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Share-Based Compensation - Summary of RSU activities (Details) - 12 months ended Dec. 31, 2018
$ / shares in Units, ¥ in Thousands, $ in Thousands
$ / shares
CNY (¥)
shares
USD ($)
$ / shares
shares
CNY (¥)
shares
Weighted average grand date fair value        
Weighted-average period for recognition of share-based compensation expense relating to unvested options   5 years 7 months 21 days    
2018 Plan | RSU        
Number of RSUs        
Granted (in shares) | shares   8,295,240    
Outstanding at end of the year (in shares) | shares   8,295,240    
Vested and expected to vest at end of the year (in shares) | shares     8,295,240 8,295,240
Weighted average grand date fair value        
Granted $ 6.2519      
Outstanding at end of the year 6.2519      
Vested and expected to vest at end of the year     6.2519  
Weighted average grant date fair value of RSUs granted $ 6.2519   $ 6.2519  
Total fair value of RSUs vested during the period | ¥   ¥ 0    
Unrecognized share-based compensation expenses     $ 47,278 ¥ 325,060
Weighted-average period for recognition of share-based compensation expense relating to unvested options   3 years 9 months 22 days