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Key Management Personnel - Summary of Key Management Personnel (Detail) - USD ($)
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure of transactions between related parties [abstract]      
Short-term employee benefits $ 13,190,838 $ 16,439,948 $ 14,979,983
Post-employment benefits 1,506,108 1,895,828 2,356,594
Share-based payments 13,356,657 13,747,355 16,837,179
Total $ 28,053,603 $ 32,083,131 $ 34,173,756