| Cover | May 10, 2021 |
| Document Information [Line Items] | |
| Entity Central Index Key | 0001635282 |
| Amendment Flag | false |
| Document Type | 8-K |
| Document Period End Date | Aug. 4, 2021 |
| Entity Registrant Name | Rimini Street, Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-37397 |
| Entity Tax Identification Number | 36-4880301 |
| Entity Address, Address Line One | 3993 Howard Hughes Parkway |
| Entity Address, Address Line Two | Suite 500 |
| Entity Address, City or Town | Las Vegas |
| Entity Address, State or Province | NV |
| Entity Address, Postal Zip Code | 89169 |
| City Area Code | (702) |
| Local Phone Number | 839-9671 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Common Stock | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Common Stock, par value $0.0001 per share |
| Trading Symbol | RMNI |
| Security Exchange Name | NASDAQ |
| Public Units | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Public Units, each consisting of one share of Common Stock, $0.0001 par value, and one-half of one Warrant |
| Trading Symbol | RMNIU |
| Warrant | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Warrants, exercisable for one share of Common Stock, $0.0001 par value |
| Trading Symbol | RMNIW |
