Description of Business	9 Months Ended
Description of Business	Sep. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	Description of Business Gemini Space Station, Inc., (the "Corporation", “Company”, “Gemini”, or “Space Station”) a Nevada corporation, was formed on February 4, 2025 with a fiscal year end of December 31. Pursuant to a reorganization, the Corporation is a holding company, and its principal asset is a controlling equity interest in Gemini Space Station, LLC (“GSS, LLC”), a related party. The Corporation is the sole managing member of GSS, LLC and controls all of the businesses and affairs of GSS, LLC. The Company offers a mobile and web based crypto asset exchange platform, proprietary wallet infrastructure and custody solutions, high-performance over-the-counter trading solutions tailored to institutions and professionals, a digital art auction platform, a proprietary United States dollar-backed stablecoin, a crypto asset staking service and a credit card product that offers crypto asset rewards on customer purchases. The Company operates globally and provides security solutions across all of its product offerings. Certain subsidiaries are regulated and/or indirectly impacted by various state, federal and self-regulatory organizational governing bodies such as the New York State Department of Financial Services ("NYSDFS") and the Financial Industry Regulatory Authority ("FINRA"). Initial Public Offering and Concurrent Private Placement In September 2025, the Company completed its initial public offering (“IPO”), in which the Company issued and sold 15.9 million shares of its Class A common stock at a public offering price of $28.00 per share, which includes the exercise in full by the underwriters of their option to purchase from the Company an additional 0.3 million shares of the Company’s Class A common stock and 0.5 million shares of the Company’s Class A common stock from the selling stockholders. The sale of shares by the selling stockholders did not result in any proceeds to the Company. Net proceeds from the IPO were $406.3 million after deducting the underwriting discounts and commissions and before deducting offering costs of $15.2 million. Deferred, direct offering costs were capitalized and consisted of fees and expenses incurred in connection with the sale of the Company's common stock in the IPO, including legal, accounting, printing and other offering related costs. Upon completion of the IPO, these deferred offering costs were reclassified from current assets to stockholders’ equity and recorded against the net proceeds from the offering. Concurrent with the IPO, Nasdaq, Inc. ("Nasdaq") entered into an agreement with the Company to purchase 1.9 million shares of Class A common stock in a private placement at $26.25 per share. The gross proceeds to the Company from the concurrent private placement were $50.0 million. In connection with the completion of the IPO, the Company filed its Amended and Restated Articles of Incorporation effective September 15, 2025 (the “Articles of Incorporation”), which authorized a total of 1.1 billion shares of common stock, par value $0.001 per share (the “Common Stock”), consisting of 1.0 billion shares of Class A common stock, par value $0.001 per share and 100.0 million shares of Class B common stock, par value $0.001 per share, and 20.0 million shares of preferred stock, par value $0.001 per share. In connection with the IPO, 1) all shares of the Company's outstanding convertible preferred units automatically converted into 15.1 million shares of Class A common stock and 39.4 million shares of Class B common stock, 2) all of the outstanding related party convertible notes and related party term loans automatically converted into 31.1 million shares of Class B common stock, and 3) all outstanding shares of Common Units were converted into 9.8 million shares of Class A common stock and 4.6 million shares of Class B common stock. As a result, following the completion of the IPO, the Company has two classes of authorized common stock: Class A common stock and Class B common stock, which were outstanding as of September 30, 2025.