Acquisitions	12 Months Ended
Dec. 31, 2011
Acquisitions	(2) Acquisitions Proficient Systems On July 18, 2006, the Company acquired Proficient Systems, Inc. (“Proficient”), a provider of hosted proactive chat solutions that help companies generate revenue on their web sites. This transaction was accounted for under the purchase method of accounting and, accordingly, the operating results of Proficient were included in the Company’s consolidated results of operations from the date of acquisition. The acquisition added several U.K. based financial services customers and provided an innovative product marketing team. During the twelve months ended December 31, 2011, 2010 and 2009, the Company incurred additional costs related to the earn-out litigation in the amount of $75, $95, $98, respectively, resulting in an increase in goodwill. See “Legal Proceedings” and Note 9 of our consolidated financial statements for additional information regarding the Proficient litigation. Based on the achievement of certain revenue targets as of March 31, 2007, LivePerson was contingently required to issue up to an additional 2,050,000 shares of common stock. Based on these targets, the Company issued 1,127,985 shares of common stock valued at $8,894, based on the quoted market price of the Company’s common stock on the date the contingency was resolved, and made a cash payment of $20 related to this contingency. At March 31, 2007, the value of these shares has been allocated to goodwill with a corresponding increase in equity. In accordance with the purchase agreement, the earn-out consideration was subject to review by Proficient’s Shareholders’ Representative. On July 31, 2007, the Company was served with a complaint filed in the United States District Court for the Southern District of New York by the Shareholders’ Representative of Proficient (“Plaintiff”). The complaint filed by the Shareholders’ Representative sought certain documentation relating to calculation of the earn-out consideration, and demanded payment of damages on the grounds that substantially all of the remaining contingently issuable earn-out shares should have been paid. The Company believes the claims are without merit. The case proceeded to trial, which ended on November 4, 2010. Post-trial filings were made on November 19, 2010. The Court has still not issued its ruling in this case. In the event that the Court finds in whole or in part for Plaintiff, the Company would be required to pay monetary damages in the amount held by the Court to have been underpaid in the earn-out. The Company is presently unable to reasonably estimate the amount of actual damages, if any, that will be awarded by the Court. If the Court were to find in favor of Plaintiff on every claim at issue in the litigation, the maximum potential damages award would be approximately $6,000. Should the Company be required to pay any damages award, the associated expense would be allocated to goodwill in connection with Proficient acquisition. NuConomy Ltd. On April 13, 2010, the Company acquired all of the outstanding shares of NuConomy Ltd. (“NuConomy”), an Israeli-based development-stage company whose web analytics and optimization platform is intended to help companies better assess and understand website and social marketing performance, in exchange for aggregate cash consideration of $800. This transaction was accounted for as an asset purchase. The net asset was allocated to “Intangibles, net.”

Acquisitions

12 Months Ended

Dec. 31, 2011

(2) Acquisitions

Proficient Systems

On July 18, 2006, the Company acquired Proficient Systems, Inc. (“Proficient”), a provider of hosted proactive chat solutions that help companies generate revenue on their web sites. This transaction was accounted for under the purchase method of accounting and, accordingly, the operating results of Proficient were included in the Company’s consolidated results of operations from the date of acquisition. The acquisition added several U.K. based financial services customers and provided an innovative product marketing team. During the twelve months ended December 31, 2011, 2010 and 2009, the Company incurred additional costs related to the earn-out litigation in the amount of $75, $95, $98, respectively, resulting in an increase in goodwill. See “Legal Proceedings” and Note 9 of our consolidated financial statements for additional information regarding the Proficient litigation.

Based on the achievement of certain revenue targets as of March 31, 2007, LivePerson was contingently required to issue up to an additional 2,050,000 shares of common stock. Based on these targets, the Company issued 1,127,985 shares of common stock valued at $8,894, based on the quoted market price of the Company’s common stock on the date the contingency was resolved, and made a cash payment of $20 related to this contingency. At March 31, 2007, the value of these shares has been allocated to goodwill with a corresponding increase in equity. In accordance with the purchase agreement, the earn-out consideration was subject to review by Proficient’s Shareholders’ Representative. On July 31, 2007, the Company was served with a complaint filed in the United States District Court for the Southern District of New York by the Shareholders’ Representative of Proficient (“Plaintiff”). The complaint filed by the Shareholders’ Representative sought certain documentation relating to calculation of the earn-out consideration, and demanded payment of damages on the grounds that substantially all of the remaining contingently issuable earn-out shares should have been paid. The Company believes the claims are without merit. The case proceeded to trial, which ended on November 4, 2010. Post-trial filings were made on November 19, 2010. The Court has still not issued its ruling in this case. In the event that the Court finds in whole or in part for Plaintiff, the Company would be required to pay monetary damages in the amount held by the Court to have been underpaid in the earn-out. The Company is presently unable to reasonably estimate the amount of actual damages, if any, that will be awarded by the Court. If the Court were to find in favor of Plaintiff on every claim at issue in the litigation, the maximum potential damages award would be approximately $6,000. Should the Company be required to pay any damages award, the associated expense would be allocated to goodwill in connection with Proficient acquisition.

NuConomy Ltd.

On April 13, 2010, the Company acquired all of the outstanding shares of NuConomy Ltd. (“NuConomy”), an Israeli-based development-stage company whose web analytics and optimization platform is intended to help companies better assess and understand website and social marketing performance, in exchange for aggregate cash consideration of $800. This transaction was accounted for as an asset purchase. The net asset was allocated to “Intangibles, net.”