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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2021
Apr. 21, 2022
Jun. 30, 2021
Document Information [Line Items]      
Document Type 10-K/A    
Amendment Flag true    
Document Fiscal Year Focus 2021    
Document Period End Date Dec. 31, 2021    
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     $ 826,206,894
Entity Common Stock, Shares Outstanding   146,560,232  
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 230 Park Avenue    
Entity Address, Address Line Two 3rd Floor West    
Entity Address, City or Town New York    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10169    
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    
Auditor Name Ernst & Young LLP    
Auditor Firm ID 42    
Auditor Location NewYork, New York    
Amendment Description EXPLANATORY NOTE WisdomTree Investments, Inc. is filing this Amendment No. 1 on Form 10-K/A (this “Form 10-K/A”) to its Annual Report on Form 10-K for the fiscal year ended December 31, 2021, which was filed with the Securities and Exchange Commission (the “SEC”) on February 25, 2022 (the “Original Form 10-K”) to (i) revise four risk factors that are applicable to the Company, and (ii) present the information required by Part III of Form 10-K. This Part III information was previously omitted from the Original Form 10-K in reliance on General Instruction G(3) to Form 10-K, which permits the information in Part III to be incorporated in the Form 10-K by reference from our definitive proxy statement if such statement is filed no later than 120 days after our fiscal year-end. We are filing this Form 10-K/A to include Part III information in our Form 10-K because we will not file a definitive proxy statement containing this information within 120 days after the end of the fiscal year covered by the Original Form 10-K. This Form 10-K/A amends and restates in their entirety the cover page, Item 1A of Part I and Items 10, 11, 12, 13 and 14 of Part III of the Original Form 10-K as follows:     •   On the cover page, to (i) delete the reference in the Original Form 10-K to the incorporation by reference of the Company’s proxy statement for its 2022 Annual Meeting of Stockholders and (ii) update the date as of which the number of outstanding shares of the Company’s common stock is being provided;     •   To present in Part I, Item 1A, the risk factors captioned “Declining prices of securities, gold and other precious metals . . .”, “Declining commodity prices, and gold prices in particular, . . .”, “Actions of activist stockholders against us . . .” and “The market price of our common stock has been fluctuating . . . ,” which have been revised; and     •   To present the information required by Part III of Form 10-K, which information was originally expected to be incorporated by reference to our definitive proxy statement to be delivered to our stockholders in connection with our 2022 Annual Meeting of Stockholders. Pursuant to Rule 12b-15 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), this Form 10-K/A also contains certifications pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, which are attached hereto. Because no financial statements have been included in this Form 10-K/A and this Form 10-K/A does not contain or amend any disclosure with respect to Items 307 and 308 of Regulation S-K, paragraphs 3, 4 and 5 of the certifications have been omitted. Except as explicitly set forth herein, this Form 10-K/A does not purport to modify or update the disclosures in, or exhibits to, the Original Form 10-K or to update the Original Form 10-K to reflect events occurring after the date of such filing.      
Preferred Stock [Member]      
Document Information [Line Items]      
Trading Symbol WETF    
Title of 12(b) Security Preferred Stock Purchase Rights    
Security Exchange Name NASDAQ