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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Taxation      
Aggregate dollar effect (In thousands) $ (197) $ (3,856) $ (3,776)
Per share effect-basic $ 0.00 $ (0.01) $ (0.01)
Per share effect-diluted $ 0.00 $ (0.01) $ (0.01)