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Events after the reporting period - Additional Information (Detail) - AUD ($) | Oct. 31, 2018 | Jul. 31, 2018
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Anti tropomyosin program [member] | TroBio Therapeutics Proprietary Limited [Member] |  |
Disclosure of non-adjusting events after reporting period [line items] |  |
Equity interest, percentage |  | 12.00%
Subsequent Event [Member] | Share purchase plan [Member] |  |
Disclosure of non-adjusting events after reporting period [line items] |  |
Share placement amount | $ 3,400,000 |
Share purchase plan maturity date | Nov. 16, 2018 |
Subsequent Event [Member] | Share purchase plan [Member] | Top of range [member] |  |
Disclosure of non-adjusting events after reporting period [line items] |  |
Share placement eligibility ownership capacity amount | $ 15,000 |

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