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Convertible Redeemable Preferred Shares - Additional Information (Detail)
¥ in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
Nov. 27, 2020
USD ($)
shares
Feb. 10, 2020
USD ($)
shares
Jul. 04, 2019
USD ($)
shares
Mar. 08, 2019
USD ($)
shares
Dec. 18, 2018
USD ($)
shares
Nov. 02, 2017
USD ($)
shares
Feb. 10, 2017
USD ($)
shares
Aug. 15, 2016
USD ($)
shares
Jul. 07, 2016
USD ($)
shares
Apr. 08, 2015
USD ($)
shares
Dec. 16, 2014
USD ($)
shares
May 20, 2014
USD ($)
shares
Jun. 30, 2021
shares
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
Convertible Redeemable Preferred Shares [Line Items]                                      
Proceeds from Issuance of Redeemable Convertible Preferred Stock                           ¥ 0 $ 0 ¥ 2,803,114   ¥ 993,475  
Common Class A [Member]                                      
Convertible Redeemable Preferred Shares [Line Items]                                      
Conversion of preferred shares to ordinary shares, Shares | shares                         551,352,134 551,352,134 551,352,134        
Series A Redeemable Convertible Preferred Stock [Member]                                      
Convertible Redeemable Preferred Shares [Line Items]                                      
Accretion on convertible redeemable preferred shares to redemption value | ¥                           ¥ 1,057   2,743   3,290  
Series B Redeemable Convertible Preferred Stock [Member]                                      
Convertible Redeemable Preferred Shares [Line Items]                                      
Accretion on convertible redeemable preferred shares to redemption value | ¥                           2,006   5,191   ¥ 6,231  
Series B Redeemable Convertible Preferred Stock [Member] | TECHWOLF LIMITED [Member]                                      
Convertible Redeemable Preferred Shares [Line Items]                                      
Temporary equity issued during the period shares | shares                     13,333,333                
Temporary equity repurchased during the period | shares                   13,333,333                  
Series E Redeemable Convertible Preferred Stock [Member]                                      
Convertible Redeemable Preferred Shares [Line Items]                                      
Temporary equity issued during the period shares | shares                                   60,599,104 60,599,104
Accretion on convertible redeemable preferred shares to redemption value | ¥                           51,072   133,704   ¥ 145,328  
Series C Redeemable Convertible Preferred Stock [Member]                                      
Convertible Redeemable Preferred Shares [Line Items]                                      
Accretion on convertible redeemable preferred shares to redemption value | ¥                           13,580   35,198   42,417  
Series D Redeemable Convertible Preferred Stock [Member]                                      
Convertible Redeemable Preferred Shares [Line Items]                                      
Accretion on convertible redeemable preferred shares to redemption value | ¥                           10,823   ¥ 28,196   ¥ 35,053  
Series F Redeemable Convertible Preferred Stock [Member]                                      
Convertible Redeemable Preferred Shares [Line Items]                                      
Temporary equity issued during the period shares | shares                               99,354,585 99,354,585    
Accretion on convertible redeemable preferred shares to redemption value | ¥                           ¥ 85,527   ¥ 78,949      
Redeemable Convertible Preferred Stock [Member]                                      
Convertible Redeemable Preferred Shares [Line Items]                                      
Temporary equity issued during the period shares | shares                               99,354,585 99,354,585 60,599,104 60,599,104
Preferred Stock convertible, conversion ratio                           1 1        
Temporary equity liquidation preference per share percentage                           100.00% 100.00%        
Threshold shareholding percentage required for redemption notice                           50.00% 50.00%        
Accretion on convertible redeemable preferred shares to redemption value                           ¥ 164,065 $ 25,284 ¥ 283,981 $ 41,546 ¥ 232,319 $ 33,529
Redeemable Convertible Preferred Stock [Member] | Debt Note to Redeeming Shareholder [Member]                                      
Convertible Redeemable Preferred Shares [Line Items]                                      
Debt instrument term                           2 years 2 years        
Debt instrument interest rate                           10.00% 10.00%        
Redeemable Convertible Preferred Stock [Member] | Prior to Issuance of Series F Redeemable Convertible Preferred Stock [Member]                                      
Convertible Redeemable Preferred Shares [Line Items]                                      
Temporary equity redemption price compound interest per annum                           10.00% 10.00%        
Redeemable convertible preferred stock initial Redemption start date   Jul. 05, 2024                                  
Redeemable Convertible Preferred Stock [Member] | Post Issuance of Series F Redeemable Convertible Preferred Stock [Member]                                      
Convertible Redeemable Preferred Shares [Line Items]                                      
Temporary equity redemption price simple interest per annum                           8.00% 8.00%        
Redeemable convertible preferred stock modified Redemption start date   Feb. 10, 2025                                  
Share Purchase Agreement with Investors [Member] | Series A Redeemable Convertible Preferred Stock [Member]                                      
Convertible Redeemable Preferred Shares [Line Items]                                      
Temporary equity issued during the period shares | shares                       60,000,000              
Proceeds from Issuance of Redeemable Convertible Preferred Stock                       $ 3,000              
Stock issuance costs                       $ 20              
Share Purchase Agreement with Investors [Member] | Series B Redeemable Convertible Preferred Stock [Member]                                      
Convertible Redeemable Preferred Shares [Line Items]                                      
Temporary equity issued during the period shares | shares                     26,666,667                
Proceeds from Issuance of Redeemable Convertible Preferred Stock                     $ 4,000                
Stock issuance costs                     $ 41                
Share Purchase Agreement with Investors [Member] | Series E Redeemable Convertible Preferred Stock [Member]                                      
Convertible Redeemable Preferred Shares [Line Items]                                      
Temporary equity issued during the period shares | shares         83,474,263                            
Proceeds from Issuance of Redeemable Convertible Preferred Stock         $ 130,000                            
Stock issuance costs         $ 3,376                            
Share Purchase Agreement with Investors [Member] | Series C Redeemable Convertible Preferred Stock [Member]                                      
Convertible Redeemable Preferred Shares [Line Items]                                      
Temporary equity issued during the period shares | shares                   48,000,000                  
Proceeds from Issuance of Redeemable Convertible Preferred Stock                   $ 10,000                  
Stock issuance costs                   $ 40                  
Share Purchase Agreement with Investors [Member] | Series C One Redeemable Convertible Preferred Stock [Member] | Tranche One [Member]                                      
Convertible Redeemable Preferred Shares [Line Items]                                      
Temporary equity issued during the period shares | shares                 45,319,316                    
Proceeds from Issuance of Redeemable Convertible Preferred Stock                 $ 12,508                    
Stock issuance costs                 $ 86                    
Share Purchase Agreement with Investors [Member] | Series C Two Redeemable Convertible Preferred Stock [Member] | Tranche Two [Member]                                      
Convertible Redeemable Preferred Shares [Line Items]                                      
Temporary equity issued during the period shares | shares               42,251,744                      
Proceeds from Issuance of Redeemable Convertible Preferred Stock               $ 18,000                      
Stock issuance costs               $ 100                      
Share Purchase Agreement with Investors [Member] | Series C Three Redeemable Convertible Preferred Stock [Member] | Tranche Three [Member]                                      
Convertible Redeemable Preferred Shares [Line Items]                                      
Temporary equity issued during the period shares | shares             11,497,073                        
Proceeds from Issuance of Redeemable Convertible Preferred Stock             $ 6,001                        
Stock issuance costs             $ 32                        
Share Purchase Agreement with Investors [Member] | Series D Redeemable Convertible Preferred Stock [Member]                                      
Convertible Redeemable Preferred Shares [Line Items]                                      
Temporary equity issued during the period shares | shares           60,856,049                          
Proceeds from Issuance of Redeemable Convertible Preferred Stock           $ 43,394                          
Stock issuance costs           $ 1,132                          
Share Purchase Agreement with Investors [Member] | Series E One Redeemable Convertible Preferred Stock [Member] | Tranche One [Member]                                      
Convertible Redeemable Preferred Shares [Line Items]                                      
Temporary equity issued during the period shares | shares       32,373,031                              
Proceeds from Issuance of Redeemable Convertible Preferred Stock       $ 55,000                              
Stock issuance costs       $ 1,982                              
Share Purchase Agreement with Investors [Member] | Series E Two Redeemable Convertible Preferred Stock [Member] | Tranche Two [Member]                                      
Convertible Redeemable Preferred Shares [Line Items]                                      
Temporary equity issued during the period shares | shares     28,226,073                                
Proceeds from Issuance of Redeemable Convertible Preferred Stock     $ 50,000                                
Stock issuance costs     $ 1,917                                
Share Purchase Agreement with Investors [Member] | Series F Redeemable Convertible Preferred Stock [Member]                                      
Convertible Redeemable Preferred Shares [Line Items]                                      
Temporary equity issued during the period shares | shares   48,689,976                                  
Proceeds from Issuance of Redeemable Convertible Preferred Stock   $ 150,000                                  
Stock issuance costs   $ 1                                  
Share Purchase Agreement with Investors [Member] | Series F Plus Redeemable Convertible Preferred Stock [Member]                                      
Convertible Redeemable Preferred Shares [Line Items]                                      
Temporary equity issued during the period shares | shares 50,664,609                                    
Proceeds from Issuance of Redeemable Convertible Preferred Stock $ 270,000                                    
Stock issuance costs $ 3,080