| Document and Entity Information | Dec. 01, 2020 |
| Cover [Abstract] | |
| Entity Registrant Name | LIVEPERSON INC |
| Amendment Flag | true |
| Entity Central Index Key | 0001102993 |
| Document Type | 8-K/A |
| Document Period End Date | Dec. 1, 2020 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 0-30141 |
| Entity Tax Identification Number | 13-3861628 |
| Entity Address, Address Line One | 475 Tenth Avenue |
| Entity Address, Address Line Two | 5th Floor |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10018 |
| City Area Code | (212) |
| Local Phone Number | 609-4200 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, par value $0.001 per share |
| Trading Symbol | LPSN |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Amendment Description | LivePerson, Inc. is filing this Amendment (this “Amendment”) to the Form 8-K filed on December 7, 2020 (the “Original Form 8-K”) solely to amend Item 9.01 of the Original Form 8-K to replace Exhibits 4.1, 4.2, 10.1 and 10.2 in the Original Form 8-K, which contained incorrect formatting and section references. |
