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Equity - contributed equity - Summary of movements in ordinary share capital (Detail) - AUD ($) |  |  |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Nov. 23, 2018 | Nov. 09, 2018 | Oct. 24, 2018 | Dec. 31, 2017 | Nov. 30, 2017 | Nov. 17, 2017 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Share issue transaction costs |  |  |  |  |  |  |  | $ (340,000) |  | $ (18,000)
Issue price |  |  |  |  | $ 0.000 | $ 0.370 | $ 0.000 |  |  |
Beginning Balance |  |  |  |  |  |  |  | 19,242,000 | $ 25,338,000 | 33,931,000
Issue of shares |  |  |  |  |  |  |  | 5,406,000 | 30,000 |
Ending balance | $ 14,195,000 |  |  |  |  |  |  | $ 14,195,000 | $ 19,242,000 | 25,338,000
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 |  |  |  |  |  |  |  | 48,409,621 | 483,287,914 |
Share issue transaction costs |  |  |  |  |  |  |  | $ (340,065) |  | $ (18,000)
Ending Balance | 62,166,673 |  |  |  |  |  |  | 62,166,673 | 48,409,621 | 483,287,914
Beginning Balance |  |  |  |  |  |  |  | $ 31,575,824 | $ 193,769,409 | $ 191,301,000
Share consolidation - note 1 |  |  |  |  |  |  |  |  | 0 |
Issue of shares |  |  |  |  |  |  |  | 5,406,000 | 29,600 |
Cancellation of share capital - note 2 |  |  |  |  |  |  |  |  | (162,223,185) |
Ending balance | $ 36,641,519 |  |  |  |  |  |  | $ 36,641,519 | $ 31,575,824 | $ 193,769,409
Contributed equity [member] | Share consolidation [member] |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Increase (decrease) in shares outstanding |  |  |  |  |  |  |  |  | (434,958,293) |
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 |  |  |  | $ 0.380 |  |  |  |  |  |
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 purchase plan [member] |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Issue price |  | $ 0.380 |  |  |  |  |  |  |  |
Share purchase plan [member] | Contributed equity [member] |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Increase (decrease) in shares outstanding |  |  |  |  |  |  |  | 2,036,227 |  |
Issue of shares |  |  |  |  |  |  |  | $ 773,760 |  |
Share issue transaction costs [member] |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Issue price | $ 0.000 |  |  |  |  |  |  |  |  |
Scientific Advisory Board [member] | Contributed equity [member] |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Increase (decrease) in shares outstanding |  |  |  |  |  |  |  |  | 80,000 |

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