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Share-based payments - Summary of valuation for each tranche of options (Detail) | 3 Months Ended | 12 Months Ended
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Jun. 30, 2017 AUD ($) | Jun. 30, 2018 AUD ($) | Jun. 30, 2017 AUD ($) yr $ / shares
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
Share price at Grant Date | $ / shares |  |  | $ 0.180
Exercise price | $ 0.150 | $ 1.50 | $ 1.500
Volatility (%) |  |  | 120.00%
Remaining Option Life | yr |  |  | 2.46
Risk free Rate |  |  | 2.07%
Fair value per option | $ 1.500 |  | $ 1.500
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
Share price at Grant Date | $ / shares |  |  | $ 0.180
Exercise price | $ 0.150 | $ 1.50 | $ 1.500
Volatility (%) |  |  | 120.00%
Remaining Option Life | yr |  |  | 2.47
Risk free Rate |  |  | 2.07%
Fair value per option | $ 1.500 |  | $ 1.500
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
Share price at Grant Date | $ / shares |  |  | $ 0.245
Exercise price | $ 0.400 | $ 4.00 | $ 4.000
Volatility (%) |  |  | 150.00%
Remaining Option Life | yr |  |  | 3.00
Risk free Rate |  |  | 2.02%
Fair value per option | $ 2.170 |  | $ 2.170
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
Share price at Grant Date | $ / shares |  |  | $ 0.140
Exercise price | $ 0.220 | $ 2.20 | $ 2.200
Volatility (%) |  |  | 158.11%
Remaining Option Life | yr |  |  | 3.38
Risk free Rate |  |  | 2.04%
Fair value per option | $ 1.280 |  | $ 1.280
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
Share price at Grant Date | $ / shares |  |  | $ 0.115
Exercise price | $ 0.199 | $ 1.99 | $ 1.990
Volatility (%) |  |  | 130.00%
Remaining Option Life | yr |  |  | 3.59
Risk free Rate |  |  | 2.00%
Fair value per option | $ 0.810 |  | $ 0.810
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
Share price at Grant Date | $ / shares |  |  | $ 0.115
Exercise price | $ 0.199 | $ 1.99 | $ 1.990
Volatility (%) |  |  | 130.00%
Remaining Option Life | yr |  |  | 3.59
Risk free Rate |  |  | 2.00%
Fair value per option | $ 0.860 |  | $ 0.860
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
Share price at Grant Date | $ / shares |  |  | $ 0.115
Exercise price | $ 0.261 | $ 2.61 | $ 2.610
Volatility (%) |  |  | 130.00%
Remaining Option Life | yr |  |  | 3.59
Risk free Rate |  |  | 2.00%
Fair value per option | $ 0.870 |  | $ 0.870
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
Share price at Grant Date | $ / shares |  |  | $ 0.105
Exercise price | $ 0.163 | $ 1.63 | $ 1.630
Volatility (%) |  |  | 122.00%
Remaining Option Life | yr |  |  | 4.19
Risk free Rate |  |  | 1.60%
Fair value per option | $ 0.840 |  | $ 0.840
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
Share price at Grant Date | $ / shares |  |  | $ 0.098
Exercise price | $ 0.156 | $ 1.56 | $ 1.560
Volatility (%) |  |  | 122.00%
Remaining Option Life | yr |  |  | 4.30
Risk free Rate |  |  | 1.89%
Fair value per option | $ 0.780 |  | $ 0.780
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
Share price at Grant Date | $ / shares |  |  | $ 0.090
Exercise price | $ 0.138 | $ 1.38 | $ 1.380
Volatility (%) |  |  | 122.00%
Remaining Option Life | yr |  |  | 4.34
Risk free Rate |  |  | 1.87%
Fair value per option | $ 0.720 |  | $ 0.720
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
Share price at Grant Date | $ / shares |  |  | $ 0.092
Exercise price | $ 0.138 | $ 1.38 | $ 1.380
Volatility (%) |  |  | 122.00%
Remaining Option Life | yr |  |  | 4.40
Risk free Rate |  |  | 2.10%
Fair value per option | 0.730 |  | $ 0.730
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
Share price at Grant Date | $ / shares |  |  | $ 0.430
Exercise price |  | $ 0.67 | $ 0.670
Volatility (%) |  |  | 74.50%
Remaining Option Life | yr |  |  | 4.00
Risk free Rate |  |  | 1.95%
Fair value per option | 0.206 |  | $ 0.206
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
Share price at Grant Date | $ / shares |  |  | $ 0.500
Exercise price |  | $ 0.78 | $ 0.780
Volatility (%) |  |  | 74.50%
Remaining Option Life | yr |  |  | 3.00
Risk free Rate |  |  | 1.95%
Fair value per option | $ 0.200 |  | $ 0.200

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