Cover - shares	6 Months Ended
	Jun. 30, 2025	Aug. 06, 2025
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2025
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	99-4383083
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		13,601,362
Entity Central Index Key	0001827821
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q2
Amendment Flag	false