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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2020
Feb. 08, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Fiscal Year Focus 2020    
Document Period End Date Dec. 31, 2020    
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 Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 478,656,235
Entity Common Stock, Shares Outstanding   149,815,815  
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    
ICFR Auditor Attestation Flag true