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Share-based payments - Summary of share-based payments (Detail) | 12 Months Ended
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Jun. 30, 2020 AUD ($) $ / shares | Jun. 30, 2019 AUD ($) Major_Customer $ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Balance at the start of the year, share options | 2,660,766 | 2,410,766
Granted, share options | 250,000 | 250,000
Modified, share options | 450,000 |
Expired, share options | (585,599) |
Balance at the end of the year, share options | 2,775,167 | 2,660,766
Balance at the start of the year, Weighted average exercise price | $ 1.960 | $ 2.120
Granted, Weighted average exercise price | $ 0.880 | 0.490
Modified, Weighted average exercise price | $ | $ 2.348 |
Expired, Weighted average exercise price | $ 3.716 |
Exercised, Weighted average exercise price |  | $ 0.000
Forfeited on cessation of employment, Weighted average exercise price | $ |  | $ 0.000
Balance at the end of the year, Weighted average exercise price | $ 0.797 | $ 1.960
Tranche 1 [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Grant date | Mar. 04, 2015 | Mar. 04, 2015
Expiry date | Dec. 16, 2019 | Dec. 16, 2019
Exercise price | $ 1.500 | $ 1.500
Balance at the start of the year, share options | 46,647 | 46,647
Expired, share options | (46,647) |
Balance at the end of the year, share options |  | 46,647
Tranche 2 [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Grant date | Mar. 04, 2015 | Mar. 04, 2015
Expiry date | Dec. 18, 2019 | Dec. 18, 2019
Exercise price | $ 1.500 | $ 1.500
Balance at the start of the year, share options | 19,952 | 19,952
Expired, share options | (19,952) |
Balance at the end of the year, share options |  | 19,952
Tranche 3 [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Grant date | Jun. 24, 2015 | Jun. 24, 2015
Expiry date | Jun. 30, 2020 | Jun. 30, 2020
Exercise price | $ 4.000 | $ 4.000
Balance at the start of the year, share options | 519,000 | 519,000
Expired, share options | (519,000) |
Balance at the end of the year, share options |  | 519,000
Tranche 4 [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Grant date | Nov. 16, 2015 | Nov. 16, 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
Balance at the end of the year, share options | 236,667 | 236,667
Tranche 5 [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Grant date | Mar. 18, 2016 | Mar. 18, 2016
Expiry date | Feb. 01, 2021 | Feb. 01, 2021
Exercise price | $ 1.990 | $ 1.990
Balance at the start of the year, share options | 300,000 | 300,000
Modified, share options | (300,000) |
Balance at the end of the year, share options |  | 300,000
Tranche 6 [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Grant date | Mar. 18, 2016 | Mar. 18, 2016
Expiry date | Feb. 01, 2021 | Feb. 01, 2021
Exercise price | $ 1.990 | $ 1.990
Balance at the start of the year, share options | 200,000 | 200,000
Modified, share options | (200,000) |
Balance at the end of the year, share options |  | 200,000
Tranche 7 [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Grant date | Mar. 18, 2016 | Mar. 18, 2016
Expiry date | Feb. 01, 2021 | Feb. 01, 2021
Exercise price | $ 2.610 | $ 2.610
Balance at the start of the year, share options | 250,000 | 250,000
Modified, share options | (250,000) |
Balance at the end of the year, share options |  | 250,000
Tranche 8 [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Grant date | Sep. 05, 2016 | Sep. 05, 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 | 50,000
Tranche 9 [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Grant date | Oct. 12, 2016 | Oct. 12, 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 | 62,000
Tranche 10 [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Grant date | Oct. 31, 2016 | Oct. 31, 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 | Nov. 21, 2016 | Nov. 21, 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 | 50,000
Tranche 12 [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Grant date | Aug. 07, 2017 | Aug. 07, 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
Balance at the end of the year, share options | 224,000 | 224,000
Tranche 13 [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Grant date | Feb. 05, 2018 | Feb. 05, 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
Balance at the end of the year, share options | 440,000 | 440,000
Tranche 14 [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Grant date | Jan. 04, 2019 | Jan. 04, 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 |
Granted, share options |  | 250,000
Balance at the end of the year, share options | 250,000 | 250,000
Tranche 15 [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Grant date | Nov. 13, 2019 |
Expiry date | Jan. 04, 2024 |
Exercise price | $ 0.492 |
Modified, share options | 1,200,000 |
Balance at the end of the year, share options | 1,200,000 |
Tranche 16 [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Grant date | Jan. 13, 2020 |
Expiry date | Jan. 13, 2025 |
Exercise price | $ 0.881 |
Granted, share options | 250,000 |
Balance at the end of the year, share options | 250,000 |

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