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Equity - contributed equity - Summary of movements in ordinary share capital (Detail) - AUD ($) |  |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | May 11, 2020 | Apr. 16, 2020 | Nov. 01, 2019 | Jun. 30, 2019 | Nov. 23, 2018 | Nov. 09, 2018 | Oct. 24, 2018 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  |  |  |  |  |  | $ 14,195,000 | $ 19,242,000 | $ 25,338,000
Issue of shares |  |  |  |  |  |  |  |  | 12,972,000 | 5,406,000 | 30,000
Ending balance | $ 14,125,000 |  |  |  | $ 14,195,000 |  |  |  | $ 14,125,000 | $ 14,195,000 | $ 19,242,000
Acquisition of Glioblast Pty Ltd [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Issue price |  |  |  |  |  |  | $ 0.440 |  |  |  |
Contributed equity [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  |  |  |  |  |  | 62,166,673 | 48,409,621 |
Ending Balance | 94,598,369 |  |  |  | 62,166,673 |  |  |  | 94,598,369 | 62,166,673 | 48,409,621
Beginning Balance |  |  |  |  |  |  |  |  | $ 36,642,000 | $ 31,576,000 | $ 193,769,000
Issue of shares |  |  |  |  |  |  |  |  | 12,972,000 | 5,406,000 | 30,000
Ending balance | $ 48,781,000 |  |  |  | $ 36,642,000 |  |  |  | $ 48,781,000 | $ 36,642,000 | $ 31,576,000
Contributed equity [member] | Acquisition of Glioblast Pty Ltd [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in shares outstanding |  |  |  |  |  |  |  |  |  | 2,820,824 |
Issue of shares |  |  |  |  |  |  |  |  |  | $ 1,250,000 |
Share Placement [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Issue price |  |  | $ 0.400 | $ 0.400 |  |  |  | $ 0.380 |  |  |
Share Placement [member] | Contributed equity [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in shares outstanding |  |  |  |  |  |  |  |  |  | 8,900,001 |
Issue of shares |  |  |  |  |  |  |  |  |  | $ 3,382,000 |
Share Placement [member] | Contributed equity [member] | 1 November 2019 [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Beginning Balance |  |  |  |  |  |  |  |  | 10,000,000 |  |
Ending Balance |  |  |  |  | 10,000,000 |  |  |  |  | 10,000,000 |
Beginning Balance |  |  |  |  |  |  |  |  | $ 4,000,000 |  |
Ending balance |  |  |  |  | $ 4,000,000 |  |  |  |  | $ 4,000,000 |
Share Placement [member] | Contributed equity [member] | 16 April 2020 [Member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in shares outstanding |  |  |  |  |  |  |  |  | 18,041,667 |  |
Issue of shares |  |  |  |  |  |  |  |  | $ 7,216,667 |  |
Share purchase plan [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Issue price |  | $ 0.400 |  |  |  | $ 0.380 |  |  |  |  |
Share purchase plan [member] | Contributed equity [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in shares outstanding |  |  |  |  |  |  |  |  | 4,390,010 | 2,036,227 |
Issue of shares |  |  |  |  |  |  |  |  | $ 1,756,004 | $ 773,760 |
Share issue transaction costs [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Issue price | $ 0.000 |  |  |  | $ 0.000 |  |  |  |  |  |
Share issue transaction costs [member] | Contributed equity [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in shares outstanding |  |  |  |  |  |  |  |  | 0 |  |
Issue of shares |  |  |  |  |  |  |  |  | $ (833,052) | $ (340,065) |
Conversion of options [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Issue price | $ 4.000 |  |  |  |  |  |  |  |  |  |
Conversion of options [member] | Contributed equity [member] |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in shares outstanding |  |  |  |  |  |  |  |  | 19 |  |
Issue of shares |  |  |  |  |  |  |  |  | $ 76 |  |

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