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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, 2024
CNY (¥)
$ / shares
shares
Dec. 31, 2024
CNY (¥)
¥ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
Dec. 31, 2023
CNY (¥)
¥ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
Dec. 31, 2022
CNY (¥)
¥ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2024
USD ($)
shares
Jun. 30, 2021
shares
2019 incentive plan                      
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]                      
Shares authorized under the plan (in shares) 137,186,000 137,186,000                  
Incremental compensation cost | ¥   ¥ 0                  
Assumptions                      
Expected volatility       53.87%   53.06%   51.97%      
Contractual term (in year)       10 years   10 years   10 years      
Risk-free interest rate       4.22%   3.77%   3.57%      
Number of shares                      
Beginning balance       89,155,596   94,028,978   94,830,430      
Granted during the year       84,256   875,004   3,167,881      
Exercised during the year       (10,243,525)   (674,082)   (2,107,600)      
Forfeited / Cancelled during the year       (3,221,189)   (5,074,304)   (1,861,733)      
Ending balance       75,775,138   89,155,596   94,028,978 94,830,430    
Exercisable at the end     71,244,501 71,244,501           71,244,501  
Weighted average exercise price US$/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$ | $         $ 1,997,085   $ 3,881,516   $ 4,324,268 $ 477,368  
Weighted average remaining contractual years                      
Weighted average remaining contractual years       5 years 7 months 13 days   6 years 7 months 13 days   7 years 6 months 10 days 8 years 5 months 8 days    
Unrecognized share-based compensation expenses, recognition period       6 months 29 days              
Weighted average grant date fair value of share options | ¥ / shares       ¥ 0.11   ¥ 0.27   ¥ 0.26      
Share based compensation expense | ¥       ¥ 180   ¥ 4,670   ¥ 13,880      
Unrecognized share-based compensation expenses | ¥     $ 340 ¥ 340              
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)     18,740,479 18,740,479           18,740,479  
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 Stock Option                      
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   0      
Certain directors and senior management | 2019 incentive plan                      
Number of shares                      
Granted during the year       84,256   875,004   3,167,881