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Property and equipment, net (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2019
CNY (¥)
Property and equipment, net          
Total property and equipment $ 6,743,165   ¥ 40,215,565   ¥ 46,944,565
Accumulated depreciation (3,850,386)   (17,000,768)   (26,805,614)
Property and equipment, net 2,892,779   23,214,797   20,138,951
Depreciation 1,514,668 ¥ 10,544,813 9,245,203 ¥ 4,687,503  
Gains from the disposal of property and equipment 343 ¥ 2,389 66 ¥ 103  
Computer and transmission equipment          
Property and equipment, net          
Total property and equipment 3,095,880   15,522,913   21,552,895
Furniture and office equipment          
Property and equipment, net          
Total property and equipment 536,160   3,659,047   3,732,638
Leasehold improvements          
Property and equipment, net          
Total property and equipment 2,993,899   20,217,502   20,842,929
Motor vehicles          
Property and equipment, net          
Total property and equipment $ 117,226   ¥ 816,103   ¥ 816,103