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Share-Based Compensation - Summary of Group's option activities (Details)
$ / shares in Units, ¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2019
CNY (¥)
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2018
CNY (¥)
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2017
CNY (¥)
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2019
CNY (¥)
shares
Weighted average remaining contractual term                
Fair value of vested options $ 322,191 ¥ 2,243,028   ¥ 45,979   ¥ 13,525    
Unrecognized share-based compensation expense relating to unvested options $ 1,435,609             ¥ 9,994,423
Weighted-average period for recognition of share-based compensation expense relating to unvested options 4 years 9 months 29 days 4 years 9 months 29 days            
2015 Plan and the 2018 Plan                
Number of share options                
Outstanding at beginning of the year (in shares) | shares 629,592,860 629,592,860 272,442,860 272,442,860 203,733,060 203,733,060    
Granted (in shares) | shares 76,665,380 76,665,380 359,390,000 359,390,000 78,560,000 78,560,000    
Forfeited (in shares) | shares (7,937,140) (7,937,140) (2,240,000) (2,240,000) (9,850,200) (9,850,200)    
Outstanding at end of the year (in shares) | shares 698,321,100 698,321,100 629,592,860 629,592,860 272,442,860 272,442,860 203,733,060  
Vested and expected to vest at end of the year (in shares) | shares 698,321,100             698,321,100
Exercisable at end of the year (in shares) | shares 298,464,265             298,464,265
Weighted average exercise price                
Outstanding at beginning of the year (in dollars per share) $ 0.0065   $ 0.0065   $ 0.0065      
Granted (in dollars per share) 0.0065   0.0065   0.0065      
Forfeited (in dollars per share) 0.0065   0.0065   0.0065      
Outstanding at end of the year (in dollars per share) 0.0065   0.0065   0.0065   $ 0.0065  
Vested and expected to vest at end of the year (in dollars per share) 0.0065              
Exercisable at end of the year (in dollars per share) 0.0065              
Weighted average grant date fair value                
Outstanding at beginning of the year 2.0931   0.0706   0.0301      
Granted 7.7632   3.6289   0.1736      
Forfeited 5.7059   2.5006   0.0544      
Outstanding at end of the year 2.6745   $ 2.0931   $ 0.0706   $ 0.0301  
Vested and expected to vest at end of the year 2.6745              
Exercisable at end of the year $ 1.1083              
Aggregate intrinsic value                
Outstanding at beginning of the year (in dollars) | $ $ 3,527,924   $ 144,258   $ 10,390      
Outstanding at end of the year (in dollars) | $ (6,598,087)   $ 3,527,924   $ 144,258   $ 10,390  
Vested and expected to vest at end of the year (in dollars) | $ 6,598,087              
Exercisable at end of the year (in dollars) | $ $ 2,820,040              
Weighted average remaining contractual term                
Outstanding (in years) 7 years 9 months 29 days 7 years 9 months 29 days 8 years 7 months 20 days 8 years 7 months 20 days 8 years 6 months 25 days 8 years 6 months 25 days 9 years 3 months  
Vested and expected to vest at end of the year (in years) 7 years 9 months 29 days 7 years 9 months 29 days            
Exercisable at end of the year (in years) 7 years 3 days 7 years 3 days