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Settlement of legal proceedings - Additional Information (Detail) |  | 12 Months Ended
--- | --- | ---
Jun. 14, 2018 AUD ($) shares | Jun. 30, 2018 AUD ($) $ / shares | Jun. 30, 2018 USD ($) | Jun. 30, 2017 AUD ($) | Jun. 30, 2016 AUD ($)
Disclosure of Legal Proceedings [line items] |  |  |  |  |
Extinguishment of convertible notes |  | $ 136,000 |  |  |
Cash payments |  | 0 |  | $ 0 |
Other income |  | 12,989,000 |  | $ 8,563,000 | $ 3,665,000
Noxopharm Limited [member] |  |  |  |  |
Disclosure of Legal Proceedings [line items] |  |  |  |  |
Shares held in escrow | shares | 5,970,714 |  |  |  |
Settlement of legal proceedings | $ 6,490,680 | $ 1,770,000 |  |  |
Number of unlisted options |  | 3,000,000 |  |  |
Excise price of unlisted options | $ / shares |  | $ 0.80 |  |  |
Cash payments |  | $ 165,000 |  |  |
Other income |  |  | $ 8,410,680 |  |
Change in equity |  |  | $ 136,000 |  |

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