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Principal Accounting Policies - Sales and marketing expenses (Details)
¥ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Sales and marketing expenses        
Total advertising and promotion expenses including traffic acquisition expenses ¥ 385.4 $ 55.4 ¥ 376.7 ¥ 329.7
Total advertising and promotion expenses from advertising-for-advertising barter transactions ¥ 7.3 $ 1.0 ¥ 4.3