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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

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- Definition

The number of underlying shares represented by one American Depository Receipt (ADR) or Global Depository Receipt (GDR). A value of '3' means that one ADR represents 3 underlying shares. If one underlying share represents 2 ADR's then the value would be represented as '0.5'.

+ References

No definition available.

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

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