Description of Business and Basis of Presentation	6 Months Ended
Jun. 30, 2016
Accounting Policies [Abstract]
Description of Business and Basis of Presentation	Description of Business and Basis of Presentation LivePerson, Inc. (the “Company” or “LivePerson”) was incorporated in the State of Delaware in November 1995 and the LivePerson service was introduced in November 1998. In April 2000, the Company completed an initial public offering and is currently traded on the Nasdaq Global Select Market and the Tel Aviv Stock Exchange. LivePerson is headquartered in New York City, with U.S. offices in Alpharetta (Georgia) and international offices in Amsterdam, Berlin, London, Mannheim, Melbourne, Milan, Paris, Ra'anana (Israel), Reading (UK), and Tokyo. LivePerson provides mobile and online messaging technologies that power digital communication between brands and consumers. LiveEngage, the Company’s enterprise-class, cloud-based platform, enables businesses to create a meaningful connection with consumers by offering messaging as a preferred channel of communication. Messaging diminishes the need to rely on email systems or call a 1-800 number. Brands leverage LivePerson’s sophisticated intelligence engine and suite of text and mobile messaging, real-time chat messaging, content delivery, and cobrowsing offerings to proactively engage with consumers through m-dot sites, mobile apps, the desktop, social media and third-party consumer messaging platforms. The Company’s campaign-based messaging enables the brand to target the right consumer at the right time on a brand’s site by leveraging proprietary analysis and data-driven intelligence. The data the Company gathers and analyzes, on behalf of its customers, spans the breadth of an online or mobile visitor session, starting from an initial keyword search or application login, through actions on the website or mobile application of the Company’s customer, and even into a shopping cart and an executed sale. The Company combines this session data with other historical, behavioral and operational information to develop insights into each step of a consumer’s journey for sales and service transactions. These unique, industry- and use-case specific insights are mapped to each brand’s business goals in order to deliver successful campaign outcomes. LivePerson’s products, coupled with its domain knowledge, industry expertise and consulting services, have been proven to maximize the effectiveness of consumer engagement. The Company’s primary revenue source is from the sale of LivePerson services to businesses of all sizes. The Company also offers an online marketplace that connects independent service providers (“Experts”) who provide information and knowledge for a fee via mobile and online messaging with individual consumers (“Users”). Basis of Presentation The accompanying condensed consolidated financial statements as of June 30, 2016 and for the three and six months ended June 30, 2016 and 2015 are unaudited. In the opinion of management, the unaudited condensed consolidated financial statements have been prepared on the same basis as the annual financial statements and reflect all adjustments, which include only normal recurring adjustments, necessary to present fairly the consolidated financial position of LivePerson as of June 30, 2016, and the consolidated results of operations, comprehensive loss and cash flows for the interim periods ended June 30, 2016 and 2015. The financial data and other information disclosed in these notes to the condensed consolidated financial statements related to these periods are unaudited. The results of operations for any interim period are not necessarily indicative of the results of operations for any other future interim period or for a full fiscal year. The condensed consolidated balance sheet at December 31, 2015 has been derived from audited consolidated financial statements at that date. Certain information and note disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). These unaudited interim condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto for the year ended December 31, 2015, included in the Company’s Annual Report on Form 10-K filed with the SEC on March 15, 2016. Principles of Consolidation The condensed consolidated financial statements include the Company and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated. Reclassification For comparability, certain 2015 amounts have been reclassified, where appropriate, to conform to the financial presentation in 2016. The Company reclassified $0.2 million related to the fair value adjustment of the contingent earn-out for Engage Pty Ltd. (“Engage”) from cost of revenue to general and administrative expenses. Use of Estimates The preparation of the Company’s condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of income and expenses during the reporting period. These estimates are based on information available as of the date of the condensed consolidated financial statements; therefore, actual results could differ from management’s estimates. Recently Issued Accounting Standards In November 2015, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2015-17, “Income taxes: Balance Sheet Classification of Deferred Taxes Business” (“ASU 2015-17”). Topic 740, Income Taxes, requires an entity to separate deferred income tax liabilities and assets into current and noncurrent amounts in a classified statement of financial position. Deferred tax liabilities and assets are classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. Deferred tax liabilities and assets that are not related to an asset or liability for financial reporting are classified according to the expected reversal date of the temporary difference. To simplify the presentation of deferred income taxes, ASU 2015-17 requires that deferred income tax liabilities and assets be classified as noncurrent in a classified statement of financial position. ASU 2015-17 is effective for financial statements issued for annual periods beginning after December 15, 2016, and interim periods within those annual periods. The Company has elected to early adopt ASU 2015-17 on its financial statements effective June 30, 2016 on a prospective basis. In September 2015, FASB issued Accounting Standards Update No. 2015-16, “Business Combinations: Simplifying the Accounting for Measurement-Period Adjustments” (“ASU 2015-16”). ASU 2015-16 requires that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. The amendments in ASU 2015-16 require that the acquirer record, in the same period’s financial statements, the effect on earnings of changes in depreciation, amortization, or other income effects, if any, as a result of the change to the provisional amounts, calculated as if the accounting had been completed at the acquisition date. ASU 2015-16 is effective for annual reporting periods beginning after December 15, 2015. This standard became effective for the Company in the first quarter of 2016, and is applied on a prospective basis to adjustments to provisional amounts that occur after the effective date with no material impact to its financial statements. In February 2015, FASB issued Accounting Standards Update No. 2015-02, Consolidation: Amendments to the Consolidation Analysis (“ASU 2015-02”), which affects reporting entities that are required to evaluate whether they should consolidate certain legal entities. All legal entities are subject to reevaluation under the revised consolidation model. The standard amends the consolidation requirements in ASC 810. ASU 2015-02 is effective for fiscal periods beginning after December 15, 2015 for public companies, and early adoption is permitted. The Company adopted this standard during the first quarter of 2016 and there was no material impact of this on its financial statements. In May 2014, FASB issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”), which supersedes most existing revenue recognition guidance under GAAP. The core principle of ASU 2014-09 is to recognize revenues when promised goods or services are transferred to customers in an amount that reflects the consideration to which an entity expects to be entitled for those goods or services. ASU 2014-09 defines a five step process to achieve this core principle and, in doing so, more judgment and estimates may be required within the revenue recognition process than are required under existing GAAP. The standard is effective for annual periods beginning after December 15, 2017, and interim periods therein, using either of the following transition methods: (i) a full retrospective approach reflecting the application of the standard in each prior reporting period with the option to elect certain practical expedients, or (ii) a retrospective approach with the cumulative effect of initially adopting ASU 2014-09 recognized at the date of adoption (which includes additional footnote disclosures). In March 2016, the FASB issued implementation guidance that clarified the considerations in principal versus agent determination. In April 2016, the FASB issued guidance that clarified identifying performance obligations and licensing implementation guidance contained in the new revenue recognition standard. In May 2016, FASB issued guidance that addresses narrow-scope improvements to the guidance on collectability, noncash consideration, and completed contracts at transition. The Company will adopt this guidance at the beginning of its first quarter of fiscal year 2018. Adoption of this guidance is not expected to have a material impact on the Company’s financial statements.

Description of Business and Basis of Presentation

LivePerson, Inc. (the “Company” or “LivePerson”) was incorporated in the State of Delaware in November 1995 and the LivePerson service was introduced in November 1998. In April 2000, the Company completed an initial public offering and is currently traded on the Nasdaq Global Select Market and the Tel Aviv Stock Exchange. LivePerson is headquartered in New York City, with U.S. offices in Alpharetta (Georgia) and international offices in Amsterdam, Berlin, London, Mannheim, Melbourne, Milan, Paris, Ra'anana (Israel), Reading (UK), and Tokyo.

LivePerson provides mobile and online messaging technologies that power digital communication between brands and consumers. LiveEngage, the Company’s enterprise-class, cloud-based platform, enables businesses to create a meaningful connection with consumers by offering messaging as a preferred channel of communication. Messaging diminishes the need to rely on email systems or call a 1-800 number. Brands leverage LivePerson’s sophisticated intelligence engine and suite of text and mobile messaging, real-time chat messaging, content delivery, and cobrowsing offerings to proactively engage with consumers through m-dot sites, mobile apps, the desktop, social media and third-party consumer messaging platforms. The Company’s campaign-based messaging enables the brand to target the right consumer at the right time on a brand’s site by leveraging proprietary analysis and data-driven intelligence.

The data the Company gathers and analyzes, on behalf of its customers, spans the breadth of an online or mobile visitor session, starting from an initial keyword search or application login, through actions on the website or mobile application of the Company’s customer, and even into a shopping cart and an executed sale. The Company combines this session data with other historical, behavioral and operational information to develop insights into each step of a consumer’s journey for sales and service transactions. These unique, industry- and use-case specific insights are mapped to each brand’s business goals in order to deliver successful campaign outcomes. LivePerson’s products, coupled with its domain knowledge, industry expertise and consulting services, have been proven to maximize the effectiveness of consumer engagement.

The Company’s primary revenue source is from the sale of LivePerson services to businesses of all sizes. The Company also offers an online marketplace that connects independent service providers (“Experts”) who provide information and knowledge for a fee via mobile and online messaging with individual consumers (“Users”).

Basis of Presentation

The accompanying condensed consolidated financial statements as of June 30, 2016 and for the three and six months ended June 30, 2016 and 2015 are unaudited. In the opinion of management, the unaudited condensed consolidated financial statements have been prepared on the same basis as the annual financial statements and reflect all adjustments, which include only normal recurring adjustments, necessary to present fairly the consolidated financial position of LivePerson as of June 30, 2016, and the consolidated results of operations, comprehensive loss and cash flows for the interim periods ended June 30, 2016 and 2015. The financial data and other information disclosed in these notes to the condensed consolidated financial statements related to these periods are unaudited. The results of operations for any interim period are not necessarily indicative of the results of operations for any other future interim period or for a full fiscal year. The condensed consolidated balance sheet at December 31, 2015 has been derived from audited consolidated financial statements at that date.

Certain information and note disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). These unaudited interim condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements and notes thereto for the year ended December 31, 2015, included in the Company’s Annual Report on Form 10-K filed with the SEC on March 15, 2016.

Principles of Consolidation

The condensed consolidated financial statements include the Company and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated.

Reclassification

For comparability, certain 2015 amounts have been reclassified, where appropriate, to conform to the financial presentation in 2016. The Company reclassified $0.2 million related to the fair value adjustment of the contingent earn-out for Engage Pty Ltd. (“Engage”) from cost of revenue to general and administrative expenses.

Use of Estimates

The preparation of the Company’s condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of income and expenses during the reporting period. These estimates are based on information available as of the date of the condensed consolidated financial statements; therefore, actual results could differ from management’s estimates.

Recently Issued Accounting Standards

In November 2015, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2015-17, “Income taxes: Balance Sheet Classification of Deferred Taxes Business” (“ASU 2015-17”). Topic 740, Income Taxes, requires an entity to separate deferred income tax liabilities and assets into current and noncurrent amounts in a classified statement of financial position. Deferred tax liabilities and assets are classified as current or noncurrent based on the classification of the related asset or liability for financial reporting. Deferred tax liabilities and assets that are not related to an asset or liability for financial reporting are classified according to the expected reversal date of the temporary difference. To simplify the presentation of deferred income taxes, ASU 2015-17 requires that deferred income tax liabilities and assets be classified as noncurrent in a classified statement of financial position. ASU 2015-17 is effective for financial statements issued for annual periods beginning after December 15, 2016, and interim periods within those annual periods. The Company has elected to early adopt ASU 2015-17 on its financial statements effective June 30, 2016 on a prospective basis.

In September 2015, FASB issued Accounting Standards Update No. 2015-16, “Business Combinations: Simplifying the Accounting for Measurement-Period Adjustments” (“ASU 2015-16”). ASU 2015-16 requires that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. The amendments in ASU 2015-16 require that the acquirer record, in the same period’s financial statements, the effect on earnings of changes in depreciation, amortization, or other income effects, if any, as a result of the change to the provisional amounts, calculated as if the accounting had been completed at the acquisition date. ASU 2015-16 is effective for annual reporting periods beginning after December 15, 2015. This standard became effective for the Company in the first quarter of 2016, and is applied on a prospective basis to adjustments to provisional amounts that occur after the effective date with no material impact to its financial statements.

In February 2015, FASB issued Accounting Standards Update No. 2015-02, Consolidation: Amendments to the Consolidation Analysis (“ASU 2015-02”), which affects reporting entities that are required to evaluate whether they should consolidate certain legal entities. All legal entities are subject to reevaluation under the revised consolidation model. The standard amends the consolidation requirements in ASC 810. ASU 2015-02 is effective for fiscal periods beginning after December 15, 2015 for public companies, and early adoption is permitted. The Company adopted this standard during the first quarter of 2016 and there was no material impact of this on its financial statements.

In May 2014, FASB issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”), which supersedes most existing revenue recognition guidance under GAAP. The core principle of ASU 2014-09 is to recognize revenues when promised goods or services are transferred to customers in an amount that reflects the consideration to which an entity expects to be entitled for those goods or services. ASU 2014-09 defines a five step process to achieve this core principle and, in doing so, more judgment and estimates may be required within the revenue recognition process than are required under existing GAAP. The standard is effective for annual periods beginning after December 15, 2017, and interim periods therein, using either of the following transition methods: (i) a full retrospective approach reflecting the application of the standard in each prior reporting period with the option to elect certain practical expedients, or (ii) a retrospective approach with the cumulative effect of initially adopting ASU 2014-09 recognized at the date of adoption (which includes additional footnote disclosures). In March 2016, the FASB issued implementation guidance that clarified the considerations in principal versus agent determination. In April 2016, the FASB issued guidance that clarified identifying performance obligations and licensing implementation guidance contained in the new revenue recognition standard. In May 2016, FASB issued guidance that addresses narrow-scope improvements to the guidance on collectability, noncash consideration, and completed contracts at transition. The Company will adopt this guidance at the beginning of its first quarter of fiscal year 2018. Adoption of this guidance is not expected to have a material impact on the Company’s financial statements.