| Document and Entity Information | Nov. 08, 2019 |
| Cover [Abstract] | |
| Entity Address, State or Province | CO |
| Amendment Flag | false |
| Entity Central Index Key | 0001310114 |
| Document Type | 8-K |
| Document Period End Date | Nov. 8, 2019 |
| Entity Registrant Name | ServiceSource International, Inc. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-35108 |
| Entity Tax Identification Number | 81-0578975 |
| Entity Address, Address Line One | 707 17th Street |
| Entity Address, Address Line Two | 25th Floor |
| Entity Address, City or Town | Denver |
| Entity Address, Postal Zip Code | 80202 |
| City Area Code | (720) |
| Local Phone Number | 889-8500 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, par value $0.0001 per share |
| Trading Symbol | SREV |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
