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Ordinary Shares - Additional Information (Detail)
$ / shares in Units, ¥ in Thousands
 1 Months Ended 12 Months Ended
Jun. 08, 2021
Jul. 31, 2021
USD ($)
$ / shares
shares
May 31, 2021
CNY (¥)
shares
Mar. 31, 2021
shares
Apr. 30, 2020
CNY (¥)
shares
May 31, 2019
shares
Dec. 31, 2021
shares
Aug. 31, 2021
shares
Dec. 31, 2020
CNY (¥)
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
shares
Common Stock, Value   $ 50,000             ¥ 1 $ 50,000  
Common Stock, shares authorized   25,000,000,000             25,000,000,000 25,000,000,000  
Common Stock, par or stated value per share | $ / shares                   $ 0.000002  
Stockholders' Equity Note, Stock Split 1:50                    
Common Shares Held             29,633,200        
EatBetter Holding Limited [Member]                      
Stock Issued During Period, Shares, Issued for Services     2,601,000                
Stock Issued During Period, Value, Issued for Services | ¥     ¥ 0                
Common Shares Held             29,633,200   0 0 0
Offshore ESOP Platform [Member] | EatBetter Holding Limited [Member]                      
Number of ordinary shares issued     17,398,450 22,782,950              
Common Class A [Member]                      
Common Stock, shares, issued   6,108,000           264,528      
Conversion of stock, shares issued   10,364,900                  
Common Stock, Voting Rights   one vote per share                  
Common stock, conversion features   one                  
Shares repurchased during period             109,944        
Common Class A [Member] | Conversion of Redeemable Preferred Stock [Member]                      
Common Stock, shares, issued   250,826,100                  
Common Class B [Member]                      
Conversion of stock, shares issued   54,543,800                  
Common Stock, Voting Rights   twenty votes per share                  
American Depositary Shares [Member]                      
Common Stock, shares, issued   4,072,000           176,352      
Founder Shares [Member]                      
Stock Issued During Period, Shares, Issued for Services         4,745,200            
Stock Issued During Period, Value, Issued for Services | ¥         ¥ 0            
Other Designated Common Shares [Member]                      
Common Stock, par or stated value per share | $ / shares   $ 0.000002                  
Common stock,shares reserved   2,500,000,000                  
Other Designated Common Shares [Member] | Common Class A [Member]                      
Common Stock, par or stated value per share | $ / shares   $ 0.000002                  
Common Stock, shares, issued   20,000,000,000                  
Other Designated Common Shares [Member] | Common Class B [Member]                      
Common Stock, par or stated value per share | $ / shares   $ 0.000002                  
Common Stock, shares, issued   2,500,000,000                  
Ordinary Shares [Member]                      
Common Stock, shares, issued                 64,908,700 64,908,700  
Number of ordinary shares issued [1]             6,372,528        
Series Angel+ preferred shares [Member] | Founder Shares [Member]                      
Conversion of stock, shares issued           7,803,400          
[1] As of December 31, 2019, 2020 and 2021, nil, nil and 29,633,200 ordinary shares were held by EatBetter Holding Limited related to the Amended and Restated 2020 Share Incentive Plan (Note 14), respectively. These shares are considered legally issued but not outstanding.