| Document and Entity Information Document | Jun. 01, 2021 |
| Entity Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Jun. 1, 2021 |
| Entity Registrant Name | PROS Holdings, Inc. |
| Entity Central Index Key | 0001392972 |
| Amendment Flag | false |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-33554 |
| Entity Tax Identification Number | 76-0168604 |
| Entity Address, Address Line One | 3200 Kirby Drive, Suite 600 |
| Entity Address, City or Town | Houston |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 77098 |
| City Area Code | (713) |
| Local Phone Number | 335-5151 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock $0.001 par value per share |
| Trading Symbol | PRO |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
