| Cover | Dec. 02, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Dec. 2, 2020 |
| Entity Registrant Name | LivePerson, Inc. |
| Entity Central Index Key | 0001102993 |
| Amendment Flag | false |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 0-30141 |
| Entity Tax Identification Number | 13-3861628 |
| Entity Address, Address Line One | 475 Tenth Avenue, 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 |
| Entity Emerging Growth Company | false |
| Title of 12(b) Security | Common Stock, par value $0.001 per share |
| Trading Symbol | LPSN |
| Security Exchange Name | NASDAQ |
