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Principal Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Schedule of Investments [Line Items]

Schedule of estimated useful lives of property and equipment

Category		Estimated useful life
Computers and equipment		3 years
Buildings		16 - 17 years
Furniture and fixtures		3 - 5 years
Vehicles		3 - 5 years
Software		5 years
Leasehold improvements		Over the shorter of the lease term or the estimated useful life of the asset 1 – 9 years

Schedule of classification of share-based compensation expense

		For the Years Ended December 31,
		2013		2014		2015
		RMB		RMB		RMB		US$ (Note 2(d))
Cost of revenue		—		800		784		121
Research and product development		—		1,972		3,538		546
Sales and marketing		—		857		1,136		175
General and administrative		—		35,544		59,685		9,214
Total		—		39,173		65,143		10,056

The Affiliated Entities [Member]

Schedule of Investments [Line Items]

Schedule of financial statement amounts and balances of the Affiliated Entities were included in the consolidated financial statements

			As of December 31,
			2014			2015
			RMB			RMB				US$ (Note 2(d))
ASSETS
Current assets
Cash and cash equivalents			102,356				376,883				58,181
Restricted cash			44,030				138,997				21,457
Short-term investments			100,000				499,402				77,094
Accounts receivable, net			8,645				116,669				18,011
Intercompany receivables			65,474				130,945				20,214
Prepayments and other current assets			566,731				1,402,919				216,573
Total current assets			887,236				2,665,815				411,530

Non-current assets
Property and equipment, net			22,600				72,582				11,205
Intangible assets, net			1,975				100,125				15,457
Goodwill			—				136,569				21,083
Other non-current assets			14,290				323,403				49,925
Total non-current assets			38,865				632,679				97,670
Total assets			926,101				3,298,494				509,200

LIABILITIES
Current liabilities
Accounts payable			373,464				1,036,226				159,966
Salary and welfare payable			66,075				123,071				18,999
Taxes payable			2,079				6,668				1,029
Advances from customers			638,803				1,223,313				188,847
Intercompany payable			52,114				1,263,100				194,989
Accrued expenses and other current liabilities			87,657				936,526				144,575
Total current liabilities			1,220,192				4,588,904				708,405
Non-current liabilities			—				39,750				6,136
Total liabilities			1,220,192				4,628,654				714,541

		For the Years Ended December 31,
		2013		2014		2015
		RMB		RMB		RMB		US$ (Note 2(d))
Net revenues		1,937,485		3,736,473		7,755,914		1,197,307
Net loss		(39,597	)	(128,299	)	(1,051,691	)	(162,353	)
Net cash provided by/(used in) operating activities		161,148		(51,446	)	(87,299	)	(13,477	)
Net cash provided by/(used in) investing activities		(201,058	)	72,161		(1,374,894	)	(212,247	)
Net cash provided by financing activities		-		700		1,736,720		268,103