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Loss Per Ordinary Share - Additional Information (Details) - shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Shares Issuable Upon Conversion of Preferred Shares      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Anti-dilutive securities excluded from calculation of diluted loss per share, Shares   5,193,427 5,193,427
Outstanding Options      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Anti-dilutive securities excluded from calculation of diluted loss per share, Shares 2,415,545 2,665,099 2,199,838
Preferred A-1 Warrants Converted to Ordinary Shares      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Anti-dilutive securities excluded from calculation of diluted loss per share, Shares   728,312 728,312