LIQUIDITY AND SIGNIFICANT ACCOUNTING POLICIES (Policies)	9 Months Ended
	Sep. 30, 2021
Accounting Policies [Abstract]
Nature of Business	Nature of Business Rimini Street, Inc. (the “Company”) is a global provider of enterprise software support services. The Company’s subscription-based software support products and services offer enterprise software licensees a choice of solutions that replace or supplement the support products and services offered by enterprise software vendors.
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation The unaudited condensed consolidated financial statements, which include the accounts of the Company and its wholly-owned subsidiaries, are prepared in conformity with generally accepted accounting principles in the United States of America (“U.S. GAAP”). All significant intercompany balances and transactions have been eliminated. The accompanying unaudited condensed consolidated financial statements have been prepared by the Company pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”) regarding interim financial reporting. Accordingly, certain information and footnote disclosures required by U.S. GAAP for complete financial statements have been condensed or omitted in accordance with such rules and regulations. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation of the unaudited condensed consolidated financial statements have been included. These unaudited condensed consolidated financial statements should be read in conjunction with the Company’s audited consolidated financial statements for the year ended December 31, 2020, included in the Company’s 2020 Annual Report on Form 10-K as filed with the SEC on March 3, 2021 and as subsequently amended on May 10, 2021 (as amended, the “2020 Form 10-K/A”). The accompanying condensed consolidated balance sheet and related disclosures as of December 31, 2020 have been derived from the Company’s audited financial statements. The Company’s financial condition as of September 30, 2021, and operating results for the three months ended September 30, 2021, are not necessarily indicative of the financial condition and results of operations that may be expected for any future interim period or for the year ending December 31, 2021.
Use of Estimates	Use of Estimates The preparation of financial statements and related disclosures in conformity with U.S. GAAP requires the Company to make judgments, assumptions, and estimates that affect the amounts reported in its consolidated financial statements and accompanying notes. The Company bases its estimates and assumptions on current facts, historical experience, and various other factors that it believes are reasonable under the circumstances to determine the carrying values of assets and liabilities that are not readily apparent from other sources. The Company’s significant accounting estimates include, but are not necessarily limited to, accounts receivable, valuation assumptions for stock options and leases, deferred income taxes and the related valuation allowances, and the evaluation and measurement of contingencies. To the extent there are material differences between the Company’s estimates and actual results, the Company’s future consolidated results of operation may be affected.
Recent Accounting Pronouncements	Recent Accounting Pronouncements Recently Adopted Standards. The following accounting standards were adopted during the fiscal year 2021: In December 2019, the Financial Accounting Standards Board (“FASB”) issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. The guidance removes certain exceptions to the general income tax accounting principles, and clarifies and amends existing guidance to facilitate consistent application of the accounting principles. The new guidance was effective for the Company as of January 1, 2021. The adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements. In January 2020, the FASB issued ASU 2020-1, Investments—Equity Securities (Topic 321), Investments - Equity and Joint Ventures (Topic 323), and Derivatives and Hedging (Topic 815). The guidance clarifies interactions between current accounting standards on equity securities, equity method and joint ventures, and derivatives and hedging. The new guidance addresses accounting for the transition into and out of the equity method and measuring certain purchased options and forward contracts to acquire investments. The new guidance was effective for the Company as of January 1, 2021. The adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements.
Earnings Per Share	The Company computes earnings per share in accordance with ASC Topic 260, Earnings per Share, which requires earnings per share for each class of stock to be calculated using the two-class method. The holders of Series A Preferred Stock were entitled to participate in Common Stock dividends, if and when declared, on a one-to-one per-share basis. Accordingly, in periods in which the Company has net income, earnings per share will be computed using the two-class method whereby the pro rata dividends on Common Stock that are also distributable to the holders of Series A Preferred Stock would have been deducted from earnings applicable to common stockholders, regardless of whether a dividend is declared for such undistributed earnings. Under the two-class method, earnings for the reporting period were allocated between the holders of the Company’s Common Stock and the Series A Preferred Stock based on their respective participation rights in undistributed earnings. Basic earnings per share of Common Stock is computed by dividing net income attributable to common stockholders by the weighted average number of shares of basic Common Stock outstanding. Net income allocated to the holders of the Company’s Series A Preferred Stock is calculated based on the shareholders’ proportionate share of the weighted average shares of Common Stock outstanding on an if-converted basis. Diluted earnings per share of Common Stock is calculated by adjusting the basic earnings per share of Common Stock for the effects of potential dilutive Common Stock shares outstanding such as stock options, restricted stock units and warrants.