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Share-based payments - Summary of share-based payments (Detail) | 12 Months Ended
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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 |  |  |

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