| Cover | Mar. 02, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K/A |
| Document Period End Date | Mar. 2, 2021 |
| Entity Registrant Name | UPLAND SOFTWARE, INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-36720 |
| Entity Tax Identification Number | 27-2992077 |
| Entity Address, Address Line One | 401 Congress Avenue, Suite 1850 |
| Entity Address, City or Town | Austin |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 78701 |
| City Area Code | 512 |
| Local Phone Number | 960-1010 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.0001 per share |
| Trading Symbol | UPLD |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001505155 |
| Amendment Flag | true |
| Amendment Description | The purpose of this filing is solely to correct the EDGAR submission header on the Form 8-K of Upland Software, Inc., previously filed on March 2, 2021 (the “Original Filing”), to include a reference to Item 5.02. There were no changes to the text or accompanying exhibits of the Original Filing. |
