Related Parties	9 Months Ended
Sep. 30, 2012
RELATED PARTIES [Abstract]
Related Parties	13. RELATED PARTIES Marketing Services During 2011, the Company engaged InnerWorkings, Inc. (“InnerWorkings”) to provide marketing services. The Company's Executive Chairman, Eric Lefkofsky, is a former director and significant stockholder of InnerWorkings. Amounts paid in advance to InnerWorkings for services which had not yet been rendered as of September 30, 2012 totaled $1.3 million and were recorded in “Prepaid expenses and other current assets” on the condensed consolidated balance sheet. Logistics Services In connection with the Company's expansion of Goods offerings during 2012, the Company entered into a transportation and supply chain management agreement with Echo Global Logistics, Inc. ("Echo"). Three of the Company's directors, Peter Barris, Eric Lefkofsky and Bradley Keywell, either are currently or were previously in 2012 directors of Echo and have direct and/or indirect ownership interests in Echo. Pursuant to the agreement, Echo provided services either related to carrier rate negotiation and management, shipping origin and destination coordination, inventory facility set-up and management and supply chain cost analysis. Echo received payments of approximately $1.9 million for its services under the agreement for the nine months ended September 30, 2012, which were expensed by the Company through "Cost of revenue" on the condensed consolidated statements of operations. As the Goods category has expanded, the Company has hired other outside vendors for logistics services and as of September 30, 2012, the Company has terminated its arrangement with Echo.

Related Parties

9 Months Ended

Sep. 30, 2012

13. RELATED PARTIES

Marketing Services

During 2011, the Company engaged InnerWorkings, Inc. (“InnerWorkings”) to provide marketing services. The Company's Executive Chairman, Eric Lefkofsky, is a former director and significant stockholder of InnerWorkings. Amounts paid in advance to InnerWorkings for services which had not yet been rendered as of September 30, 2012 totaled $1.3 million and were recorded in “Prepaid expenses and other current assets” on the condensed consolidated balance sheet.

Logistics Services

In connection with the Company's expansion of Goods offerings during 2012, the Company entered into a transportation and supply chain management agreement with Echo Global Logistics, Inc. ("Echo"). Three of the Company's directors, Peter Barris, Eric Lefkofsky and Bradley Keywell, either are currently or were previously in 2012 directors of Echo and have direct and/or indirect ownership interests in Echo. Pursuant to the agreement, Echo provided services either related to carrier rate negotiation and management, shipping origin and destination coordination, inventory facility set-up and management and supply chain cost analysis. Echo received payments of approximately $1.9 million for its services under the agreement for the nine months ended September 30, 2012, which were expensed by the Company through "Cost of revenue" on the condensed consolidated statements of operations. As the Goods category has expanded, the Company has hired other outside vendors for logistics services and as of September 30, 2012, the Company has terminated its arrangement with Echo.