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Share-based Compensation - Schedule of Stock Option Shares Activities (Detail) - Employee Stock Option [Member] - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options Outstanding, Beginning Balance 95,653,205 131,641,800 112,570,000  
Options, Granted 19,275,000 12,039,050 26,610,000  
Options, Canceled/Forfeited (6,490,415) (3,722,285) (7,538,200)  
Options,Expired   (300,000)    
Options,Exercised (53,873,360) (44,005,360)    
Options Outstanding, Ending Balance 54,564,430 95,653,205 131,641,800 112,570,000
Options Outstanding, Vested and expected to vest 53,286,128      
Outstanding, Weighted Average Exercise Price, Beginning balance $ 0.2214 $ 0.1108 $ 0.0650  
Options Outstanding, Exercisable 14,156,930      
Granted, Weighted Average Exercise Price $ 0.6540 0.8942 0.3020  
Canceled/Forfeited, Weighted Average Exercise Price 0.5964 0.1930 0.0967  
Expired, Weighted Average Exercise Price   0.0040    
Exercised, Weighted Average Exercise Price 0.0977 0.0543    
Outstanding, Weighted Average Exercise Price, Ending balance 0.4519 $ 0.2214 $ 0.1108 $ 0.0650
Vested and expected to vest, Weighted Average Exercise Price 0.4523      
Exercisable, Weighted Average Exercise Price $ 0.3075      
Outstanding, Weighted Average Remaining Contractual Life 2 years 6 months 3 days 2 years 2 months 1 day 2 years 8 months 8 days 3 years 4 months 13 days
Vested and expected to vest, Weighted Average Remaining Contractual Life 2 years 6 months 3 days      
Exercisable, Weighted Average Remaining Contractual Life 1 year 6 months 14 days      
Outstanding, Aggregate Intrinsic Value $ 4,264 $ 47,689 $ 172,618 $ 22,688
Vested and expected to vest, Aggregate Intrinsic Value 4,143      
Exercisable, Aggregate Intrinsic Value $ 3,221