Cover - shares	9 Months Ended
	Sep. 30, 2022	Oct. 31, 2022
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2022
Document Transition Report	false
Entity File Number	001-37397
Entity Registrant Name	Rimini Street, Inc.
Entity Incorporation, State or Country Code	DE
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
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		88,278,000
Amendment Flag	false
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
Entity Central Index Key	0001635282
Current Fiscal Year End Date	--12-31
Common Stock, par value $0.0001 per share
Document Information [Line Items]
Title of 12(b) Security	Common Stock, par value $0.0001 per share
Trading Symbol	RMNI
Security Exchange Name	NASDAQ