Subsequent Events - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	Feb. 10, 2016	Dec. 31, 2015
Ordinary Shares [Member]
Subsequent Event [Line Items]
Underwritten public offering, per shares		$ 16.00
Subsequent Event
Subsequent Event [Line Items]
Number of days option granted to underwriters	30 days
Subsequent Event | Ordinary Shares [Member]
Subsequent Event [Line Items]
Underwritten equity offering	$ 36.9
Underwritten public offering, shares	4,444,445
Underwritten public offering, per shares	$ 9.00
Additional number of shares available for grant	666,666