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Taxation - Summary of Aggregate Amount and Per Share Effect of Tax Holiday (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Aggregate dollar effect $ (4,102) $ (1,430) $ (830)
Per share effect—basic $ (0.01) $ 0 $ 0
Per share effect—diluted $ (0.01) $ 0 $ 0