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Income Per Share - Basic And Diluted Net Income Per Ordinary Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Numerator:        
Net (loss) income $ (119) $ 3,716 $ 4,071 $ 10,182
Denominator:        
Weighted average number of common shares - Basic 56,339 48,825 54,636 48,322
Effect of dilutive securities- share-based employee options and awards 0 1,887 1,120 1,837
Weighted average number of common shares - Diluted 56,339 50,712 55,756 50,159
Antidilutive options and awards 2,479 2,612 650 310
Net (loss) income per ordinary share:        
Basic income per share $ 0.00 $ 0.08 $ 0.07 $ 0.21
Diluted income per share $ 0.00 $ 0.07 $ 0.07 $ 0.20