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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 22,742,660us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 22,742,660us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised                  2,660,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		         22,742,660us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		     
Options exercise price per share         $ 0.2us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		 $ 0.4us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		                        
Number of common shares issued during period                        17,250,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		         66,539,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		   
Ordinary shares, par value per share $ 0.00005us-gaap_CommonStockParOrStatedValuePerShare           $ 0.00005us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 $ 0.00005us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		         $ 0.00005us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 $ 0.00005us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		        
Aggregate consideration from shares issued from exercise of stock options $ 7,863,000us-gaap_ProceedsFromStockOptionsExercised 48,788,000us-gaap_ProceedsFromStockOptionsExercised 3,263,000us-gaap_ProceedsFromStockOptionsExercised                    $ 8,107,000us-gaap_ProceedsFromStockOptionsExercised
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		          
Conversion of ordinary shares, shares converted                 231,428,220us-gaap_ConversionOfStockSharesConverted1
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		           66,539,000us-gaap_ConversionOfStockSharesConverted1
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		      
Authorized share capital, ordinary shares 1,000,000,000us-gaap_CommonStockSharesAuthorized 1,000,000,000us-gaap_CommonStockSharesAuthorized         300,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 300,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		         700,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 700,000,000us-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                     19,230,769us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		               
Private placement, ordinary shares issued                     11,538,462wbai_StockIssuedDuringPeriodSharesPrivatePlacement
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		               
Ordinary shares issued, aggregate consideration                     $ 15,000us-gaap_StockIssuedDuringPeriodValueOther
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		              
Ordinary shares issued             96,634,529us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 262,197,451us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		         254,844,582us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 66,539,000us-gaap_CommonStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		        
Ordinary shares outstanding             96,634,529us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 262,197,451us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		         254,844,582us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 66,539,000us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember