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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (DEFICIT)
In Thousands, except Share data
Total
USD ($)
Total
CNY
Ordinary shares [Member]
USD ($)
Ordinary shares [Member]
CNY
Additional paid-in capital [Member]
USD ($)
Additional paid-in capital [Member]
CNY
Accumulated other comprehensive income (loss) [Member]
USD ($)
Accumulated other comprehensive income (loss) [Member]
CNY
Accumulated deficit [Member]
USD ($)
Accumulated deficit [Member]
CNY
Class A Ordinary shares [Member]
USD ($)
Class A Ordinary shares [Member]
CNY
Class A Ordinary shares [Member]
Ordinary shares [Member]
Class B Ordinary shares [Member]
USD ($)
Class B Ordinary shares [Member]
CNY
Class B Ordinary shares [Member]
Ordinary shares [Member]
Balance at Dec. 31, 2011   74,349us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest   84us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		   247,051us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		   15,930us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		   (188,716)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		            
Balance, shares at Dec. 31, 2011                                230,768,220us-gaap_SharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Net income   4,243us-gaap_NetIncomeLoss                  4,243us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		         4,243us-gaap_NetIncomeLoss
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		  
Other comprehensive income (loss) Foreign currency translation gain (loss)   58us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax             58us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		                 
Repurchase and cancellation of ordinary shares   (47,980)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue   (5)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		   (47,975)us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		                      
Repurchase and cancellation of ordinary shares, shares                                (19,250,000)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Issuance of ordinary shares   43,006us-gaap_StockIssuedDuringPeriodValueNewIssues   5us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		   43,001us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		                      
Issuance of ordinary shares, shares                                17,250,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Share-based compensation   13,704us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition        13,704us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		                      
Dividend declared   (90,000)us-gaap_Dividends                  (90,000)us-gaap_Dividends
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		            
Balance at Dec. 31, 2012   (2,620)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest   84us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		   255,781us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		   15,988us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		   (274,473)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		            
Balance, shares at Dec. 31, 2012                                228,768,220us-gaap_SharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Net income   106,054us-gaap_NetIncomeLoss                  106,054us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		   106,054us-gaap_NetIncomeLoss
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		     95,179us-gaap_NetIncomeLoss
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		  
Other comprehensive income (loss) Foreign currency translation gain (loss)   (5,496)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax             (5,496)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		                 
Issuance of ordinary shares from private placement   91,994wbai_StockIssuedDuringPeriodValuePrivatePlacement   3wbai_StockIssuedDuringPeriodValuePrivatePlacement
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		   91,991wbai_StockIssuedDuringPeriodValuePrivatePlacement
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		                      
Issuance of ordinary shares from private placement, shares                                11,538,462wbai_StockIssuedDuringPeriodSharesPrivatePlacement
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Issuance of ordinary shares from exercise of share options   3,263us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised   1us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		   3,262us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		                      
Issuance of ordinary shares from exercise of share options, shares                                2,660,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Issuance of ordinary shares from conversion of convertible note 25,000us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities 153,325us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities   6us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		   153,319us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		                      
Issuance of ordinary shares from conversion of convertible note, shares                                19,230,769us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Issuance of ordinary shares   455,339us-gaap_StockIssuedDuringPeriodValueNewIssues   20us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		   455,319us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		                      
Issuance of ordinary shares, shares                         66,539,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		       
Share-based compensation   7,561us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition        7,561us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		                      
Balance at Dec. 31, 2013   809,420us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest   114us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		   967,233us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		   10,492us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		   (168,419)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		            
Balance, shares at Dec. 31, 2013                         66,539,000us-gaap_SharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		     262,197,451us-gaap_SharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Net income 25,313us-gaap_NetIncomeLoss 157,049us-gaap_NetIncomeLoss                  157,049us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 25,313us-gaap_NetIncomeLoss
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 157,049us-gaap_NetIncomeLoss
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		   12,670us-gaap_NetIncomeLoss
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 78,604us-gaap_NetIncomeLoss
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		  
Other comprehensive income (loss) Foreign currency translation gain (loss) 1,957us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax 12,145us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax             12,145us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		                 
Conversion of Class B to Class A ordinary shares                                     
Conversion of Class B to Class A ordinary shares, shares                         165,562,922wbai_StockIssuedDuringPeriodSharesConversion
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		     (165,562,922)wbai_StockIssuedDuringPeriodSharesConversion
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
Issuance of ordinary shares from exercise of share options   49,086us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised   7us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		   49,079us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		                      
Issuance of ordinary shares from exercise of share options, shares 22,742,660us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised                       22,742,660us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		       
Share-based compensation   89,922us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition        89,922us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		                      
Balance at Dec. 31, 2014 $ 180,128us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 1,117,622us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest $ 20us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 121us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 $ 178,293us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 1,106,234us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember		 $ 3,648us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 22,637us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember		 $ (1,833)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 (11,370)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		            
Balance, shares at Dec. 31, 2014                         254,844,582us-gaap_SharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		     96,634,529us-gaap_SharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember