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Share-Based Compensation - Schedule of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Number of options        
Outstanding Beginning Balance 107,133,353 86,221,721 67,784,739  
Granted 32,710,153 26,509,592 25,679,294  
Exercised (54,385,484)      
Forfeited (2,982,054) (5,597,960) (7,242,312)  
Outstanding Ending Balance 82,475,968 107,133,353 86,221,721 67,784,739
Vested and expected to vest as of December 31, 2021 82,475,968      
Exercisable as of December 31, 2021 22,421,874      
Weighted average exercise price        
Outstanding Beginning Balance $ 1.16 $ 0.76 $ 0.50  
Granted 4.14 2.42 1.45  
Forfeited 1.98 1.00 0.84  
Exercised 0.55      
Outstanding Ending Balance 2.71 $ 1.16 $ 0.76 $ 0.50
Vested and expected to vest as of December 31, 2021 2.71      
Exercisable as of December 31, 2021 $ 1.27      
Weighted average remaining contractual life        
Outstanding Ending 8 years 18 days 6 years 10 months 2 days 7 years 2 months 19 days 7 years 7 months 20 days
Vested and expected to vest as of December 31, 2021 8 years 18 days      
Exercisable as of December 31, 2021 6 years 8 months 12 days      
Aggregate intrinsic value        
Outstanding Ending Balance $ 1,214,916 $ 226,639 $ 65,994 $ 22,714
Vested and expected to vest as of December 31, 2021 1,214,916      
Exercisable as of December 31, 2021 $ 362,469      
Weighted average grant–date fair value        
Outstanding Ending Balance $ 2.82 $ 0.64 $ 0.27 $ 0.12
Vested and expected to vest as of December 31, 2021 2.82      
Exercisable as of December 31, 2021 $ 0.86