Cover - shares	3 Months Ended
	Mar. 31, 2022	May 09, 2022
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2022
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	415 Mission Street
Entity Address, Address Line Two	Suite 5510
Entity Address, City or Town	San Francisco
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94105
City Area Code	(415)
Local Phone Number	881-1612
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		169,223,826
Entity Central Index Key	0001827821
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q1
Amendment Flag	false
Common Stock
Title of 12(b) Security	Common stock, par value $0.0001 per share
Trading Symbol	FRGE
Security Exchange Name	NYSE
Warrant
Title of 12(b) Security	Redeemable warrants, exercisable for shares of common stock at an exercise price of $11.50 per share
Trading Symbol	FRGE WS
Security Exchange Name	NYSE