Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2019	Feb. 19, 2020	Jun. 28, 2019
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Period End Date	Dec. 31, 2019
Trading Symbol	WETF
Document Fiscal Period Focus	FY
Entity Registrant Name	WisdomTree Investments, Inc.
Entity Central Index Key	0000880631
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 812,553,857
Entity Common Stock, Shares Outstanding		156,436,919
Document Transition Report	false
Document Annual 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