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Share-based Payments - Summary of the activity for the restricted shares issued under the Share Award Scheme (Detail) - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average grant date fair value - Granted $ 2.04 $ 0.78 $ 0.74
2013 Share Award Scheme [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares - Outstanding 53,602,560    
Number of shares - Granted 29,076,828    
Number of shares - Vested (19,020,640)    
Number of shares - Forfeited (5,671,482)    
Number of shares - Outstanding 57,987,266 53,602,560  
Number of shares - Expected to vest 57,987,266    
Weighted-average grant date fair value - Outstanding $ 0.76    
Weighted-average grant date fair value - Granted 2.04    
Weighted-average grant date fair value - Vested 0.71    
Weighted-average grant date fair value - Forfeited 1.61    
Weighted-average grant date fair value - Outstanding 1.32 $ 0.76  
Weighted-average grant date fair value - Expected to vest $ 1.32