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Share-based payments - Summary of share-based payments (Detail)
 12 Months Ended
Jun. 30, 2022
$ / shares
Jun. 30, 2022
$ / shares
Jun. 30, 2022
$ / shares
Jun. 30, 2022
shares
$ / shares
Jun. 30, 2021
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Balance at the start of the year, share options   4,219,000     2,775,167
Granted, share options   4,800,000   4,800,000 2,200,000
Exercised, share options   (25,000)     (441,500)
Expired / lapsed on termination of employment   (338,500)     (314,667)
Balance at the end of the year, share options   8,655,500     4,219,000
Exercisable at the end of the financial year, share option 3,180,500 3,180,500 3,180,500 3,180,500 2,506,667
Balance at the start of the year, Weighted average exercise price     $ 0.8911   $ 0.797
Granted, Weighted average exercise price     1.611   1.0915
Exercised, Weighted average exercise price     0.67   0.6195
Expired, Weighted average exercise price     1.1123   1.8473
Balance at the end of the year, Weighted average exercise price     1.2826   0.8911
Exercisable at the end of the financial year, Weighted average exercise price $ 0.877 $ 0.877 0.877 $ 0.877 $ 0.6195
Tranche 1 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date         16/11/2015
Expiry date         Nov. 16, 2020
Exercise price         $ 2.2
Balance at the start of the year, share options         236,667
Expired / lapsed on termination of employment         (236,667)
Tranche 2 [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       May 09, 2021
Exercise price     1.63   $ 1.63
Balance at the start of the year, share options   50,000     50,000
Expired / lapsed on termination of employment   (50,000)      
Balance at the end of the year, share options         50,000
Tranche 3 [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     1.56   $ 1.56
Balance at the start of the year, share options   62,000     62,000
Expired / lapsed on termination of employment   (62,000)      
Balance at the end of the year, share options         62,000
Tranche 4 [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       Jan. 11, 2021
Exercise price     1.38   $ 1.38
Balance at the start of the year, share options   12,500     12,500
Expired / lapsed on termination of employment   (12,500)      
Balance at the end of the year, share options         12,500
Tranche 5 [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     1.38   $ 1.38
Balance at the start of the year, share options   50,000     50,000
Expired / lapsed on termination of employment   (50,000)      
Balance at the end of the year, share options         50,000
Tranche 6 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date 07/08/2017       07/08/2017
Expiry date Jul. 08, 2022       Jul. 08, 2022
Exercise price     0.67   $ 0.67
Balance at the start of the year, share options   87,000     224,000
Exercised, share options   (25,000)     (121,500)
Expired / lapsed on termination of employment   (46,500)     (15,500)
Balance at the end of the year, share options   15,500     87,000
Tranche 7 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date 05/02/2018       05/02/2018
Expiry date May 02, 2023       May 02, 2023
Exercise price     0.78   $ 0.78
Balance at the start of the year, share options   320,000     440,000
Exercised, share options         (120,000)
Expired / lapsed on termination of employment   (80,000)      
Balance at the end of the year, share options   240,000     320,000
Tranche 8 [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       Apr. 01, 2024
Exercise price     0.4925   $ 0.4925
Balance at the start of the year, share options   37,500     250,000
Exercised, share options         (200,000)
Expired / lapsed on termination of employment   (37,500)     (12,500)
Balance at the end of the year, share options         37,500
Tranche 9 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date 13/11/2019       13/11/2019
Expiry date Nov. 13, 2023       Nov. 13, 2023
Exercise price     0.4925   $ 0.4925
Balance at the start of the year, share options   1,200,000     1,200,000
Balance at the end of the year, share options   1,200,000     1,200,000
Tranche 10 [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     0.8812   $ 0.8812
Balance at the start of the year, share options   200,000     250,000
Expired / lapsed on termination of employment         (50,000)
Balance at the end of the year, share options   200,000     200,000
Tranche 11 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date 09/11/2020       09/11/2020
Expiry date Sep. 11, 2024       Sep. 11, 2024
Exercise price     1.132   $ 1.132
Balance at the start of the year, share options   1,200,000      
Granted, share options         1,200,000
Balance at the end of the year, share options   1,200,000     1,200,000
Tranche 12 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date 09/11/2020       09/11/2020
Expiry date Sep. 11, 2024       Sep. 11, 2024
Exercise price     0.8812   $ 0.8812
Balance at the start of the year, share options   800,000      
Granted, share options         800,000
Balance at the end of the year, share options   800,000     800,000
Tranche 13 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date 04/01/2021       04/01/2021
Expiry date Apr. 01, 2025       Apr. 01, 2025
Exercise price     1.69   $ 1.69
Balance at the start of the year, share options   200,000      
Granted, share options         200,000
Balance at the end of the year, share options   200,000     200,000
Tranche 14 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date 09/09/2021        
Expiry date Jun. 21, 2026        
Exercise price     1.37    
Granted, share options   100,000      
Balance at the end of the year, share options   100,000      
Tranche 15 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date 16/11/2021        
Expiry date Nov. 16, 2025        
Exercise price     1.69    
Granted, share options   1,000,000      
Balance at the end of the year, share options   1,000,000      
Tranche 16 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date 16/11/2021        
Expiry date Nov. 16, 2025        
Exercise price     2.24    
Granted, share options   1,500,000      
Balance at the end of the year, share options   1,500,000      
Tranche 17 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date 16/11/2021        
Expiry date Nov. 16, 2025        
Exercise price     1.56    
Granted, share options   800,000      
Balance at the end of the year, share options   800,000      
Tranche 18 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date 01/02/2022        
Expiry date Jan. 02, 2027        
Exercise price     0.94    
Granted, share options   500,000      
Balance at the end of the year, share options   500,000      
Tranche 19 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date 01/02/2022        
Expiry date Feb. 01, 2027        
Exercise price     0.94    
Granted, share options   800,000      
Balance at the end of the year, share options   800,000      
Tranche 20 [member]          
Disclosure of terms and conditions of share-based payment arrangement [line items]          
Grant date 24/05/2022        
Expiry date May 24, 2027        
Exercise price     $ 0.78    
Granted, share options   100,000      
Balance at the end of the year, share options   100,000