Net Loss Per Share - Summary of Number of Ordinary Shares Excluded from Computation of Earnings Per Share (Detail) (Parenthetical) - $ / shares	Jun. 30, 2016	Jun. 30, 2015
Exercise Of Warrants At $16.14 Per Share
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Exercise of warrants per share	$ 16.14
Exercise Of Warrants At $9.37 Per Share
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Exercise of warrants per share	9.37	$ 9.37
Exercise Of Warrants At $8.80 Per Share
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Exercise of warrants per share		8.80
Exercise Of Pre-Funded Warrants At $0.01 Per Share
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Exercise of warrants per share	$ 0.01	$ 0.01