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ORGANIZATION (Carrying Amounts of Assets and Liabilities of VIEs) (Details) In Thousands, unless otherwise specified | Dec. 31, 2014 USD ($) | Dec. 31, 2014 CNY | Dec. 31, 2013 USD ($) | Dec. 31, 2013 CNY | Dec. 31, 2012 CNY | Dec. 31, 2011 CNY | Dec. 31, 2014 Variable Interest Entity, Primary Beneficiary [Member] USD ($) | Dec. 31, 2014 Variable Interest Entity, Primary Beneficiary [Member] CNY | Dec. 31, 2013 Variable Interest Entity, Primary Beneficiary [Member] CNY
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Current assets: |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ 78,257 us-gaap_CashAndCashEquivalentsAtCarryingValue | 485,556 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 87,728 us-gaap_CashAndCashEquivalentsAtCarryingValue | 544,318 us-gaap_CashAndCashEquivalentsAtCarryingValue | 31,555 us-gaap_CashAndCashEquivalentsAtCarryingValue | 63,930 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 53,298 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 330,690 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 27,831 us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Restricted cash | 2,042 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue | 12,669 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue |  | 71,662 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue |  |  | 2,042 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 12,667 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 15,090 us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Short-term investments | 11,311 us-gaap_ShortTermInvestments | 70,182 us-gaap_ShortTermInvestments |  |  |  |  | 11,311 us-gaap_ShortTermInvestments / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 70,182 us-gaap_ShortTermInvestments / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |
Accounts receivable | 11,998 us-gaap_AccountsReceivableNetCurrent | 74,445 us-gaap_AccountsReceivableNetCurrent |  | 62,522 us-gaap_AccountsReceivableNetCurrent |  |  | 7,825 us-gaap_AccountsReceivableNetCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 48,550 us-gaap_AccountsReceivableNetCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 50,778 us-gaap_AccountsReceivableNetCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Amounts due from intergroup companies |  |  |  |  |  |  | 1,690 wbai_AmountsDueFromIntergroupCompanies / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 10,484 wbai_AmountsDueFromIntergroupCompanies / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 105,169 wbai_AmountsDueFromIntergroupCompanies / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Prepayments and other current assets | 25,447 us-gaap_PrepaidExpenseAndOtherAssetsCurrent | 157,887 us-gaap_PrepaidExpenseAndOtherAssetsCurrent |  | 94,273 us-gaap_PrepaidExpenseAndOtherAssetsCurrent |  |  | 24,055 us-gaap_PrepaidExpenseAndOtherAssetsCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 149,256 us-gaap_PrepaidExpenseAndOtherAssetsCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 92,395 us-gaap_PrepaidExpenseAndOtherAssetsCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Deferred tax assets, current portion | 6,408 us-gaap_DeferredTaxAssetsNetCurrent | 39,761 us-gaap_DeferredTaxAssetsNetCurrent |  | 16,016 us-gaap_DeferredTaxAssetsNetCurrent |  |  | 6,297 us-gaap_DeferredTaxAssetsNetCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 39,068 us-gaap_DeferredTaxAssetsNetCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 15,287 us-gaap_DeferredTaxAssetsNetCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Total current assets | 202,494 us-gaap_AssetsCurrent | 1,256,403 us-gaap_AssetsCurrent |  | 909,876 us-gaap_AssetsCurrent |  |  | 106,518 us-gaap_AssetsCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 660,897 us-gaap_AssetsCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 306,550 us-gaap_AssetsCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Non-current assets: |  |  |  |  |  |  |  |  |
Property and equipment, net | 6,620 us-gaap_PropertyPlantAndEquipmentNet | 41,075 us-gaap_PropertyPlantAndEquipmentNet |  | 36,213 us-gaap_PropertyPlantAndEquipmentNet |  |  | 5,687 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 35,283 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 28,703 us-gaap_PropertyPlantAndEquipmentNet / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Intangible assets, net | 541 us-gaap_IntangibleAssetsNetExcludingGoodwill | 3,354 us-gaap_IntangibleAssetsNetExcludingGoodwill |  | 3,377 us-gaap_IntangibleAssetsNetExcludingGoodwill |  |  | 247 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 1,535 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 1,130 us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Deposits | 1,623 us-gaap_DepositsAssetsNoncurrent | 10,071 us-gaap_DepositsAssetsNoncurrent |  | 5,939 us-gaap_DepositsAssetsNoncurrent |  |  | 1,596 us-gaap_DepositsAssetsNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 9,903 us-gaap_DepositsAssetsNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 5,771 us-gaap_DepositsAssetsNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Long-term investments | 1,072 us-gaap_LongTermInvestments | 6,652 us-gaap_LongTermInvestments |  |  |  |  | 824 us-gaap_LongTermInvestments / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 5,114 us-gaap_LongTermInvestments / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember |
Deferred tax assets, non-current | 55 us-gaap_DeferredTaxAssetsNetNoncurrent | 343 us-gaap_DeferredTaxAssetsNetNoncurrent |  | 157 us-gaap_DeferredTaxAssetsNetNoncurrent |  |  | 55 us-gaap_DeferredTaxAssetsNetNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 343 us-gaap_DeferredTaxAssetsNetNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 157 us-gaap_DeferredTaxAssetsNetNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Other non-current assets | 289 us-gaap_OtherAssetsNoncurrent | 1,794 us-gaap_OtherAssetsNoncurrent |  | 2,738 us-gaap_OtherAssetsNoncurrent |  |  | 289 us-gaap_OtherAssetsNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 1,794 us-gaap_OtherAssetsNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 2,738 us-gaap_OtherAssetsNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Total non-current assets | 10,200 us-gaap_AssetsNoncurrent | 63,289 us-gaap_AssetsNoncurrent |  | 48,424 us-gaap_AssetsNoncurrent |  |  | 8,698 us-gaap_AssetsNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 53,972 us-gaap_AssetsNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 38,499 us-gaap_AssetsNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
TOTAL ASSETS | 212,694 us-gaap_Assets | 1,319,692 us-gaap_Assets |  | 958,300 us-gaap_Assets |  |  | 115,216 us-gaap_Assets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 714,869 us-gaap_Assets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 345,049 us-gaap_Assets / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Current liabilities: |  |  |  |  |  |  |  |  |
Short-term loans |  |  |  | 12,802 us-gaap_ShortTermBorrowings |  |  |  |  | 12,802 us-gaap_ShortTermBorrowings / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Amounts due to intergroup companies |  |  |  |  |  |  | 22,702 wbai_AmountsDueToIntergroupCompanies / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 140,856 wbai_AmountsDueToIntergroupCompanies / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 3,470 wbai_AmountsDueToIntergroupCompanies / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Accrued payroll and welfare payable | 4,936 us-gaap_EmployeeRelatedLiabilitiesCurrent | 30,634 us-gaap_EmployeeRelatedLiabilitiesCurrent |  | 13,012 us-gaap_EmployeeRelatedLiabilitiesCurrent |  |  | 4,002 us-gaap_EmployeeRelatedLiabilitiesCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 24,828 us-gaap_EmployeeRelatedLiabilitiesCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 8,336 us-gaap_EmployeeRelatedLiabilitiesCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Accrued expenses and other current liabilities | 19,016 us-gaap_AccruedLiabilitiesAndOtherLiabilities | 117,992 us-gaap_AccruedLiabilitiesAndOtherLiabilities |  | 88,246 us-gaap_AccruedLiabilitiesAndOtherLiabilities |  |  | 16,176 us-gaap_AccruedLiabilitiesAndOtherLiabilities / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 100,367 us-gaap_AccruedLiabilitiesAndOtherLiabilities / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 72,857 us-gaap_AccruedLiabilitiesAndOtherLiabilities / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Income taxes payable | 1,491 us-gaap_AccruedIncomeTaxesCurrent | 9,250 us-gaap_AccruedIncomeTaxesCurrent |  | 4,507 us-gaap_AccruedIncomeTaxesCurrent |  |  | 754 us-gaap_AccruedIncomeTaxesCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 4,680 us-gaap_AccruedIncomeTaxesCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 1,863 us-gaap_AccruedIncomeTaxesCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Total current liabilities | 25,443 us-gaap_LiabilitiesCurrent | 157,876 us-gaap_LiabilitiesCurrent |  | 118,567 us-gaap_LiabilitiesCurrent |  |  | 43,634 us-gaap_LiabilitiesCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 270,731 us-gaap_LiabilitiesCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 99,328 us-gaap_LiabilitiesCurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Non-current liabilities: |  |  |  |  |  |  |  |  |
Long-term payables | 7,123 us-gaap_LongTermDebtNoncurrent | 44,194 us-gaap_LongTermDebtNoncurrent |  | 30,313 us-gaap_LongTermDebtNoncurrent |  |  | 6,856 us-gaap_LongTermDebtNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 42,540 us-gaap_LongTermDebtNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 29,328 us-gaap_LongTermDebtNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Total non-current liabilities | 7,123 us-gaap_LiabilitiesNoncurrent | 44,194 us-gaap_LiabilitiesNoncurrent |  | 30,313 us-gaap_LiabilitiesNoncurrent |  |  | 6,856 us-gaap_LiabilitiesNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 42,540 us-gaap_LiabilitiesNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 29,328 us-gaap_LiabilitiesNoncurrent / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
TOTAL LIABILITIES | $ 32,566 us-gaap_Liabilities | 202,070 us-gaap_Liabilities |  | 148,880 us-gaap_Liabilities |  |  | $ 50,490 us-gaap_Liabilities / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 313,271 us-gaap_Liabilities / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember | 128,656 us-gaap_Liabilities / us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis = us-gaap_VariableInterestEntityPrimaryBeneficiaryMember

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- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3-4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph a(1) -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 4 -Article 5 + Details
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