Cover - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Mar. 25, 2024	Jun. 30, 2023
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2023
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-04321
Entity Registrant Name	Forge Global Holdings, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	98-1561111
Entity Address, Address Line One	4 Embarcadero Center
Entity Address, Address Line Two	Floor 15
Entity Address, City or Town	San Francisco
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94111
City Area Code	415
Local Phone Number	881-1612
Title of 12(b) Security	Common stock, par value $0.0001 per share
Trading Symbol	FRGE
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	true
Document Financial Statement Restatement Recovery Analysis [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 262,440
Entity Common Stock, Shares Outstanding		179,499,587
Documents Incorporated by Reference	Portions of the registrant’s proxy statement for the 2024 Annual Meeting of Stockholders are incorporated herein by reference in Part III of this Annual Report on Form 10-K to the extent stated herein. Such proxy statement will be filed with the Securities and Exchange Commission within 120 days after the end of the registrant’s fiscal year ended December 31, 2023.
Entity Central Index Key	0001827821
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Amendment Flag	false