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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Taxation      
Aggregate dollar effect $ (3,856) $ (3,776) $ (4,102)
Per share effect- - basic $ (0.01) $ (0.01) $ (0.01)
Per share effect- - diluted $ (0.01) $ (0.01) $ (0.01)