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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 USD ($)	Dec. 31, 2014 CNY	Dec. 31, 2013 CNY	Dec. 31, 2012 CNY
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net Revenues	$ 93,434us-gaap_SalesRevenueServicesNet	579,717us-gaap_SalesRevenueServicesNet	259,534us-gaap_SalesRevenueServicesNet	171,527us-gaap_SalesRevenueServicesNet
Operating expenses:
Cost of services	(8,689)us-gaap_CostOfServices	(53,909)us-gaap_CostOfServices	(27,818)us-gaap_CostOfServices	(18,476)us-gaap_CostOfServices
Sales and marketing	(28,025)us-gaap_SellingAndMarketingExpense	(173,883)us-gaap_SellingAndMarketingExpense	(84,596)us-gaap_SellingAndMarketingExpense	(45,794)us-gaap_SellingAndMarketingExpense
General and administrative	(25,192)us-gaap_GeneralAndAdministrativeExpense	(156,309)us-gaap_GeneralAndAdministrativeExpense	(73,190)us-gaap_GeneralAndAdministrativeExpense	(57,784)us-gaap_GeneralAndAdministrativeExpense
Service development expenses	(9,573)us-gaap_ResearchAndDevelopmentExpense	(59,398)us-gaap_ResearchAndDevelopmentExpense	(28,686)us-gaap_ResearchAndDevelopmentExpense	(26,571)us-gaap_ResearchAndDevelopmentExpense
Write-off of deferred offering expenses	(522)us-gaap_WriteOffOfDeferredDebtIssuanceCost	(3,241)us-gaap_WriteOffOfDeferredDebtIssuanceCost		(6,404)us-gaap_WriteOffOfDeferredDebtIssuanceCost
Total operating expenses	(72,001)us-gaap_CostsAndExpenses	(446,740)us-gaap_CostsAndExpenses	(214,290)us-gaap_CostsAndExpenses	(155,029)us-gaap_CostsAndExpenses
Other operating income	2,807us-gaap_OtherOperatingIncome	17,414us-gaap_OtherOperatingIncome	14,560us-gaap_OtherOperatingIncome	4,193us-gaap_OtherOperatingIncome
Government grant	587us-gaap_RevenueFromGrants	3,643us-gaap_RevenueFromGrants	2,792us-gaap_RevenueFromGrants	2,242us-gaap_RevenueFromGrants
Other operating expenses	(730)us-gaap_OtherCostAndExpenseOperating	(4,527)us-gaap_OtherCostAndExpenseOperating	(2,678)us-gaap_OtherCostAndExpenseOperating	(1,821)us-gaap_OtherCostAndExpenseOperating
Operating profit	24,097us-gaap_OperatingIncomeLoss	149,507us-gaap_OperatingIncomeLoss	59,918us-gaap_OperatingIncomeLoss	21,112us-gaap_OperatingIncomeLoss
Interest income	2,741us-gaap_InvestmentIncomeInterest	17,009us-gaap_InvestmentIncomeInterest	2,058us-gaap_InvestmentIncomeInterest	1,132us-gaap_InvestmentIncomeInterest
Interest expense	(57)us-gaap_InterestExpense	(356)us-gaap_InterestExpense	(5,407)us-gaap_InterestExpense
Changes in fair value of the derivative component of the convertible note			(26,809)us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet
Changes in fair value of the structured deposit	(181)wbai_UnrealizedGainLossOnChangeInFairValueOfShortTermInvestment	(1,124)wbai_UnrealizedGainLossOnChangeInFairValueOfShortTermInvestment
Income before income tax	26,600us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	165,036us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	29,760us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	22,244us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax benefit (expense)	(1,287)us-gaap_IncomeTaxExpenseBenefit	(7,987)us-gaap_IncomeTaxExpenseBenefit	76,294us-gaap_IncomeTaxExpenseBenefit	(18,001)us-gaap_IncomeTaxExpenseBenefit
Net income	25,313us-gaap_NetIncomeLoss	157,049us-gaap_NetIncomeLoss	106,054us-gaap_NetIncomeLoss	4,243us-gaap_NetIncomeLoss
Other comprehensive income (loss), net of tax
Foreign currency translation gain (loss)	1,957us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	12,145us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	(5,496)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax	58us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Comprehensive income	$ 27,270us-gaap_ComprehensiveIncomeNetOfTax	169,194us-gaap_ComprehensiveIncomeNetOfTax	100,558us-gaap_ComprehensiveIncomeNetOfTax	4,301us-gaap_ComprehensiveIncomeNetOfTax
Earnings per share for Class A and Class B ordinary shares outstanding:
Basic	$ 0.07us-gaap_EarningsPerShareBasic	0.46us-gaap_EarningsPerShareBasic	0.45us-gaap_EarningsPerShareBasic	0.02us-gaap_EarningsPerShareBasic
Diluted	$ 0.07us-gaap_EarningsPerShareDiluted	0.44us-gaap_EarningsPerShareDiluted	0.41us-gaap_EarningsPerShareDiluted	0.02us-gaap_EarningsPerShareDiluted
Earnings per American Depositary Share ("ADS") (1 ADS represents 10 Class A ordinary shares)
Basic	$ 0.74wbai_EarningsPerAmericanDepositaryShareBasic	4.62wbai_EarningsPerAmericanDepositaryShareBasic	4.45wbai_EarningsPerAmericanDepositaryShareBasic
Diluted	$ 0.71wbai_EarningsPerAmericanDepositaryShareDiluted	4.39wbai_EarningsPerAmericanDepositaryShareDiluted	4.08wbai_EarningsPerAmericanDepositaryShareDiluted
Weighted average number of Class A and Class B ordinary shares outstanding:
Basic	339,782,819us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	339,782,819us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	238,342,685us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	229,374,777us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted	357,848,704us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	357,848,704us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	259,729,367us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	233,678,481us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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