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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 USD ($) | Dec. 31, 2014 CNY | Dec. 31, 2013 CNY | Dec. 31, 2012 CNY
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract] |  |  |  |
Net Revenues | $ 93,434 us-gaap_SalesRevenueServicesNet | 579,717 us-gaap_SalesRevenueServicesNet | 259,534 us-gaap_SalesRevenueServicesNet | 171,527 us-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 | 2,807 us-gaap_OtherOperatingIncome | 17,414 us-gaap_OtherOperatingIncome | 14,560 us-gaap_OtherOperatingIncome | 4,193 us-gaap_OtherOperatingIncome
Government grant | 587 us-gaap_RevenueFromGrants | 3,643 us-gaap_RevenueFromGrants | 2,792 us-gaap_RevenueFromGrants | 2,242 us-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 | 24,097 us-gaap_OperatingIncomeLoss | 149,507 us-gaap_OperatingIncomeLoss | 59,918 us-gaap_OperatingIncomeLoss | 21,112 us-gaap_OperatingIncomeLoss
Interest income | 2,741 us-gaap_InvestmentIncomeInterest | 17,009 us-gaap_InvestmentIncomeInterest | 2,058 us-gaap_InvestmentIncomeInterest | 1,132 us-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 | 26,600 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 165,036 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 29,760 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 22,244 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax benefit (expense) | (1,287)us-gaap_IncomeTaxExpenseBenefit | (7,987)us-gaap_IncomeTaxExpenseBenefit | 76,294 us-gaap_IncomeTaxExpenseBenefit | (18,001)us-gaap_IncomeTaxExpenseBenefit
Net income | 25,313 us-gaap_NetIncomeLoss | 157,049 us-gaap_NetIncomeLoss | 106,054 us-gaap_NetIncomeLoss | 4,243 us-gaap_NetIncomeLoss
Other comprehensive income (loss), net of tax |  |  |  |
Foreign currency translation gain (loss) | 1,957 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax | 12,145 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax | (5,496)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax | 58 us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Comprehensive income | $ 27,270 us-gaap_ComprehensiveIncomeNetOfTax | 169,194 us-gaap_ComprehensiveIncomeNetOfTax | 100,558 us-gaap_ComprehensiveIncomeNetOfTax | 4,301 us-gaap_ComprehensiveIncomeNetOfTax
Earnings per share for Class A and Class B ordinary shares outstanding: |  |  |  |
Basic | $ 0.07 us-gaap_EarningsPerShareBasic | 0.46 us-gaap_EarningsPerShareBasic | 0.45 us-gaap_EarningsPerShareBasic | 0.02 us-gaap_EarningsPerShareBasic
Diluted | $ 0.07 us-gaap_EarningsPerShareDiluted | 0.44 us-gaap_EarningsPerShareDiluted | 0.41 us-gaap_EarningsPerShareDiluted | 0.02 us-gaap_EarningsPerShareDiluted
Earnings per American Depositary Share ("ADS") (1 ADS represents 10 Class A ordinary shares) |  |  |  |
Basic | $ 0.74 wbai_EarningsPerAmericanDepositaryShareBasic | 4.62 wbai_EarningsPerAmericanDepositaryShareBasic | 4.45 wbai_EarningsPerAmericanDepositaryShareBasic |
Diluted | $ 0.71 wbai_EarningsPerAmericanDepositaryShareDiluted | 4.39 wbai_EarningsPerAmericanDepositaryShareDiluted | 4.08 wbai_EarningsPerAmericanDepositaryShareDiluted |
Weighted average number of Class A and Class B ordinary shares outstanding: |  |  |  |
Basic | 339,782,819 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 339,782,819 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 238,342,685 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 229,374,777 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted | 357,848,704 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 357,848,704 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 259,729,367 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 233,678,481 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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