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Subsequent events - Additional Information (Detail) - AUD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 16, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2018
Cash flows from (used in) financing activities [abstract] |  |  |  |
Proceeds from issue of shares |  | $ 12,139 | $ 3,816 |
Sale Of Stock Through Underwriting Process [member] | GBM Agile Study [member] |  |  |  |
Cash flows from (used in) financing activities [abstract] |  |  |  |
Proceeds from issue of shares | $ 24,000 |  |  |

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