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Income (Loss) Per Share - Basic And Diluted Net Income (loss) Per Ordinary Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator:      
Net income (loss) $ 11,608 $ 2,325 $ (7,515)
Denominator:      
Weighted average number of common shares – Basic 58,526 49,418 44,357
Effect of dilutive securities – share-based employee options and awards 2,964 1,761  
Weighted average number of common shares – Diluted 61,490 51,179 44,357
Antidilutive options and awards [1] 500 310 2,175
Net income (loss) per ordinary share:      
Basic $ 0.20 $ 0.05 $ (0.17)
Diluted $ 0.19 $ 0.05 $ (0.17)
[1] Options to purchase shares of common stock and unvested RSUs are not included in the calculation of net income (loss) per share because the effect would have been anti-dilutive.