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Share-based Compensation - Summary of activities of the service based restricted share units (Details) - Restricted share units - CNY (¥)
¥ / shares in Units, ¥ in Thousands
1 Months Ended 12 Months Ended
Jun. 19, 2017
Dec. 19, 2016
Dec. 31, 2016
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Number of restricted share units            
Unvested at Beginning Balance (in shares)       34,239,273 55,569,218 63,728,544
Granted (in shares)           7,772,731
Vested (in shares)       (1,177,684) (16,942,984) (15,932,057)
Forfeited (in shares)       (2,519,014) (4,386,961)  
Cancelled on September 7, 2019       (30,542,575)    
Unvested at Ending Balance (in shares)     63,728,544   34,239,273 55,569,218
Weighted Average Grant Date Fair Value            
Unvested at Beginning Balance (in US dollar per share)       ¥ 0.30 ¥ 0.31 ¥ 0.28
Granted (in US dollar per share)           0.47
Vested (in US dollar per share)       0.47 0.30 0.28
Forfeited (in US dollar per share)       0.38 0.35  
Cancelled on September 7, 2019       ¥ 0.29    
Unvested at Ending Balance (in US dollar per share)     ¥ 0.28   ¥ 0.30 ¥ 0.31
Beijing Duoke            
Weighted Average Grant Date Fair Value            
Total unrecognized compensation expense       ¥ 0    
Unrecognized compensation expense, recognition period       0 years    
Employees | Beijing Duoke            
Number of restricted share units            
Granted (in shares) 7,772,731 63,728,544 9,382,236      
Weighted Average Grant Date Fair Value            
Total share based compensation expenses       ¥ 3,140 ¥ 5,090 ¥ 4,860
Total unrecognized compensation expense         ¥ 10,410 ¥ 17,070
Unrecognized compensation expense, recognition period         2 years 22 days 3 years 26 days