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Convertible Redeemable Preferred Shares - Summary of convertible redeemable preferred share (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
CNY (¥)
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
CNY (¥)
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
CNY (¥)
shares
Dec. 31, 2019
USD ($)
shares
Series A Redeemable Convertible Preferred Stock [Member]            
Temporary Equity [Line Items]            
Balance Beginning ¥ 36,177   ¥ 33,434   ¥ 30,144  
Balance Beginning, Shares | shares 60,000,000 60,000,000 60,000,000 60,000,000 60,000,000 60,000,000
Accretion on convertible redeemable preferred shares to redemption value ¥ 1,057   ¥ 2,743   ¥ 3,290  
Conversion of preferred shares to ordinary shares ¥ (37,234)          
Conversion of preferred shares to ordinary shares, Shares | shares (60,000,000) (60,000,000)        
Balance Ending, Shares | shares 0 0 60,000,000 60,000,000 60,000,000 60,000,000
Balance Ending ¥ 0   ¥ 36,177   ¥ 33,434  
Series B Redeemable Convertible Preferred Stock [Member]            
Temporary Equity [Line Items]            
Balance Beginning ¥ 67,976   ¥ 62,785   ¥ 56,554  
Balance Beginning, Shares | shares 40,000,000 40,000,000 40,000,000 40,000,000 40,000,000 40,000,000
Accretion on convertible redeemable preferred shares to redemption value ¥ 2,006   ¥ 5,191   ¥ 6,231  
Conversion of preferred shares to ordinary shares ¥ (69,982)          
Conversion of preferred shares to ordinary shares, Shares | shares (40,000,000) (40,000,000)        
Balance Ending, Shares | shares 0 0 40,000,000 40,000,000 40,000,000 40,000,000
Balance Ending ¥ 0   ¥ 67,976   ¥ 62,785  
Series C Redeemable Convertible Preferred Stock [Member]            
Temporary Equity [Line Items]            
Balance Beginning ¥ 478,565   ¥ 443,367   ¥ 400,950  
Balance Beginning, Shares | shares 147,068,133 147,068,133 147,068,133 147,068,133 147,068,133 147,068,133
Accretion on convertible redeemable preferred shares to redemption value ¥ 13,580   ¥ 35,198   ¥ 42,417  
Conversion of preferred shares to ordinary shares ¥ (492,145)          
Conversion of preferred shares to ordinary shares, Shares | shares (147,068,133) (147,068,133)        
Balance Ending, Shares | shares 0 0 147,068,133 147,068,133 147,068,133 147,068,133
Balance Ending ¥ 0   ¥ 478,565   ¥ 443,367  
Series D Redeemable Convertible Preferred Stock [Member]            
Temporary Equity [Line Items]            
Balance Beginning ¥ 380,782   ¥ 352,586   ¥ 317,533  
Balance Beginning, Shares | shares 60,856,049 60,856,049 60,856,049 60,856,049 60,856,049 60,856,049
Accretion on convertible redeemable preferred shares to redemption value ¥ 10,823   ¥ 28,196   ¥ 35,053  
Conversion of preferred shares to ordinary shares ¥ (391,605)          
Conversion of preferred shares to ordinary shares, Shares | shares (60,856,049) (60,856,049)        
Balance Ending, Shares | shares 0 0 60,856,049 60,856,049 60,856,049 60,856,049
Balance Ending ¥ 0   ¥ 380,782   ¥ 352,586  
Series E Redeemable Convertible Preferred Stock [Member]            
Temporary Equity [Line Items]            
Balance Beginning ¥ 1,845,033   ¥ 1,711,329   ¥ 874,107  
Balance Beginning, Shares | shares 144,073,367 144,073,367 144,073,367 144,073,367 83,474,263 83,474,263
Issuance of Series         ¥ 691,894  
Issuance of Series, Shares | shares         60,599,104 60,599,104
Accretion on convertible redeemable preferred shares to redemption value ¥ 51,072   ¥ 133,704   ¥ 145,328  
Conversion of preferred shares to ordinary shares ¥ (1,896,105)          
Conversion of preferred shares to ordinary shares, Shares | shares (144,073,367) (144,073,367)        
Balance Ending, Shares | shares 0 0 144,073,367 144,073,367 144,073,367 144,073,367
Balance Ending ¥ 0   ¥ 1,845,033   ¥ 1,711,329  
Series F Redeemable Convertible Preferred Stock [Member]            
Temporary Equity [Line Items]            
Balance Beginning ¥ 2,882,063          
Balance Beginning, Shares | shares 99,354,585 99,354,585        
Issuance of Series     ¥ 2,803,114      
Issuance of Series, Shares | shares     99,354,585 99,354,585    
Accretion on convertible redeemable preferred shares to redemption value ¥ 85,527   ¥ 78,949      
Conversion of preferred shares to ordinary shares ¥ (2,967,590)          
Conversion of preferred shares to ordinary shares, Shares | shares (99,354,585) (99,354,585)        
Balance Ending, Shares | shares 0 0 99,354,585 99,354,585    
Balance Ending ¥ 0   ¥ 2,882,063      
Redeemable Convertible Preferred Stock [Member]            
Temporary Equity [Line Items]            
Balance Beginning ¥ 5,690,596   ¥ 2,603,501   ¥ 1,679,288  
Balance Beginning, Shares | shares 551,352,134 551,352,134 451,997,549 451,997,549 391,398,445 391,398,445
Issuance of Series     ¥ 2,803,114   ¥ 691,894  
Issuance of Series, Shares | shares     99,354,585 99,354,585 60,599,104 60,599,104
Accretion on convertible redeemable preferred shares to redemption value ¥ 164,065 $ 25,284 ¥ 283,981 $ 41,546 ¥ 232,319 $ 33,529
Conversion of preferred shares to ordinary shares ¥ (5,854,661)          
Conversion of preferred shares to ordinary shares, Shares | shares (551,352,134) (551,352,134)        
Balance Ending, Shares | shares 0 0 551,352,134 551,352,134 451,997,549 451,997,549
Balance Ending ¥ 0   ¥ 5,690,596   ¥ 2,603,501