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Subsequent events (Details)
¥ / shares in Units, ¥ in Millions
13 Months Ended
Jan. 27, 2021
CNY (¥)
Jan. 21, 2021
¥ / shares
shares
Nov. 20, 2018
$ / shares
shares
Aug. 31, 2020
shares
Jan. 31, 2021
CNY (¥)
Sep. 03, 2018
CNY (¥)
Subsequent Event [Line Items]            
Number of shares issued | shares       80,000    
Class A ordinary shares            
Subsequent Event [Line Items]            
Number of shares issued | shares     10,400,000      
Share price per ADS | $ / shares     $ 7.80      
Subsequent events | Class A ordinary shares            
Subsequent Event [Line Items]            
Number of shares issued | shares   16        
Share price per ADS | ¥ / shares   ¥ 4.25        
Fat Magpie (Beijing) technology Co., Ltd. ("Fat Magpie") | Subsequent events            
Subsequent Event [Line Items]            
Consideration for disposal of equity investments without readily determinable fair values | ¥ ¥ 5.4          
Shanghai Three Drivers Culture Media Co Limited [Member]            
Subsequent Event [Line Items]            
Investment in cash | ¥           ¥ 4.0
Equity Method Investment, Ownership Percentage           40.00%
Shanghai Three Drivers Culture Media Co Limited [Member] | Subsequent events            
Subsequent Event [Line Items]            
Investment in cash | ¥         ¥ 2.3  
Percentage of additional equity interest         9  
Equity Method Investment, Ownership Percentage         49.00%