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Business combinations - Summary of details of acquisition (Detail) - Glioblast Pty Ltd [member] - AUD ($)
Jun. 30, 2018
Jun. 30, 2017
Oct. 31, 2016
Disclosure of detailed information about business combination [line items]      
Intellectual property   $ 16,408,000 $ 16,408,000
Deferred tax liability   (4,512,000) (4,512,000)
Net assets acquired     11,896,000
Goodwill $ 0   0
Acquisition-date fair value of the total consideration transferred     11,896,000
Cash paid or payable to vendor   7,097,000 7,097,000
Less: shares issued by company as part of consideration   1,544,000 1,544,000
Contingent consideration   $ (3,255,000) 3,255,000
Total     $ 11,896,000