Legal Matters	6 Months Ended
Legal Matters	Jun. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Legal Matters	Legal Matters The Company previously filed an intellectual property suit against [24]7 Customer, Inc. (‘‘[24]7’’) in the Southern District of New York on March 6, 2014 seeking damages on the grounds that [24]7 reverse engineered and misappropriated the Company’s technology to develop competing products and misused the Company’s business information. On June 22, 2015, [24]7 Customer, Inc. filed suit against the Company in the Northern District of California alleging patent infringement. On December 7, 2015, [24]7 Customer Inc. filed a second patent infringement suit against the Company, also in the Northern District of California. On March 16, 2017, the New York case was voluntarily transferred and consolidated with the two California cases in the Northern District of California for all pre-trial purposes. Rulings by both the Court and the United States Patent Office in the Company’s favor have invalidated the majority of [24]7 patents that were asserted in the patent cases. Trial for the Company’s intellectual property and other claims asserted against [24]7 in the original litigation was set for April 27, 2020, but that date was vacated due to court restrictions related to COVID-19 and will be reset once those restrictions are lifted. Trial for [24]7’s patent infringement claims has been vacated, to be reset after the trial on LivePerson’s claims. The Company believes the claims filed by [24]7 are entirely without merit and intends to defend them vigorously. The Company routinely assesses all of its litigation and threatened litigation as to the probability of ultimately incurring a liability, and records its best estimate of the ultimate loss in situations where the Company assesses the likelihood of loss as probable. From time to time, the Company is involved in or subject to legal, administrative and regulatory proceedings, claims, demands and investigations arising in the ordinary course of business, including direct claims brought by or against the Company with respect to intellectual property, contracts, employment and other matters, as well as claims brought against the Company’s customers for whom the Company has a contractual indemnification obligation. The Company accrues for a liability when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated. Significant judgment is required in both the determination of probability and the determination as to whether a loss is reasonably estimable. In addition, in the event the Company determines that a loss is not probable, but is reasonably possible, and it becomes possible to develop what the Company believes to be a reasonable range of possible loss, then the Company will include disclosure related to such matter as appropriate and in compliance with ASC 450. The accruals or estimates, if any, resulting from the foregoing analysis, are reviewed at least quarterly and adjusted to reflect the impact of negotiations, settlements, rulings, advice of legal counsel and other information and events pertaining to a particular matter. To the extent there is a reasonable possibility that the losses could exceed the amounts already accrued, the Company will, as applicable, adjust the accrual in the period the determination is made, disclose an estimate of the additional loss or range of loss, indicate that the estimate is immaterial with respect to its financial statements as a whole or, if the amount of such adjustment cannot be reasonably estimated, disclose that an estimate cannot be made. From time to time, third parties assert claims against the Company regarding intellectual property rights, privacy issues and other matters arising in the ordinary course of business. Although the Company cannot be certain of the outcome of any litigation or the disposition of any claims, nor the amount of damages and exposure, if any, that the Company could incur, the Company currently believes that the final disposition of all existing matters will not have a material adverse effect on our business, results of operations, financial condition or cash flows. In addition, in the ordinary course of business, the Company is also subject to periodic threats of lawsuits, investigations and claims. Regardless of the outcome, litigation can have an adverse impact on the Company because of defense and settlement costs, diversion of management resources and other factors. 15. Income Taxes Income taxes are accounted for under the asset and liability method. Under this method, deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences are expected to become deductible. In evaluating our ability to recover our deferred tax assets in the jurisdiction from which they arise, we consider all available positive and negative evidence, including scheduled reversals of deferred tax liabilities, projected future taxable income, tax-planning strategies, and results of recent operations. We include interest accrued on the underpayment of income taxes in interest expense and penalties, if any, related to unrecognized tax benefits in general and administrative expenses. We recorded a valuation allowance as we considered our cumulative loss in recent years as a significant piece of negative evidence. Valuation allowances are established, when necessary, to reduce deferred tax assets to the amount expected to be realized. On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security (CARES) Act was signed into law making several changes to the Internal Revenue Code. The changes include, but are not limited to: increasing the limitation on the amount of deductible interest expense; allowing companies to carryback certain net operating losses; and increasing the amount of net operating loss carryforwards that corporations can use to offset taxable income. Under the CARES Act, the Company is able to recognize the benefit of the tax year 2018 loss by carrying back the loss to prior periods. There was no tax benefit recognized for the three months ended June 30, 2020. The total tax benefit recognized in the Company’s condensed consolidated statement of operations for the six months ended June 30, 2020 as a result of the CARES Act is approximately $0.6 million. 16. Subsequent Events In response to the coronavirus pandemic, we have undertaken a re-evaluation of our real estate needs. In connection with this re-evaluation, and the success we have had working remotely for the past several months, it is likely that we will significantly reduce or eliminate the real estate space we lease. This will result in the derecognition of the associated ROU assets and lease liabilities and may also result in impairment charges to other assets such as property and equipment located at these leased office locations. Furthermore, this will likely result in various one-time cash expenses in connection with early termination of some or all of our leases that could be material to our financial position and results of operations. As the Company is still actively assessing its global lease portfolio, management is not able to estimate the financial effect of this transition to an employee-centric model.