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Fair value measurement - Additional Information (Detail)
12 Months Ended
Jun. 30, 2019
AUD ($)
Disclosure of fair value measurement of assets [line items]  
Transfers between Level 1 and Level 2 $ 0
Transfers between Level 2 and Level 1 0
Transfers into Level 3 0
Transfers out of Level 3 $ 0
Milestone payment discount rate 35.00%
Bottom of range [member]  
Disclosure of fair value measurement of assets [line items]  
Milestone payment discount rate 35.00%
Top of range [member]  
Disclosure of fair value measurement of assets [line items]  
Milestone payment discount rate 55.00%