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Loss Per Share - Schedule of Anti-Dilutive Potential Common Equivalent Shares Excluded from Calculation of Net (Loss) Income Per Share (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Denominator:      
Anti-dilutive potential common equivalent shares excluded from calculation of net loss per ordinary share 13,923 11,659 11,486
Stock options      
Denominator:      
Anti-dilutive potential common equivalent shares excluded from calculation of net loss per ordinary share 11,331 9,540 10,166
Restricted stock units      
Denominator:      
Anti-dilutive potential common equivalent shares excluded from calculation of net loss per ordinary share 2,592 2,119 1,320