1,200,000
Balance at the end of the year, share options     1,200,000     1,200,000
Tranche 16 [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Grant date 13/01/2020         13/01/2020
Expiry date Jan. 13, 2025         Jan. 13, 2025
Exercise price   0.881       $ 0.881
Balance at the start of the year, share options     250,000      
Granted, share options           250,000
Expired /lapsed on termination of employment     (50,000)      
Balance at the end of the year, share options     200,000     250,000
Tranche 17 [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Grant date 09/11/2020          
Expiry date Jan. 13, 2025          
Exercise price   1.132        
Granted, share options     1,200,000      
Balance at the end of the year, share options     1,200,000      
Tranche 18 [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Grant date 09/11/2020          
Expiry date Jan. 13, 2025          
Exercise price   0.881        
Granted, share options     800,000      
Balance at the end of the year, share options     800,000      
Tranche 19 [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Grant date 04/01/2021          
Expiry date Jan. 04, 2025          
Exercise price   $ 1.690        
Granted, share options     200,000      
Balance at the end of the year, share options     200,000