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Long- term investments (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 02, 2020
CNY (¥)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Sep. 03, 2018
CNY (¥)
Long Term Investment [Line Items]            
Carrying value of cost method     ¥ 6,100 ¥ 5,700    
Impairment of provision   $ 0 0 1,000 ¥ 0  
Shanghai Three Drivers Culture Media Co Limited [Member]            
Long Term Investment [Line Items]            
Investment in cash           ¥ 4,000
Percentage of equity interest           40.00%
Carrying value of equity investment     ¥ 2,800 ¥ 2,200    
Beijing Hengpengzhixin Automobile Sales Co Ltd [Member]            
Long Term Investment [Line Items]            
Consideration for disposal of equity investments without readily determinable fair values ¥ 300