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Certain Risks and Concentration - Major Customers (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2019
USD ($)
Major customers          
Revenues [1] ¥ 1,531,062 $ 219,923 ¥ 1,377,379 ¥ 1,575,092  
Customer concentration risk | Revenues | CMCC          
Major customers          
Revenues ¥ 94,500 $ 13,600 ¥ 113,900 ¥ 172,200  
Revenues generated (in percent) 6.20% 6.20% 8.30% 10.90%  
Customer concentration risk | Accounts receivable | CMCC | Amounts Due from Related Parties          
Major customers          
Due from CMCC ¥ 46,100   ¥ 59,900   $ 6,600
[1] (1)Transactions with related parties included in revenues, cost of revenues and operating expenses are as follows (Note 24): Net advertising revenues 67,393 41,482 50,700 7,283 Paid services revenues 139,149 87,131 72,454 10,407 Cost of revenues (57,057) (30,167) (26,728) (3,839) Sales and marketing expenses (748) (4,341) (4,157) (597) General and administrative expenses (6,245) (7,918) (7,045) (1,012)