Cover Page - shares	3 Months Ended
	Mar. 31, 2021	Apr. 23, 2021
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Period End Date	Mar. 31, 2021
Trading Symbol	WETF
Document Fiscal Period Focus	Q1
Entity Registrant Name	WisdomTree Investments, Inc.
Entity Central Index Key	0000880631
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		149,591,742
Document Transition Report	false
Document Quarterly Report	true
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Title of 12(b) Security	Common Stock
Security Exchange Name	NASDAQ
Entity File Number	001-10932
Entity Address, Address Line One	245 Park Avenue, 35th Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10167
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	13-3487784
City Area Code	212
Local Phone Number	801-2080