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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Share-based compensation ¥ 648,025 $ 94,251 ¥ 257,661 ¥ 157,286
Cost of revenues [Member]        
Share-based compensation 74,339 10,812 42,759 15,894
Research and development expenses [Member]        
Share-based compensation 225,173 32,750 122,348 78,816
Sales and marketing expenses [Member]        
Share-based compensation 5,723 832 4,417 3,107
General and administrative expenses [Member]        
Share-based compensation ¥ 342,790 $ 49,857 ¥ 88,137 ¥ 59,469
Class A common shares [Member]        
Number of common shares represented by each ADS 20 20 20 20