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Mainland China Employee Contribution Plan	12 Months Ended
	Dec. 31, 2017
Text Block [Abstract]
Mainland China Employee Contribution Plan	20. MAINLAND CHINA EMPLOYEE CONTRIBUTION PLAN As stipulated by the regulations of the PRC, full-time employees of the Company in the PRC participate in a government-mandated multiemployer defined contribution plan organized by municipal and provincial governments. Under the plan, certain pension benefits, medical care, unemployment insurance, employee housing fund and other welfare benefits are provided to employees. The Company is required to make contributions to the plan based on certain percentages of employees’ salaries. The total expenses for the plan were RMB89,571, RMB130,630 and RMB134,053 (US$20,604), respectively, for the years ended December 31, 2015, 2016 and 2017.

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The entire disclosure for mainland China employee contribution plan.

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