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Share-based Compensation - 2019 Incentive Plan (Details)
¥ / shares in Units, $ / shares in Units, ¥ in Thousands
 1 Months Ended 12 Months Ended
Sep. 30, 2019
$ / shares
shares
Sep. 30, 2019
CNY (¥)
shares
Dec. 31, 2023
CNY (¥)
$ / shares
shares
Dec. 31, 2023
CNY (¥)
¥ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
Dec. 31, 2022
CNY (¥)
¥ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2021
CNY (¥)
¥ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2023
USD ($)
shares
Jun. 30, 2021
shares
2019 Incentive Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares authorized under the plan (in shares) 137,186,000 137,186,000                  
Incremental compensation cost | ¥   ¥ 0                  
Number of replaced share options               7,475,213      
Assumptions                      
Expected volatility       53.06%   51.97%          
Contractual term (in year)       10 years   10 years   10 years      
Risk-free interest rate       3.77%   3.57%          
Number of shares                      
Beginning balance       94,028,978   94,830,430   88,240,084      
Granted during the year       875,004   3,167,881   32,765,413      
Exercised during the year       674,082   2,107,600   18,031,675      
Forfeited / Cancelled during the year       (5,074,304)   (1,861,733)   (8,143,392)      
Ending balance       89,155,596   94,028,978   94,830,430 88,240,084    
Exercisable at the end     76,201,677 76,201,677           76,201,677  
Weighted average exercise price US$/Share                      
Outstanding at beginning of period | $ / shares     $ 0.0001   $ 0.0001   $ 0.0001        
Granted during the year | $ / shares     0.0001   0.0001   0.0001        
Exercised during the year | $ / shares     0.0001   0.0001   0.0001        
Forfeited during the year | $ / shares     0.0001   0.0001   0.0001        
Outstanding at end of period | $ / shares $ 0.0001   $ 0.0001   $ 0.0001   $ 0.0001   $ 0.0001    
Aggregate intrinsic value                      
Aggregate intrinsic value US$ | $         $ 3,881,516   $ 4,324,268   $ 9,847,593 $ 1,997,085  
Weighted average remaining contractual years                      
Weighted average remaining contractual years       6 years 7 months 13 days   7 years 6 months 10 days   8 years 5 months 8 days 8 years 9 months 7 days    
Unrecognized share-based compensation expenses, recognition period       9 months 14 days              
Weighted average grant date fair value of share options | ¥ / shares       ¥ 0.27   ¥ 0.26   ¥ 0.54      
Share-based compensation expenses recognized for share options | ¥       ¥ 4,670   ¥ 12,380   ¥ 15,020      
Unrecognized share-based compensation expenses | ¥     $ 1,930 ¥ 1,930              
2019 Incentive Plan | Minimum                      
Assumptions                      
Expected volatility               49.29%      
Risk-free interest rate               1.38%      
2019 Incentive Plan | Maximum                      
Assumptions                      
Expected volatility               50.47%      
Risk-free interest rate               1.45%      
2019 Incentive Plan | Class A ordinary shares                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares authorized under the plan (in shares)     15,603,546 15,603,546           15,603,546  
2014 and 2016 Incentive Plan                      
Number of shares                      
Forfeited / Cancelled during the year   (91,548,120)                  
Updated Incentive Plan 2019                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Shares authorized under the plan (in shares)                     162,186,000
Employee options                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Vesting period (in years)       4 years              
Expiration period (in years)       10 years              
Replacement Share Options | 2019 Incentive Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Number of replaced share options       0   0          
Certain Directors And Senior Management | 2019 Incentive Plan                      
Number of shares                      
Granted during the year       875,004   3,167,881   32,765,413