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Equity - contributed equity - Summary of movements in ordinary share capital (Detail) - AUD ($) | Nov. 17, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Nov. 30, 2016 | Nov. 01, 2016 | Oct. 31, 2016 | Sep. 14, 2016 | Sep. 05, 2016 | Jun. 30, 2018 | Jul. 01, 2016
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Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Shares | (434,958,293) | 483,287,914 |  | 80,000 |  |  | 20,000,000 | 400,000 | 48,409,621 | 429,733,982
Issue price | $ 0.000 |  | $ 0.000 | $ 0.370 |  |  |  | $ 0.105 |  |
Contributed equity |  | $ 193,769,000 | $ (162,223,185) | $ 29,600 |  |  |  | $ 42,000 | $ 31,576,000 | $ 191,301,217
Acquisition of Glioblast Pty Ltd [member] |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Shares |  |  |  |  |  | 17,153,932 |  |  |  |
Issue price |  |  |  |  |  | $ 0.090 |  |  |  |
Contributed equity |  |  |  |  |  | $ 1,543,854 |  |  |  |
Convertible note conversion [member] |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Shares |  |  |  |  | 16,000,000 |  | 20,000,000 |  |  |
Issue price |  |  |  |  | $ 0.025 |  | $ 0.025 |  |  |
Contributed equity |  |  |  |  | $ 400,000 |  | $ 500,000 |  |  |
Share issue transaction costs [member] |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |
Issue price |  | $ 0.000 |  |  |  |  |  |  |  |
Contributed equity |  | $ (17,662) |  |  |  |  |  |  |  |

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