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PREPAYMENTS, OTHER CURRENT ASSETS AND DEPOSITS (Summary of Prepayments and Other Current Assets) (Details) In Thousands, unless otherwise specified | Dec. 31, 2014 USD ($) | Dec. 31, 2014 CNY | Dec. 31, 2013 CNY
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PREPAYMENTS, OTHER CURRENT ASSETS AND DEPOSITS [Abstract] |  |  |  |  |  |
Prepayments | $ 60 us-gaap_PrepaidExpenseCurrent |  | 371 us-gaap_PrepaidExpenseCurrent |  | 824 us-gaap_PrepaidExpenseCurrent |
Deposits for future lottery ticket purchase | 14,411 us-gaap_OtherRestrictedAssetsCurrent | [1] | 89,417 us-gaap_OtherRestrictedAssetsCurrent | [1] | 55,911 us-gaap_OtherRestrictedAssetsCurrent | [1]
Receivables from third party payment service providers | 2,854 us-gaap_PremiumsAndOtherReceivablesNet |  | 17,705 us-gaap_PremiumsAndOtherReceivablesNet |  | 12,416 us-gaap_PremiumsAndOtherReceivablesNet |
Receivables from lottery administration centers for winnings | 443 us-gaap_DueFromAffiliateCurrent |  | 2,749 us-gaap_DueFromAffiliateCurrent |  | 15,880 us-gaap_DueFromAffiliateCurrent |
Interest receivables | 1,038 us-gaap_InterestReceivableCurrent |  | 6,441 us-gaap_InterestReceivableCurrent |  |  |
Deposit for business acquisition | 3,223 wbai_DepositForAcquisitionNegotiationCurrent | [2] | 20,000 wbai_DepositForAcquisitionNegotiationCurrent | [2] |  | [2]
Deferred sponsorship and advertising expenses | 1,664 us-gaap_DeferredCostsCurrent |  | 10,324 us-gaap_DeferredCostsCurrent |  | 1,757 us-gaap_DeferredCostsCurrent |
Others | 1,754 us-gaap_OtherAssetsCurrent |  | 10,880 us-gaap_OtherAssetsCurrent |  | 7,485 us-gaap_OtherAssetsCurrent |
Prepayments and other current assets, Total | $ 25,447 us-gaap_PrepaidExpenseAndOtherAssetsCurrent |  | 157,887 us-gaap_PrepaidExpenseAndOtherAssetsCurrent |  | 94,273 us-gaap_PrepaidExpenseAndOtherAssetsCurrent |
[1] | Deposits for future lottery ticket purchase represent cash paid in advance by the Group to lottery administration centers for the purchase of lottery tickets.
[2] | Deposit for business acquisition represents cash paid in advance by the Group for a potential business acquisition. The deposit was subsequently returned to the Group in January 2015, as the deal was cancelled.

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