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Net Loss Per Ordinary Share - Anti-Dilutive Shares Excluded from Calculation of Diluted Net Loss Per Ordinary Share (Detail) - shares
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Series A Preferred Shares [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive shares excluded from calculation of diluted net loss per share 3,901,348 3,901,348
Employee Stock Option [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive shares excluded from calculation of diluted net loss per share 3,805,795 3,509,242
Restricted Share Units [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive shares excluded from calculation of diluted net loss per share 162,280 22,750