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ORDINARY SHARES (Details) | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 USD ($) | Dec. 31, 2014 CNY | Dec. 31, 2013 CNY | Dec. 31, 2012 CNY | Dec. 31, 2014 Minimum [Member] USD ($) | Dec. 31, 2014 Maximum [Member] USD ($) | Dec. 31, 2014 Class B Ordinary shares [Member] USD ($) | Dec. 31, 2013 Class B Ordinary shares [Member] USD ($) | Nov. 30, 2013 Class B Ordinary shares [Member] Ordinary shares [Member] | Dec. 31, 2014 Class B Ordinary shares [Member] Ordinary shares [Member] | Dec. 31, 2013 Class B Ordinary shares [Member] Ordinary shares [Member] USD ($) | Dec. 31, 2012 Class B Ordinary shares [Member] Ordinary shares [Member] | Dec. 31, 2014 Class A Ordinary shares [Member] USD ($) | Dec. 31, 2013 Class A Ordinary shares [Member] USD ($) | Nov. 30, 2013 Class A Ordinary shares [Member] Ordinary shares [Member] | Dec. 31, 2014 Class A Ordinary shares [Member] Ordinary shares [Member] | Dec. 31, 2013 Class A Ordinary shares [Member] Ordinary shares [Member] | Dec. 31, 2012 Class A Ordinary shares [Member] Ordinary shares [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of ordinary shares from exercise of share options, shares | 22,742,660 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 22,742,660 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  |  |  |  |  |  |  |  | 2,660,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  | 22,742,660 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Options exercise price per share |  |  |  |  | $ 0.2 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember | $ 0.4 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |  |  |  |  |  |  |
Number of common shares issued during period |  |  |  |  |  |  |  |  |  |  |  | 17,250,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  | 66,539,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |
Ordinary shares, par value per share | $ 0.00005 us-gaap_CommonStockParOrStatedValuePerShare |  |  |  |  |  | $ 0.00005 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ 0.00005 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |  |  |  | $ 0.00005 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 0.00005 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  |  |
Aggregate consideration from shares issued from exercise of stock options | $ 7,863,000 us-gaap_ProceedsFromStockOptionsExercised | 48,788,000 us-gaap_ProceedsFromStockOptionsExercised | 3,263,000 us-gaap_ProceedsFromStockOptionsExercised |  |  |  |  |  |  |  |  |  | $ 8,107,000 us-gaap_ProceedsFromStockOptionsExercised / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  |  |  |
Conversion of ordinary shares, shares converted |  |  |  |  |  |  |  |  | 231,428,220 us-gaap_ConversionOfStockSharesConverted1 / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  | 66,539,000 us-gaap_ConversionOfStockSharesConverted1 / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Authorized share capital, ordinary shares | 1,000,000,000 us-gaap_CommonStockSharesAuthorized | 1,000,000,000 us-gaap_CommonStockSharesAuthorized |  |  |  |  | 300,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 300,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |  |  |  | 700,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 700,000,000 us-gaap_CommonStockSharesAuthorized / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  |  |
Voting rights per share |  |  |  |  |  |  | ten votes per share |  |  |  |  |  | one vote per share |  |  |  |  |
Ordinary shares conversion basis |  |  |  |  |  |  | Each share of Class B ordinary shares is entitled to ten votes per share and is convertible into one Class A ordinary share at any time by the holder thereof. |  |  |  |  |  |  |  |  |  |  |
Conversion of convertible note, ordinary shares issued |  |  |  |  |  |  |  |  |  |  | 19,230,769 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Private placement, ordinary shares issued |  |  |  |  |  |  |  |  |  |  | 11,538,462 wbai_StockIssuedDuringPeriodSharesPrivatePlacement / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Ordinary shares issued, aggregate consideration |  |  |  |  |  |  |  |  |  |  | $ 15,000 us-gaap_StockIssuedDuringPeriodValueOther / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Ordinary shares issued |  |  |  |  |  |  | 96,634,529 us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 262,197,451 us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |  |  |  | 254,844,582 us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 66,539,000 us-gaap_CommonStockSharesIssued / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  |  |
Ordinary shares outstanding |  |  |  |  |  |  | 96,634,529 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | 262,197,451 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |  |  |  | 254,844,582 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 66,539,000 us-gaap_CommonStockSharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |  |  |

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