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Share-based payments - Summary of share-based payments (Detail) | 3 Months Ended | 12 Months Ended
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Jun. 30, 2017 AUD ($) | Jun. 30, 2018 AUD ($) shares | Jun. 30, 2017 AUD ($)
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Balance at the start of the year, share options | 18,555,999 | 22,109,325 |
Granted, share options | 5,120,000 | 664,000 |
Share Consolidation, share options | shares |  | (16,628,392) |
Exercised, share options | 0 |  |
Forfeited on cessation of employment, share options | (1,566,674) | (3,734,167) |
Balance at the end of the year, share options | 22,109,325 | 2,410,766 | 22,109,325
Balance at the start of the year, Weighted average exercise price |  | $ 0.244 | $ 0.2680
Granted, Weighted average exercise price |  | 0.740 | 0.1500
Exercised, Weighted average exercise price |  | 0.000 | 0.0000
Forfeited on cessation of employment, Weighted average exercise price |  | 2.140 | 0.2200
Balance at the end of the year, Weighted average exercise price | $ 0.244 | $ 2.120 | $ 0.244
Tranche 1 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Grant date | Mar. 04, 2015 | Mar. 04, 2015 | Mar. 04, 2015
Expiry date | Dec. 16, 2019 | Dec. 16, 2019 | Dec. 16, 2019
Exercise price | $ 0.150 | $ 1.50 | $ 1.500
Balance at the start of the year, share options | 466,470 | 466,470 |
Share Consolidation, share options | shares |  | (419,823) |
Exercised, share options | 0 |  |
Balance at the end of the year, share options | 466,470 | 46,647 | 466,470
Tranche 2 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Grant date | Mar. 04, 2015 | Mar. 04, 2015 | Mar. 04, 2015
Expiry date | Dec. 18, 2019 | Dec. 18, 2019 | Dec. 18, 2019
Exercise price | $ 0.150 | $ 1.50 | $ 1.500
Balance at the start of the year, share options | 199,521 | 199,521 |
Share Consolidation, share options | shares |  | (179,569) |
Exercised, share options | 0 |  |
Balance at the end of the year, share options | 199,521 | 199,521 | 199,521
Tranche 3 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Grant date | Jun. 24, 2015 | Jun. 24, 2015 | Jun. 24, 2015
Expiry date | Jun. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2020
Exercise price | $ 0.400 | $ 4.00 | $ 4.000
Balance at the start of the year, share options | 5,190,000 | 5,190,000 |
Share Consolidation, share options | shares |  | (4,671,000) |
Exercised, share options | 0 |  |
Balance at the end of the year, share options | 5,190,000 | 519,000 | 5,190,000
Tranche 4 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Grant date | Oct. 15, 2015 | Oct. 15, 2015 | Oct. 15, 2015
Expiry date | Nov. 16, 2020 | Nov. 16, 2020 | Nov. 16, 2020
Exercise price | $ 0.220 | $ 2.20 | $ 2.200
Balance at the start of the year, share options | 5,200,008 | 3,633,334 |
Exercised, share options | 0 |  |
Forfeited on cessation of employment, share options | (1,566,674) | (339,667) |
Balance at the end of the year, share options | 3,633,334 | 236,667 | 3,633,334
Tranche 5 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Grant date | Mar. 18, 2016 | Mar. 18, 2016 | Mar. 18, 2016
Expiry date | Feb. 01, 2021 | Feb. 01, 2021 | Feb. 01, 2021
Exercise price | $ 0.199 | $ 1.99 | $ 1.990
Balance at the start of the year, share options | 3,000,000 | 3,000,000 |
Share Consolidation, share options | shares |  | (2,700,000) |
Exercised, share options | 0 |  |
Balance at the end of the year, share options | 3,000,000 | 300,000 | 3,000,000
Tranche 6 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Grant date | Mar. 18, 2016 | Mar. 18, 2016 | Mar. 18, 2016
Expiry date | Feb. 01, 2021 | Feb. 01, 2021 | Feb. 01, 2021
Exercise price | $ 0.199 | $ 1.99 | $ 1.990
Balance at the start of the year, share options | 2,000,000 | 2,000,000 |
Share Consolidation, share options | shares |  | (1,800,000) |
Exercised, share options | 0 |  |
Balance at the end of the year, share options | 2,000,000 | 200,000 | 2,000,000
Tranche 7 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Grant date | Mar. 18, 2016 | Mar. 18, 2016 | Mar. 18, 2016
Expiry date | Feb. 01, 2021 | Feb. 01, 2021 | Feb. 01, 2021
Exercise price | $ 0.261 | $ 2.61 | $ 2.610
Balance at the start of the year, share options | 2,500,000 | 2,500,000 |
Share Consolidation, share options | shares |  | (2,250,000) |
Exercised, share options | 0 |  |
Balance at the end of the year, share options | 2,500,000 | 250,000 | 2,500,000
Tranche 8 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Grant date | Sep. 05, 2016 | Sep. 05, 2016 | Sep. 05, 2016
Expiry date | Sep. 05, 2021 | Sep. 05, 2021 | Sep. 05, 2021
Exercise price | $ 0.163 | $ 1.63 | $ 1.630
Balance at the start of the year, share options |  | 2,000,000 |
Granted, share options | 2,000,000 |  |
Share Consolidation, share options | shares |  | (1,800,000) |
Exercised, share options | 0 |  |
Forfeited on cessation of employment, share options |  | (150,000) |
Balance at the end of the year, share options | 2,000,000 | 50,000 | 2,000,000
Tranche 9 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Grant date | Oct. 12, 2016 | Oct. 12, 2016 | Oct. 12, 2016
Expiry date | Oct. 17, 2021 | Oct. 17, 2021 | Oct. 17, 2021
Exercise price | $ 0.156 | $ 1.56 | $ 1.560
Balance at the start of the year, share options |  | 620,000 |
Granted, share options | 620,000 | 224,000 |
Share Consolidation, share options | shares |  | (558,000) |
Exercised, share options | 0 |  |
Balance at the end of the year, share options | 620,000 | 62,000 | 620,000
Tranche 10 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Grant date | Oct. 31, 2016 | Oct. 31, 2016 | Oct. 31, 2016
Expiry date | Nov. 01, 2021 | Nov. 01, 2021 | Nov. 01, 2021
Exercise price | $ 0.138 | $ 1.38 | $ 1.380
Balance at the start of the year, share options |  | 500,000 |
Granted, share options | 500,000 | 440,000 |
Share Consolidation, share options | shares |  | (450,000) |
Exercised, share options | 0 |  |
Forfeited on cessation of employment, share options |  | (37,500) |
Balance at the end of the year, share options | 500,000 | 12,500 | 500,000
Tranche 11 [member] |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Grant date | Nov. 21, 2016 | Nov. 21, 2016 | Nov. 21, 2016
Expiry date | Nov. 23, 2021 | Nov. 23, 2021 | Nov. 23, 2021
Exercise price | $ 0.138 | $ 1.38 | $ 1.380
Balance at the start of the year, share options |  | 2,000,000 |
Granted, share options | 2,000,000 |  |
Share Consolidation, share options | shares |  | (1,800,000) |
Exercised, share options | 0 |  |
Forfeited on cessation of employment, share options |  | (150,000) |
Balance at the end of the year, share options | 2,000,000 | 50,000 | 2,000,000
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 |  | $ 0.67 | $ 0.670
Granted, share options |  | 224,000 |
Balance at the end of the year, share options |  | 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 |  | $ 0.78 | $ 0.780
Granted, share options |  | 440,000 |
Balance at the end of the year, share options |  | 440,000 |

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