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Share-based payments - Summary of share-based payments (Detail)
 12 Months Ended
Jun. 30, 2019
AUD ($)
Jun. 30, 2018
AUD ($)
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Balance at the start of the year, share options 2,410,766 2,109,325
Granted, share options 250,000 664,000
Exercised, share options   (16,628,392)
Forfeited on cessation of employment, share options   (3,734,167)
Balance at the end of the year, share options 2,660,766 2,410,766
Balance at the start of the year, Weighted average exercise price $ 2.120 $ 0.244
Granted, Weighted average exercise price 0.490 0.740
Exercised, Weighted average exercise price 0.000 0.000
Forfeited on cessation of employment, Weighted average exercise price 0.000 2.140
Balance at the end of the year, Weighted average exercise price $ 1.960 $ 2.120
Tranche 1 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant date Mar. 04, 2015 Mar. 04, 2015
Expiry date Dec. 16, 2019 Dec. 16, 2019
Exercise price $ 1.500 $ 1.500
Balance at the start of the year, share options 46,647 466,470
Exercised, share options   (419,823)
Balance at the end of the year, share options 46,647 46,647
Tranche 2 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant date Mar. 04, 2015 Mar. 04, 2015
Expiry date Dec. 18, 2019 Dec. 18, 2019
Exercise price $ 1.500 $ 1.500
Balance at the start of the year, share options 19,952 199,521
Exercised, share options   (179,569)
Balance at the end of the year, share options 19,952 19,952
Tranche 3 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant date Jun. 24, 2015 Jun. 24, 2015
Expiry date Jun. 30, 2020 Jun. 30, 2020
Exercise price $ 4.000 $ 4.000
Balance at the start of the year, share options 519,000 5,190,000
Exercised, share options   (4,671,000)
Balance at the end of the year, share options 519,000 519,000
Tranche 4 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant date Nov. 15, 2015 Nov. 15, 2015
Expiry date Nov. 16, 2020 Nov. 16, 2020
Exercise price $ 2.200 $ 2.200
Balance at the start of the year, share options 236,667 3,633,334
Forfeited on cessation of employment, share options   (3,396,667)
Balance at the end of the year, share options 236,667 236,667
Tranche 5 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant date Mar. 18, 2016 Mar. 18, 2016
Expiry date Feb. 01, 2021 Feb. 01, 2021
Exercise price $ 1.990 $ 1.990
Balance at the start of the year, share options 300,000 3,000,000
Exercised, share options   (2,700,000)
Balance at the end of the year, share options 300,000 300,000
Tranche 6 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant date Mar. 18, 2016 Mar. 18, 2016
Expiry date Feb. 01, 2021 Feb. 01, 2021
Exercise price $ 1.990 $ 1.990
Balance at the start of the year, share options 200,000 2,000,000
Exercised, share options   (1,800,000)
Balance at the end of the year, share options 200,000 200,000
Tranche 7 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant date Mar. 18, 2016 Mar. 18, 2016
Expiry date Feb. 01, 2021 Feb. 01, 2021
Exercise price $ 2.610 $ 2.610
Balance at the start of the year, share options 250,000 2,500,000
Exercised, share options   (2,250,000)
Balance at the end of the year, share options 250,000 250,000
Tranche 8 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant date Sep. 05, 2016 Sep. 05, 2016
Expiry date Sep. 05, 2021 Sep. 05, 2021
Exercise price $ 1.630 $ 1.630
Balance at the start of the year, share options 50,000 2,000,000
Exercised, share options   (1,800,000)
Forfeited on cessation of employment, share options   (150,000)
Balance at the end of the year, share options 50,000 50,000
Tranche 9 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant date Oct. 12, 2016 Oct. 12, 2016
Expiry date Oct. 17, 2021 Oct. 17, 2021
Exercise price $ 1.560 $ 1.560
Balance at the start of the year, share options 62,000 620,000
Exercised, share options   (558,000)
Balance at the end of the year, share options 62,000 62,000
Tranche 10 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant date Oct. 31, 2016 Oct. 31, 2016
Expiry date Nov. 01, 2021 Nov. 01, 2021
Exercise price $ 1.380 $ 1.380
Balance at the start of the year, share options 12,500 500,000
Exercised, share options   (450,000)
Forfeited on cessation of employment, share options   (37,500)
Balance at the end of the year, share options 12,500 12,500
Tranche 11 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant date Nov. 21, 2016 Nov. 21, 2016
Expiry date Nov. 23, 2021 Nov. 23, 2021
Exercise price $ 1.380 $ 1.380
Balance at the start of the year, share options 50,000 2,000,000
Exercised, share options   (1,800,000)
Forfeited on cessation of employment, share options   (150,000)
Balance at the end of the year, share options 50,000 50,000
Tranche 12 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant date Aug. 07, 2017 Aug. 07, 2017
Expiry date Aug. 07, 2022 Aug. 07, 2022
Exercise price $ 0.670 $ 0.670
Balance at the start of the year, share options 224,000  
Granted, share options   224,000
Balance at the end of the year, share options 224,000 224,000
Tranche 13 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant date Feb. 05, 2018 Feb. 05, 2018
Expiry date Feb. 05, 2023 Feb. 05, 2023
Exercise price $ 0.780 $ 0.780
Balance at the start of the year, share options 440,000  
Granted, share options   440,000
Balance at the end of the year, share options 440,000 440,000
Tranche 14 [member]    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Grant date Jan. 04, 2019  
Expiry date Jan. 04, 2024  
Exercise price $ 0.492  
Granted, share options 250,000  
Balance at the end of the year, share options 250,000