Organization and Description of Business	12 Months Ended
Organization and Description of Business	Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Description of Business	Organization and Description of Business Forge Global Holdings, Inc. (the “Company”) is a financial services platform headquartered in San Francisco, California. The Company offers a trusted trading platform, proprietary data, and insights to inform investment strategies, along with custody services to help companies, stockholders, institutions, and accredited investors confidently navigate and transact in the private market. The Company's scaled and integrated business model is at the nexus of the private market ecosystem, which it believes creates a sustaining competitive advantage fueling its customers' participation in the private market and the Company's growth. On March 21, 2022 (the “Closing Date”), the Company consummated the Business Combination pursuant to the terms of the Agreement and Plan of Merger dated September 13, 2021 (the "Merger Agreement"), by and among Motive Capital Corp, a blank check company incorporated as a Cayman Islands exempted company in 2020 (“MOTV”), FGI Merger Sub Inc., a Delaware corporation and wholly owned subsidiary of MOTV (“Merger Sub”), and Forge Global, Inc., a Delaware corporation (“Legacy Forge”). Pursuant to the Merger Agreement, on the Closing Date, immediately prior to the consummation of the Business Combination, MOTV changed its jurisdiction of incorporation from the Cayman Islands to the State of Delaware and changed its corporate name to "Forge Global Holdings, Inc." (the “Domestication”). On the Closing Date, Merger Sub merged with and into Legacy Forge (the "Merger"), with Legacy Forge surviving the Merger as a direct, wholly-owned subsidiary of the Company (together with the Merger, the Domestication, and the other transactions contemplated by the Merger Agreement, the “Business Combination”). The Merger was accounted for as a reverse recapitalization with Legacy Forge being the accounting acquirer and MOTV as the acquired company for accounting purposes. Accordingly, all historical financial information presented in the consolidated financial statements represents the accounts of Legacy Forge and its wholly owned subsidiaries as if Legacy Forge is the predecessor to the Company. The shares and net loss per common share prior to the Merger have been retroactively restated as shares reflecting the exchange ratio (the "Exchange Ratio") as established by the Merger Agreement (each outstanding share of Legacy Forge Class A common stock was exchanged for 3.122931 shares of the Company’s common stock, including all shares of Legacy Forge preferred stock, which were converted to shares of Legacy Forge's Class A common stock immediately prior to the Merger). See Note 3, "Recapitalization" for additional information. Forge Europe GmbH In September 2022, the Company and Deutsche Börse Aktiengesellschaft (“DBAG,” a German company and together with the Company, the “Investors”) formed an entity, Forge Europe GmbH (“Forge Europe”), to further expand the Company’s business in the European market. Upon formation, the Investors contributed to Forge Europe an aggregate cash amount of $14.1 million (the “Cash Consideration”) and certain of the Company’s intangible assets (the “Noncash Consideration”). $4.6 million of the Cash Consideration was contributed by the Company and $9.5 million was contributed by DBAG. The Company has a majority ownership interest in Forge Europe and accounts for Forge Europe as a fully consolidated subsidiary. The remaining interest, held by DBAG (a related party of the Company), is reported as a noncontrolling interest in the consolidated financial statements.