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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, 2018
Sep. 30, 2017
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 3,912,336 3,805,795
RSUs [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Anti-dilutive shares excluded from calculation of diluted net loss per share 408,534 162,280
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