WisdomTree (WT) 10-Q 10 May 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	Apr. 26, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Trading Symbol	WETF
Entity Registrant Name	WisdomTree Investments, Inc.
Entity Central Index Key	880,631
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		153,104,136

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 105,651	$ 54,193
Securities owned, at fair value	4,585	66,294
Securities held-to-maturity	1,000	1,000
Accounts receivable	20,732	21,309
Income taxes receivable	2,665	6,978
Prepaid expenses	3,910	3,550
Other current assets	181	1,007
Total current assets	138,724	154,331
Fixed assets, net	10,391	10,693
Note receivable, net (Note 6)	19,165	18,748
Securities held-to-maturity	20,264	20,299
Deferred tax asset, net	1,053	1,050
Investments, carried at cost	35,187	35,187
Goodwill	1,799	1,799
Intangible asset	12,029	12,085
Other noncurrent assets	1,378	793
Total assets	239,990	254,985
Current liabilities:
Fund management and administration payable	18,411	20,099
Compensation and benefits payable	6,199	28,053
Securities sold, but not yet purchased, at fair value		950
Accounts payable and other liabilities	9,138	8,246
Total current liabilities	33,748	57,348
Deferred rent payable	4,637	4,686
Total liabilities	38,385	62,034
Commitments and Contingencies (Note 9)
Stockholders' equity
Preferred stock, par value $0.01; 2,000 shares authorized:
Common stock, par value $0.01; 250,000 shares authorized; issued and outstanding: 137,751 and 136,996 at March 31, 2018 and December 31, 2017, respectively	1,378	1,370
Additional paid-in capital	218,488	216,006
Accumulated other comprehensive income	1,163	291
Accumulated deficit	(19,424)	(24,716)
Total stockholders' equity	201,605	192,951
Total liabilities and stockholders' equity	$ 239,990	$ 254,985

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	2,000,000	2,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	137,751,000	136,996,000
Common stock, shares outstanding	137,751,000	136,996,000

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues:
Advisory fees	$ 58,756	$ 53,262
Other income	849	1,337
Total revenues	59,605	54,599
Expenses:
Compensation and benefits	18,832	17,874
Fund management and administration	10,912	9,600
Marketing and advertising	3,195	3,537
Sales and business development	3,813	2,962
Professional and consulting fees	1,636	1,558
Occupancy, communications and equipment	1,363	1,353
Depreciation and amortization	355	337
Third-party sharing arrangements	1,725	932
Acquisition-related costs	2,062
Other	1,790	1,624
Total expenses	45,683	39,777
Income before taxes	13,922	14,822
Income tax expense	4,498	7,942
Net income	$ 9,424	$ 6,880
Net income per share-basic	$ 0.07	$ 0.05
Net income per share-diluted	$ 0.07	$ 0.05
Weighted-average common shares-basic	135,329	134,385
Weighted-average common shares-diluted	136,468	135,509
Cash dividends declared per common share	$ 0.03	$ 0.08

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 9,424	$ 6,880
Other comprehensive income/(loss)
Change in unrealized gains/(losses) on available-for-sale debt securities, net of tax	460	(103)
Foreign currency translation adjustment	412	245
Other comprehensive income	872	142
Comprehensive income	$ 10,296	$ 7,022

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 9,424	$ 6,880
Adjustments to reconcile net income to net cash (used in)/provided by operating activities:
Stock-based compensation	3,309	3,421
Realized losses on debt securities available-for-sale	716	176
Deferred income taxes	(136)	6,302
Paid-in-kind interest income (Note 6)	(416)
Depreciation and amortization	355	337
Other	(55)	(56)
Changes in operating assets and liabilities:
Securities owned, at fair value	1,106	1,292
Accounts receivable	606	(1,553)
Income taxes receivable/payable	4,297	177
Prepaid expenses	(360)	127
Other assets	160	64
Acquisition payable		(3,538)
Fund management and administration payable	(1,744)	(400)
Compensation and benefits payable	(22,003)	(9,772)
Securities sold, but not yet purchased, at fair value	(950)	(1,222)
Accounts payable and other liabilities	855	212
Net cash (used in)/provided by operating activities	(4,836)	2,447
Cash flows from investing activities:
Purchase of fixed assets	(17)	(193)
Purchase of securities held-to-maturity		(759)
Purchase of debt securities available-for-sale		(21,340)
Proceeds from held-to-maturity securities maturing or called prior to maturity	32	51
Proceeds from sales and maturities of debt securities available-for-sale	60,498	21,000
Net cash provided by/(used in) investing activities	60,513	(1,241)
Cash flows from financing activities:
Dividends paid	(4,132)	(10,930)
Shares repurchased	(734)	(3,628)
Proceeds from exercise of stock options	54	5
Net cash used in financing activities	(4,812)	(14,553)
Increase in cash flow due to changes in foreign exchange rate	593	262
Net increase/(decrease) in cash and cash equivalents	51,458	(13,085)
Cash and cash equivalents-beginning of period	54,193	92,722
Cash and cash equivalents-end of period	105,651	79,637
Supplemental disclosure of cash flow information:
Cash paid for taxes	$ 339	$ 1,247

Organization and Description of

Organization and Description of Business	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Organization and Description of Business	1. Organization and Description of Business WisdomTree Investments, Inc., through its global subsidiaries (collectively, “WisdomTree” or the “Company”), is an exchange traded product (“ETP”) sponsor and asset manager headquartered in New York. WisdomTree offers ETPs covering equity, fixed income, currency, alternative and commodity asset classes. The Company has the following wholly-owned operating subsidiaries: • WisdomTree Asset Management, Inc. • Boost Management Limited • WisdomTree Europe Limited • WisdomTree Management Limited • WisdomTree Japan Inc. • WisdomTree Commodity Services, LLC • WisdomTree Asset Management Canada, Inc. The WisdomTree ETFs are issued in the U.S. by WTT. WTT, a non-consolidated open-end non-consolidated non-consolidated The Board of Trustees and Board of Directors of WTT, BI and WTI, respectively, are separate from the Board of Directors of the Company. The respective Trustees and Directors of WTT, BI and WTI, as applicable, are primarily responsible for overseeing the management and affairs of the WisdomTree ETFs, Boost ETPs and the WisdomTree UCITS ETFs for the benefit of the WisdomTree ETF, Boost ETP and the WisdomTree UCITS ETF shareholders, respectively, and have contracted with the Company to provide for general management and administration services. The Company, in turn, has contracted with third parties to provide the majority of these administration services. In addition, certain officers of the Company provide general management services for WTT, BI and WTI. Acquisition of ETFS On November 13, 2017, the Company entered into a Share Sale Agreement as amended by the Waiver and Variation Agreement, dated April 11, 2018 (collectively referred to as the “Share Sale Agreement”) with ETF Securities Limited (“ETF Securities”) and WisdomTree International Holdings Ltd, an indirect wholly owned subsidiary of WisdomTree (“WisdomTree International”), pursuant to which the Company agreed to acquire the European exchange-traded commodity, currency and short-and-leveraged Pursuant to the Share Sale Agreement, the Company acquired ETFS for a purchase price consisting of (a) $253,000 in cash (including $53,000 paid from proceeds arising from maturities of securities owned, at fair value), subject to customary adjustments for working capital, and (b) a fixed number of shares of the Company’s capital stock, consisting of (i) 15,250,000 shares of common stock (the “Common Shares”) and (ii) 14,750 shares of Series A Non-Voting On April 11, 2018 and in connection with the ETFS acquisition, the Company and WisdomTree International entered into a credit agreement (the “Credit Agreement”), by and among the Company, WisdomTree International, certain subsidiaries of the Company as guarantors, the lenders party thereto and Credit Suisse AG, Cayman Islands Branch, as administrative agent, collateral agent, L/C Issuer and lender. Under the Credit Agreement, the lenders extended a $200,000 term loan (the “Term Loan”) to WisdomTree International, the net cash proceeds of which were used by WisdomTree International, together with other cash on hand, to complete the acquisition and pay certain related fees, costs and expenses, and made a $50,000 revolving credit facility (the “Revolver” and, together with the Term Loan, the “Credit Facility”) available to the Company and WisdomTree International for revolving borrowings from time to time for working capital, capital expenditures and general corporate purposes (See Note 19). On April 11, 2018 and in connection with the acquisition, the Company and ETF Securities also entered into an Investor Rights Agreement, pursuant to which, among other things, ETF Securities is subject to lock-up,

Significant Accounting Policies

Significant Accounting Policies	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Significant Accounting Policies	2. Significant Accounting Policies Basis of Presentation These consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”) and in the opinion of management reflect all adjustments, consisting of only normal recurring adjustments, necessary for a fair statement of financial condition, results of operations, and cash flows for the periods presented. The consolidated financial statements include the accounts of the Company’s wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. Consolidation The Company consolidates entities in which it has a controlling financial interest. The Company determines whether it has a controlling financial interest in an entity by first evaluating whether the entity is a voting interest entity (“VOE”) or a variable interest entity (“VIE”). The usual condition for a controlling financial interest in a VOE is ownership of a majority voting interest. If the Company has a majority voting interest in a VOE, the entity is consolidated. The Company has a controlling financial interest in a VIE when the Company has a variable interest that provides it with (i) the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE. The Company reassesses its evaluation of whether an entity is a VIE when certain reconsideration events occur. Segment and Geographic Information The Company operates as an ETP sponsor and asset manager providing investment advisory services in the U.S., Europe, Canada and Japan. These activities are reported in the Company’s U.S. Business and International Business reportable segments. The U.S. Business segment includes the results of the Company’s U.S. operations and Japan sales office, which primarily engages in selling U.S. listed ETFs to Japanese institutional clients. The results of the Company’s European and Canadian operations are reported as the International Business segment. Revenues are primarily derived in the U.S. and the vast majority of the Company’s AUM is currently located in the U.S. Foreign Currency Translation Assets and liabilities of subsidiaries whose functional currency is not the U.S. dollar are translated based on the end of period exchange rates from local currency to U.S. dollars. Results of operations are translated at the average exchange rates in effect during the period. The impact of the foreign currency translation adjustment is included in the Consolidated Statements of Comprehensive Income as a component of other comprehensive income. Use of Estimates The preparation of the Company’s consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the balance sheet dates and the reported amounts of revenues and expenses for the periods presented. Actual results could differ materially from those estimates. Revenue Recognition The Company earns substantially all of its revenue in the form of advisory fees from its ETPs and recognizes this revenue over time, as the performance obligation is satisfied. ETP advisory fees are based on a percentage of the ETPs’ average daily net assets. Progress is measured using the practical expedient under the output method resulting in the recognition of revenue in the amount for which the Company has a right to invoice. Depreciation and Amortization Depreciation is provided for using the straight-line method over the estimated useful lives of the related assets as follows: Equipment 5 years Furniture and fixtures 15 years Leasehold improvements are amortized over the term of their respective leases or service lives of the improvements, whichever is shorter. Fixed assets are recorded at cost less accumulated depreciation and amortization. Occupancy The Company accounts for its office lease facilities as operating leases, which may include free rent periods and escalation clauses. The Company expenses the lease payments associated with operating leases on a straight-line basis over the lease term. Marketing and Advertising Advertising costs, including media advertising and production costs, are expensed when incurred. Cash and Cash Equivalents The Company considers all highly liquid investments with an original maturity of 90 days or less at the time of purchase to be classified as cash equivalents. The Company maintains deposits with financial institutions in an amount that is in excess of federally insured limits. Accounts Receivable and Allowance for Doubtful Accounts Accounts receivable are customer and other obligations due under normal trade terms. An allowance for doubtful accounts is not provided since, in the opinion of management, all accounts receivable recorded are deemed current and collectible. Impairment of Long-Lived Assets The Company performs a review for the impairment of long-lived assets when events or changes in circumstances indicate that the estimated undiscounted future cash flows expected to be generated by the assets are less than their carrying amounts or when other events occur which may indicate that the carrying amount of an asset may not be recoverable. Earnings per Share Basic earnings per share (“EPS”) is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding for the period. Net income available to common stockholders represents net income of the Company reduced by an allocation of earnings to participating securities. Unvested share-based payment awards that contain non-forfeitable two-class two-class Note Receivable Note receivable is accounted for on an amortized cost basis, net of original issue discount. Interest income is accrued over the term of the note using the effective interest method. The Company performs a review for the impairment of the note receivable on a quarterly basis and provides for an allowance for credit losses if all or a portion of the note is determined to be uncollectible. Securities Owned and Securities Sold, but not yet Purchased (at fair value) Securities owned and securities sold, but not yet purchased are securities classified as either trading or available-for-sale Securities Held-to-Maturity The Company accounts for certain of its investments as held-to-maturity held-to-maturity more-likely-than-not Investments, Carried at Cost The Company accounts for equity investments that do not have a readily determinable fair value as cost method investments under the measurement alternative prescribed within Accounting Standards Update (“ASU”) 2016-01, Financial Instruments – Recognition and Measurement of Financial Assets and Financial Liabilities Goodwill Goodwill is the excess of the fair value of the purchase price over the fair values of the identifiable net assets at the acquisition date. The Company tests its goodwill for impairment at least annually and at the time of a triggering event requiring re-evaluation, 2017-04, Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment For impairment testing purposes, goodwill has been allocated to the Company’s U.S. Business reporting unit which is assessed annually for impairment on April 30 th th Intangible Assets Indefinite-lived intangible assets are tested for impairment at least annually and are also reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Indefinite-lived intangible assets are impaired if their estimated fair values are less than their carrying values. Finite-lived intangible assets, if any, are amortized over their estimated useful life, which is the period over which the assets are expected to contribute directly or indirectly to the future cash flows of the Company. These intangible assets are tested for impairment at the time of a triggering event, if one were to occur. Finite-lived intangible assets may be impaired when the estimated undiscounted future cash flows generated from the assets are less than their carrying amounts. The Company may rely on a qualitative assessment when performing its intangible asset impairment test. Otherwise, the impairment evaluation is performed at the lowest level of reasonably identifiable cash flows independent of other assets. The annual impairment testing date for all of the Company’s intangible assets is November 30 th Stock-Based Awards Accounting for stock-based compensation requires the measurement and recognition of compensation expense for all equity awards based on estimated fair values. Stock-based compensation is measured based on the grant-date fair value of the award and is amortized over the relevant service period. Forfeitures are recognized when they occur. Income Taxes The Company accounts for income taxes using the liability method, which requires the determination of deferred tax assets and liabilities based on the differences between the financial and tax basis of assets and liabilities using the enacted tax rates in effect for the year in which differences are expected to reverse. Deferred tax assets are adjusted by a valuation allowance if, based on the weight of available evidence, it is more-likely-than-not In order to recognize and measure any unrecognized tax benefits, management evaluates and determines whether any of its tax positions are more-likely-than-not Non-income Third-Party Sharing Arrangements The Company pays a percentage of its advisory fee revenues based on incremental growth in AUM, subject to caps or minimums, to marketing agents to sell WisdomTree ETFs and for including WisdomTree ETFs on third party customer platforms. Recently Issued Accounting Pronouncements In May 2014, the Financial Accounting Standards Board, or FASB, issued ASU 2014-09, Revenue from Contracts with Customers 2014-09), 2016-08, 2016-10, 2016-12, 2014-09. 2014-09 2014-09, In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326) – Measurement of Credit Losses on Financial Instruments 2016-13). off-balance off-balance held-to-maturity) 2016-13 2016-13 In February 2016, the FASB issued ASU 2016-02, Leases 2016-02), 2016-02 gross-up right-of-use In January 2016, the FASB issued ASU 2016-01, Financial Instruments – Recognition and Measurement of Financial Assets and Financial Liabilities 2016-01). Available-for-sale 2016-01

Cash and Cash Equivalents

Cash and Cash Equivalents	3 Months Ended
	Mar. 31, 2018
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	3. Cash and Cash Equivalents Cash and cash equivalents of approximately $70,619 and $24,103 at March 31, 2018 and December 31, 2017, respectively, were held at one financial institution. At March 31, 2018 and December 31, 2017, cash equivalents were approximately $68,041 and $26,548, respectively.

Securities Owned and Securities

Securities Owned and Securities Sold, but not yet Purchased (and Fair Value Measurement)	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Securities Owned and Securities Sold, but not yet Purchased (and Fair Value Measurement)	4. Securities Owned and Securities Sold, but not yet Purchased (and Fair Value Measurement) Securities owned and securities sold, but not yet purchased are measured at fair value. The fair value of securities is defined as the price that would be received to sell an asset or paid to transfer a liability (i.e., “the exit price”) in an orderly transaction between market participants at the measurement date. Accounting Standards Codification (“ASC”) 820, Fair Value Measurements Level 1 – Quoted prices for identical instruments in active markets. Level 2 – Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations whose inputs are observable or whose significant value drivers are observable. Level 3 – Instruments whose significant drivers are unobservable. The availability of observable inputs can vary from product to product and is affected by a wide variety of factors, including, for example, the type of product, whether the product is new and not yet established in the marketplace, and other characteristics particular to the transaction. To the extent that valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. Accordingly, the degree of judgment exercised by management in determining fair value is greatest for instruments categorized in Level 3. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, for disclosure purposes, the level in the fair value hierarchy within which the fair value measurement in its entirety falls is determined based on the lowest level input that is significant to the fair value measurement in its entirety. Fair Valuation Methodology Cash and Cash Equivalents (Note 3) Note Receivable (Note 6) – Securities Held-to-Maturity Securities Owned/Sold But Not Yet Purchased March 31, December 31, Securities Owned Trading securities $ 585 $ 1,691 Available-for-sale 4,000 64,603 Total $ 4,585 $ 66,294 Securities Sold, but not yet Purchased Trading securities $ — $ 950 Available-for-sale — — Total $ — $ 950 Trading securities are investments in ETFs. These instruments are generally traded in active, quoted and highly liquid markets and are therefore classified as Level 1 in the fair value hierarchy. AFS debt securities are investments in short-term investment grade corporate bonds and are classified as Level 2. Fair value is generally derived from observable bids for these Level 2 financial instruments. AFS Debt Securities The following table summarizes unrealized gains, losses and fair value of the AFS debt securities: March 31, December 31, Cost $ 4,022 $ 65,237 Gross unrealized gains in other comprehensive income — — Gross unrealized losses in other comprehensive income (22 ) (634 ) Fair value $ 4,000 $ 64,603 All the Company’s AFS debt securities are due within one year. The Company assesses the AFS debt securities for other-than-temporary impairment on a quarterly basis. No AFS debt securities were determined to be other-than-temporarily impaired at March 31, 2018 or December 31, 2017. During the three months ended March 31, 2018 and 2017, the Company received $60,498 and $21,000, respectively, of proceeds from the sale and maturity of available-for-sale

Securities Held-to-Maturity

Securities Held-to-Maturity	3 Months Ended
	Mar. 31, 2018
Text Block [Abstract]
Securities Held-to-Maturity	5. Securities Held-to-Maturity The following table is a summary of the Company’s securities held-to-maturity: March 31, December 31, Federal agency debt instruments (amortized cost) $ 21,264 $ 21,299 The following table summarizes unrealized gains, losses, and fair value of securities held-to-maturity: March 31, December 31, Cost/amortized cost $ 21,264 $ 21,299 Gross unrealized gains 7 9 Gross unrealized losses (1,770 ) (1,257 ) Fair value $ 19,501 $ 20,051 The Company assesses these securities for other-than-temporary impairment on a quarterly basis. No securities were determined to be other-than-temporarily impaired at March 31, 2018 or December 31, 2017. The Company does not intend to sell these securities and it is not more likely than not that the Company will be required to sell the securities before recovery of their amortized cost bases, which may be maturity. The following table sets forth the maturity profile of the securities held-to-maturity; March 31, December 31, Due within one year $ 1,000 $ 1,000 Due one year through five years 8 11 Due five years through ten years 6,026 6,027 Due over ten years 14,230 14,261 Total $ 21,264 $ 21,299

Note Receivable

Note Receivable	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
Note Receivable	6. Note Receivable On December 29, 2017, the Company committed to provide up to $30,000 in additional working capital to AdvisorEngine pursuant to an unsecured promissory note (of which $22,000 is currently funded) (See Note 9). The majority of the funds were used by AdvisorEngine to acquire CRM Software, Inc., known as Junxure, a comprehensive client relationship management software and technology provider for financial advisors. All principal amounts under the note bear interest from the date such amounts are advanced until repaid at a rate of 5% per annum, provided that immediately upon the occurrence and during the continuance of an event of default (as defined), interest will be increased to 10% per annum. All accrued and unpaid interest is treated as paid-in-kind In connection with providing funding to AdvisorEngine for the acquisition of Junxure, the Company secured an option to purchase the remaining equity interests in AdvisorEngine. The option was ascribed a fair value of $3,278 (See Note 7) which gave rise to original issue discount reducing the carrying value of the note. The following is a summary of the outstanding note receivable balance: March 31, December 31, Note receivable (face value) $ 22,000 $ 22,000 Less: Original issue discount (“OID”), unamortized (3,110 ) (3,252 ) Plus: PIK interest 275 — Total note receivable, net $ 19,165 $ 18,748 Commitment remaining $ 8,000 $ 8,000 During the three months ended March 31, 2018, the Company recognized interest income of $416 which included OID amortization and accrued PIK interest. The Company determined that an allowance for credit loss was not necessary at March 31, 2018 and December 31, 2017 as the note receivable was recently issued and no adverse events or circumstances have occurred which may indicate that its carrying amount may not be recoverable. The carrying value of the note receivable at March 31, 2018 and December 31, 2017 approximates fair value as the implied discount rate of the note is similar to observable high yield credit spreads. The Company’s remaining commitment to provide working capital to AdvisorEngine is $8,000 at March 31, 2018 pursuant to the terms of the note. The additional funding is scheduled to be provided on June 30, 2018 and September 30, 2018 in the amounts of $5,000 and $3,000, respectively, if no event of default (as defined) has occurred and is continuing.

Investments, Carried at Cost

Investments, Carried at Cost	3 Months Ended
	Mar. 31, 2018
Investments Schedule [Abstract]
Investments, Carried at Cost	7. Investments, Carried at Cost The following table sets forth the Company’s investments, carried at cost: March 31, December 31, AdvisorEngine – Preferred stock $ 25,000 $ 25,000 AdvisorEngine – Option 3,278 3,278 Thesys Group, Inc. (“Thesys”) 6,909 6,909 Total $ 35,187 $ 35,187 AdvisorEngine Preferred Stock On November 18, 2016, the Company made a $20,000 strategic investment in AdvisorEngine, an end-to-end The Series A Preferred is convertible into common stock at the option of the Company and contains various rights and protections including a non-cumulative On April 27, 2017, the Company invested an additional $5,000 in AdvisorEngine to help facilitate AdvisorEngine’s acquisition of Kredible Technologies, Inc., a technology enabled, research-driven practice management firm designed to help advisors acquire new clients, and to continue to fuel AdvisorEngine’s growth, leadership and innovation in the advisor solutions space. The Company received 2,646,062 shares of Series A-1 The Company’s aggregate equity ownership interest in AdvisorEngine is approximately 47% (or 41% on a fully-diluted basis). The investment is accounted for under the cost method of accounting as it is not considered to be in-substance Option On December 29, 2017, the Company secured an option to purchase the remaining equity interests in AdvisorEngine, in connection with its commitment to provide up to $30,000 of additional working capital (See Note 6). The option is for a period of approximately one year and is exercisable at a price derived from an agreed-upon enterprise valuation of AdvisorEngine. If exercised, closing of the acquisition would occur no later than January 15, 2019. The fair value of the option was determined to be $3,278 on December 29, 2017, using a Monte Carlo simulation which was predominantly based on unobservable inputs and is therefore classified as Level 3. The enterprise value was derived from unobservable inputs including a weighted average cost of capital (“WACC”) of 27% and an option volatility of 40%. An increase in the WACC would reduce AdvisorEngine’s enterprise value which would reduce the fair value of the option, whereas an increase in the option volatility would increase the fair value of the option. The option is not accounted for as a derivative as it cannot be net settled and is not readily convertible to cash. Therefore, the option is accounted for under the cost method of accounting and is assessed for impairment on a quarterly basis. No impairment existed at March 31, 2018 or December 31, 2017. Thesys On June 20, 2017, the Company was issued 7,797,533 newly authorized shares of Series Y preferred stock (“Series Y Preferred”) of Thesys in connection with the resolution of a dispute related to the Company’s ownership stake in Thesys. The Series Y Preferred represents current ownership of 18.8% of Thesys on a fully diluted basis (excluding certain reserved shares). In addition, the Company was issued a warrant to purchase 3,898,766 shares of Series Y Preferred. The Series Y Preferred ranks pari passu The Company recorded the Series Y Preferred at its fair value of $6,909 during the second quarter of 2017. The Series Y Preferred is not considered to be in-substance

Fixed Assets, net

Fixed Assets, net	3 Months Ended
	Mar. 31, 2018
Property, Plant and Equipment [Abstract]
Fixed Assets, net	8. Fixed Assets, net The following table summarizes fixed assets: March 31, December 31, Equipment $ 1,916 $ 1,879 Furniture and fixtures 2,462 2,449 Leasehold improvements 11,087 11,037 Less: accumulated depreciation and amortization (5,074 ) (4,672 ) Total $ 10,391 $ 10,693

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	9. Commitments and Contingencies Contractual Obligations The Company has entered into obligations under operating leases with initial non-cancelable Future minimum lease payments with respect to non-cancelable Remainder of 2018 $ 3,114 2019 3,714 2020 3,338 2021 2,966 2022 and thereafter 21,300 Total $ 34,432 AdvisorEngine At March 31, 2018, the Company had a commitment to provide $8,000 of additional working capital to AdvisorEngine which is scheduled to be provided on June 30, 2018 and September 30, 2018 in the amounts of $5,000 and $3,000, respectively, if no event of default (as defined) has occurred and is continuing (See Note 6). Letter of Credit The Company collateralized its U.S. office lease through a standby letter of credit totaling $1,384. The collateral is included in cash and cash equivalents on the Company’s Consolidated Balance Sheets. Contingencies The Company may be subject to reviews, inspections and investigations by regulatory authorities as well as legal proceedings arising in the ordinary course of business. The Company is not currently party to any litigation that is expected to have a material adverse impact on its business, financial position, results of operations or cash flows.

Variable Interest Entity

Variable Interest Entity	3 Months Ended
	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable Interest Entity	10. Variable Interest Entity VIEs are entities with any of the following characteristics: (i) the entity does not have enough equity to finance its activities without additional financial support, (ii) the equity holders, as a group, lack the characteristics of a controlling financial interest or (iii) the entity is structured with non-substantive Consolidation of a VIE is required for the party deemed to be the primary beneficiary, if any. The primary beneficiary is the party who has both (a) the power to direct the activities of a VIE that most significantly impact the entity’s economic performance and (b) an obligation to absorb losses of the entity or a right to receive benefits from the entity that could potentially be significant to the entity. The Company is not the primary beneficiary of AdvisorEngine as it does not have the power to direct the activities that most significantly impact AdvisorEngine’s economic performance. Such power is conveyed through AdvisorEngine’s Board of Directors and the Company does not have control over the board. The following table presents information about the Company’s variable interests in AdvisorEngine (a non-consolidated March 31, 2018 December 31, Carrying Amount - Assets Preferred stock $ 25,000 $ 25,000 Note receivable - unsecured 19,165 18,748 Option 3,278 3,278 Total carrying amount - Assets $ 47,443 $ 47,026 Maximum exposure to loss $ 55,443 $ 55,026 The Company has a remaining commitment to provide working capital to AdvisorEngine of $8,000 at March 31, 2018 pursuant to the terms of the unsecured promissory note (See Note 6). The additional funding is scheduled to be provided on June 30, 2018 and September 30, 2018 in the amounts of $5,000 and $3,000, respectively, if no event of default (as defined) has occurred or is continuing.

Revenues from Contracts with Cu

Revenues from Contracts with Customers	3 Months Ended
	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Revenues from Contracts with Customers	11. Revenues from Contracts with Customers The following table presents the Company’s total revenues categorized as revenues from contracts with customers and other sources of revenues: Three Months March 31, 2018 Revenues from contracts with customers: Advisory fees $ 58,455 Other 301 Total revenues from contracts with customers 58,756 Other sources of revenues: Other 849 Total revenues $ 59,605 The Company recognizes revenues from contracts with customers when the performance obligation is satisfied, which is when the promised goods or services are transferred to the customer. A good or service is considered to be transferred when the customer obtains control, which is represented by the transfer of rights with regard to the good or service. Transfer of control happens either over time or at a point in time. When a performance obligation is satisfied over time, an entity is required to select a single method of measuring progress for each performance obligation that depicts the entity’s performance in transferring control of goods or services to the customer. Substantially all the Company’s revenues from contracts with customers are derived primarily from investment advisory agreements with related parties (See Note 12). These advisory fees are recognized over time, are earned from the Company’s ETPs and are calculated based on a percentage of the ETPs’ average daily net assets. There is no significant judgment in calculating amounts due which are invoiced monthly in arrears and are not subject to any potential reversal. Progress is measured using the practical expedient under the output method resulting in the recognition of revenue in the amount for which the Company has a right to invoice. There are no contract assets or liabilities that arise in connection with the recognition of advisory fee revenue. In addition, there are no costs incurred to obtain or fulfill the contracts with customers, all of which are investment advisory agreements with related parties. See Note 12 for further information including disaggregation of advisory fee revenue and amounts due from customers, all of which are derived from related parties. Advisory fee revenues are also reported by segment as disclosed within Note 18.

Related Party Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2018
Related Party Transactions [Abstract]
Related Party Transactions	12. Related Party Transactions The Company’s revenues are derived primarily from investment advisory agreements with related parties. Under these agreements, the Company has licensed to related parties the use of certain of its own indexes for the U.S. and Canadian WisdomTree ETFs and WisdomTree UCITS ETFs. The Board of Trustees and Board of Directors of the related parties are primarily responsible for overseeing the management and affairs of the U.S. and Canadian WisdomTree ETFs, Boost ETPs and WisdomTree UCITS ETFs for the benefit of their shareholders and have contracted with the Company to provide for general management and administration services. The Company is also responsible for certain expenses of the related parties, including the cost of transfer agency, custody, fund administration and accounting, legal, audit, and other non-distribution The following table summarizes accounts receivable from related parties which are included as a component of Accounts receivable on the Company’s Consolidated Balance Sheets: March 31, December 31, Receivable from WTT $ 18,389 $ 19,433 Receivable from BI and WTI 973 979 Receivable from WTCS 115 97 Receivable from WTAMC 103 87 Total $ 19,580 $ 20,596 The following table summarizes revenues from advisory services provided to related parties: Three Months Ended March 31, March 31, Advisory services provided to WTT $ 55,201 $ 50,456 Advisory services provided to BI and WTI 2,626 1,291 Advisory services provided to WTCS 317 570 Advisory services provided to WTAMC 311 81 Total $ 58,455 $ 52,398 The Company also has investments in certain WisdomTree ETFs of approximately $463 and $1,691 at March 31, 2018 and December 31, 2017, respectively. Gains and losses for the three months ended March 31, 2018 and 2017 were insignificant.

Stock-Based Awards

Stock-Based Awards	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Awards	13. Stock-Based Awards The Company grants equity awards to employees and directors which include restricted stock awards, restricted stock units and stock options. Stock options may be issued for terms of ten years and may vest after at least one year and have an exercise price equal to the Company’s stock price on the grant date. Restricted stock awards and restricted stock units are generally valued based on the Company’s stock price on the grant date. The Company estimates the fair value for stock options (when granted) using the Black-Scholes option pricing model. All restricted stock awards, restricted stock units and stock option awards require future service as a condition of vesting with certain awards subject to acceleration under certain conditions. On June 20, 2016, the Company’s stockholders approved a new equity award plan under which the Company can issue up to 10,000,000 shares of common stock (less one share for every share granted under prior plans since March 31, 2016 and inclusive of shares available under the prior plans as of March 31, 2016) in the form of stock options and other stock-based awards. The Company also has issued from time to time stock-based awards outside a plan. For the three months ended March 31, 2018 and 2017, total stock-based compensation expense was $3,309 and $3,421, respectively. A summary of unrecognized stock-based compensation expense and average remaining vesting period is as follows: March 31, 2018 Unrecognized Stock- Average Employees and directors restricted stock awards $ 21,638 1.91 A summary of stock options, restricted stock and restricted stock unit activity for the three months ended March 31, 2018 is as follows: Stock Restricted Restricted Balance at January 1, 2018 1,158,828 1,816,666 5,678 Granted — 730,028 7,152 Exercised/vested (173,291 ) (164,028 ) (734 ) Forfeitures — (63,609 ) — Balance at March 31, 2018 985,537 2,319,057 12,096

Earnings Per Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Share	14. Earnings Per Share The following is a reconciliation of the basic and diluted earnings per share computation: Three Months Ended March 31, 2018 2017 Net income $ 9,424 $ 6,880 (shares in thousands) Shares of common stock and common stock equivalents Weighted average common shares used in basic computation 135,329 134,385 Dilutive effect of common stock equivalents 1,139 1,124 Weighted average common shares used in dilutive computation 136,468 135,509 Basic earnings per share $ 0.07 $ 0.05 Diluted earnings per share $ 0.07 $ 0.05 In the table above, unvested share-based awards that have non-forfeitable Diluted earnings per share is calculated under both the treasury stock and two-class

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	15. Income Taxes Effective Income Tax Rate – Three Months Ended March 31, 2018 and March 31, 2017 The Company’s estimated effective income tax rate for the three months ended March 31, 2018 of 32.3% resulted in income tax expense of $4,498. The Company’s tax rate differs from the federal statutory tax rate of 21% (reduced from 35% due to the passage of the Tax Cuts and Jobs Act in December 2017) primarily due to a valuation allowance on foreign net operating losses and state and local income taxes, partly offset by tax windfalls associated with the vesting of stock-based compensation awards. The Company’s estimated effective income tax rate for the three months ended March 31, 2017 of 53.6% resulted in income tax expense of $7,942. The Company’s tax rate differs from the federal statutory tax rate of 35% primarily due to a valuation allowance on foreign net operating losses, tax shortfalls associated with the vesting of stock-based compensation awards and state and local income taxes. Net Operating Losses – U.S . The Company’s pre-tax Net Operating Losses – International The Company’s European and Canadian subsidiaries generated NOLs outside the U.S. These tax effected NOLs were $4,347 at March 31, 2018. The Company established a full valuation allowance related to these NOLs as it is more-likely-than-not Deferred Tax Assets A summary of the components of the Company’s deferred tax assets at March 31, 2018 and December 31, 2017 are as follows: March 31, December 31, Deferred tax assets: NOLs – Foreign $ 4,347 $ 3,841 Stock-based compensation 1,655 1,474 Deferred rent liability 1,245 1,257 NOLs – U.S. 779 909 Accrued expenses 769 526 Other 255 488 Deferred tax assets 9,050 8,495 Deferred tax liabilities: Unrealized gains 1,716 1,718 Fixed assets 1,498 1,498 Goodwill and intangible assets 436 388 Deferred tax liabilities 3,650 3,604 Total deferred tax assets less deferred tax liabilities 5,400 4,891 Less: valuation allowance (4,347 ) (3,841 ) Deferred tax assets, net $ 1,053 $ 1,050

Shares Repurchased

Shares Repurchased	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Shares Repurchased	16. Shares Repurchased On October 29, 2014, the Company’s Board of Directors authorized a three-year share repurchase program of up to $100,000. On April 27, 2016, the Board of Directors approved a $60,000 increase to the Company’s share repurchase program and extended the term through April 27, 2019. Included under this program are purchases to offset future equity grants made under the Company’s equity plans and are made in open market or privately negotiated transactions. This authority may be exercised from time to time and in such amounts as market conditions warrant, and subject to regulatory considerations. The timing and actual number of shares repurchased depends on a variety of factors including price, corporate and regulatory requirements, market conditions and other corporate liquidity requirements and priorities. The repurchase program may be suspended or terminated at any time without prior notice. Shares repurchased under this program are returned to the status of authorized and unissued on the Company’s books and records. As more fully disclosed in Note 1 and 19, the Company completed the acquisition of ETFS on April 11, 2018. To partially finance the acquisition, the Company and WisdomTree International entered into a Credit Agreement which contains customary negative covenants, including, among others, a covenant which may restrict the Company’s ability to repurchase equity interests. Share repurchases only are permitted to the extent the Total Leverage Ratio (as defined in the Credit Agreement) does not exceed 1.75 to 1.00 and no event of default (as defined in the Credit Agreement) has occurred and is continuing at the time the share repurchase is made. However, the Company’s ability to purchase shares of its common stock withheld pursuant to the terms of equity awards granted to employees to satisfy tax withholding obligations is not restricted. During the three months ended March 31, 2018 and March 31, 2017, the Company repurchased 60,508 shares and 346,529 shares of its common stock, respectively, under this program for an aggregate cost of $734 and $3,628, respectively. As of March 31, 2018, $87,880 remains under this program for future purchases.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	3 Months Ended
	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	17. Goodwill and Intangible Assets Goodwill has been allocated to the Company’s U.S. Business reporting unit and is deductible for tax purposes. The Company has designated April 30 th U.S. Business Balance at January 1, 2018 $ 1,799 Increases/(decreases) — Balance at March 31, 2018 $ 1,799 Intangible Asset (Indefinite-Lived) Advisory GCC Total Balance at January 1, 2018 $ 2,132 $ 9,953 $ 12,085 Foreign currency translation (56 ) — (56 ) Other increases/(decreases) — — — Balance at March 31, 2018 $ 2,076 $ 9,953 $ 12,029 Questrade ETFs During the fourth quarter of 2017, the Company acquired a suite of eight Canadian listed ETFs from Questrade, Inc. (the “Questrade ETFs”) with approximately CAD $99,108 (USD $77,403) in AUM at closing. The purchase price was CAD $2,675 (USD $2,132), all of which was allocated to the Company’s right to manage AUM in the form of advisory contracts. This intangible asset is translated based on the end of period exchange rates from local currency to U.S. dollars. Most of the Questrade ETFs were merged into the Company’s existing Canadian listed ETFs. The intangible assets (which are deductible for tax purposes) were determined to have an indefinite useful life. The Company has designated November 30 th WisdomTree Continuous Commodity Index Fund As part of the GreenHaven acquisition which occurred on January 1, 2016, the Company identified an intangible asset valued at $9,953 related to its customary advisory agreement with the GreenHaven Commodities ETF (renamed the WisdomTree Continuous Commodity Index Fund, or “GCC”). This intangible asset (which is deductible for tax purposes) was determined to have an indefinite useful life. The Company has designated November 30 th

Segment Reporting

Segment Reporting	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Segment Reporting	18. Segment Reporting The Company operates as an ETP sponsor and asset manager providing investment advisory services in the U.S., Europe, Canada and Japan. These activities are reported in the Company’s U.S. Business and International Business reportable segments. The U.S. Business segment includes the results of the Company’s U.S. operations and Japan sales office. The results of the Company’s European and Canadian operations are reported as the International Business segment. Information concerning these reportable segments are as follows: Three Months Ended March 31, 2018 2017 Revenues (U.S. Business segment) Advisory fees $ 55,518 $ 51,026 Other income 883 1,312 Total revenues (U.S. Business segment) $ 56,401 $ 52,338 Revenues (International Business segment) Advisory fees $ 3,238 $ 2,236 Other income/(loss) (34 ) 25 Total revenues (International Business segment) $ 3,204 $ 2,261 Total revenues $ 59,605 $ 54,599 Income/(loss) before taxes U.S. Business segment $ 17,371 $ 17,908 International Business segment (3,449 ) (3,086 ) Total income before taxes $ 13,922 $ 14,822 Assets are not reported by segment as such information is not utilized by the chief operating decision maker. The vast majority of the Company’s assets are located in the U.S.

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	19. Subsequent Events Acquisition of ETFS – Preliminary Purchase Price Allocation As previously disclosed within Note 1, the Company completed its acquisition of ETFS on April 11, 2018 by purchasing the entire issued share capital of a subsidiary of ETF Securities into which ETF Securities transferred ETFS prior to completion of the ETFS acquisition. Pursuant to the Share Sale Agreement, the Company acquired ETFS for a purchase price consisting of (a) $253,000 in cash (including $53,000 paid from proceeds arising from maturities of securities owned, at fair value), subject to customary adjustments for working capital, and (b) a fixed number of shares of the Company’s capital stock, consisting of (i) 15,250,000 Common Shares and (ii) 14,750 Preferred Shares, which are convertible, subject to certain restrictions, into an aggregate of 14,750,000 shares of common stock. The remainder of the cash consideration paid was financed through a $200,000 Term Loan. The ETFS acquisition will be accounted for under the acquisition method of accounting in accordance with ASC Topic 805, Business Combinations, The following table summarizes the preliminary allocation of the purchase price as of the acquisition date: Purchase price Preferred Shares issued 14,750 Conversion ratio 1,000 Common stock equivalents 14,750,000 Common Shares issued 15,250,000 Total shares issued 30,000,000 WisdomTree stock price (1) $ 9.00 Equity portion of purchase price $ 270,000 Cash portion of purchase price Term loan 200,000 Cash on hand 53,000 Purchase price 523,000 Deferred consideration (2) 172,746 Total $ 695,746 Preliminary allocation of consideration ETFS net assets acquired (3) 8,500 Intangible assets (4) 602,396 Fair value of net assets acquired 610,896 Preliminary goodwill resulting from the ETFS acquisition (5) $ 84,850 (1) The closing price of the Company’s common stock on April 10, 2018, the last trading day prior to the closing date of the acquisition. (2) ETF Securities first acquired Gold Bullion Securities Ltd. (“GBS Issuer”), one of the issuers that the Company acquired as part of the European ETC Business, paying no upfront consideration. Instead, the consideration was deferred and contracted to be paid by ETF Securities in fixed payments of physical gold bullion equating to 9,500 ounces per year through March 31, 2058 and then subsequently reduced to 6,333 ounces of gold continuing into perpetuity. ETF Securities’ deferred consideration obligation did not terminate upon the Company’s acquisition of the European ETC Business. Instead, a wholly-owned subsidiary of the Company assumed the obligation by entering into a Gold Royalty Agreement with ETF Securities, which provides for the same fixed payments of physical gold bullion payable to ETF Securities in order for ETF Securities to continue to satisfy its deferred consideration obligation. The fixed payments are paid from advisory fee income generated by the physically backed gold exchange traded product issued by GBS Issuer and any other Company sponsored financial product physically backed by physical gold (“Gold ETCs”). The fixed payment is subject to adjustment and reduction for declines in advisory fee income generated by the Gold ETCs, with any reduction remaining due and payable until paid in full. ETF Securities’ recourse is limited to such advisory fee income and has no recourse back to the Company for any unpaid amounts. ETF Securities ultimately has the right to claw back GBS Issuer if the Company fails to remit any amounts due. (3) Pursuant to the Share Sale Agreement, consideration transferred is subject to customary adjustments for working capital. The target working capital amount, as defined within the Share Sale Agreement is estimated to be $8,500. ETF Securities has 45 business days following completion of the acquisition to provide a closing balance sheet. It is anticipated that the carrying value of the net assets acquired, approximates fair value. (4) Represents purchase price allocated to customary advisory agreements. These intangible assets were determined to have an indefinite useful life and are not deductible for tax purposes. A deferred tax liability associated with these intangible assets was not recognized as the intangibles arose in Jersey, where the Company will be subject to a zero percent tax rate. (5) Preliminary goodwill arising from the ETFS acquisition represents the value of expected synergies created from combining operations of ETFS and the Company. The goodwill is not deductible for tax purposes as the transaction was structured as a stock acquisition occurring in the United Kingdom. The finalization of the purchase price allocation may result in changes to the valuation of assets and liabilities assumed, which could be material. The final allocation may include changes in fair values of the deferred consideration, changes in the allocation to the intangible assets and goodwill and other fair value adjustments. Accordingly, the allocation of consideration transferred as presented above is preliminary. The accounting for the business combination is expected to be finalized as soon as practicable within the measurement period in accordance with ASC 805, but in no event later than one year from April 11, 2018. Acquisition of ETFS – Senior Secured Debt Financing On April 11, 2018 and in connection with the ETFS acquisition, the Company and WisdomTree International entered into a Credit Agreement, by and among the Company, WisdomTree International, certain subsidiaries of the Company as guarantors, the lenders party thereto and Credit Suisse AG, Cayman Islands Branch, as administrative agent, collateral agent, L/C Issuer and lender. Under the Credit Agreement the lenders extended a $200,000 Term Loan to WisdomTree International, the net cash proceeds of which were used by WisdomTree International, together with other cash on hand, to complete the ETFS acquisition and pay certain fees, costs and expenses, and made a $50,000 Revolver available to the Company and WisdomTree International for revolving borrowings from time to time for working capital, capital expenditures and general corporate purposes. Interest on the Term Loan accrues at a rate per annum equal to LIBOR, plus up to 2.00% (commencing at LIBOR, plus 1.75%), and interest on the Revolver accrues at a rate per annum equal to LIBOR, plus up to 1.50% (commencing at LIBOR, plus 1.25%), in each case, with the exact interest rate margin determined based on the Total Leverage Ratio (as defined below). The Revolver is also subject to a facility fee equal to a rate per annum of up to 0.50% of the actual daily amount the aggregate commitments (whether used or unused) under the Revolver, with the exact facility fee rate determined based on the Total Leverage Ratio. The Credit Facility matures on April 11, 2021 (the “Maturity Date”). The Term Loan does not amortize and the entire principal balance is due in a single payment on the Maturity Date. The Credit Agreement includes a financial covenant that requires that the Company maintain a Total Leverage Ratio, calculated as of the last day of each fiscal quarter commencing with the fiscal quarter ending September 30, 2018, equal to or less than the ratio set forth opposite such fiscal quarter: Fiscal Quarter Ending Total Leverage Ratio September 30, 2018 2.75:1.00 December 31, 2018 2.75:1.00 March 31, 2019 2.75:1.00 June 30, 2019 2.50:1.00 September 30, 2019 2.50:1.00 December 31, 2019 2.50:1.00 March 31, 2020 2.25:1.00 June 30, 2020 2.25:1.00 September 30, 2020 and each subsequent fiscal quarter ending on or before the Maturity Date 2.00:1.00 Total Leverage Ratio means, as of the last day of any fiscal quarter, the ratio of Consolidated Total Debt of the Company and its restricted subsidiaries (as defined in the Credit Agreement) as of such date to Consolidated EBITDA of the Company and its restricted subsidiaries (as defined in the Credit Agreement) for the four consecutive fiscal quarters ended on such date. WisdomTree International’s obligations under the Term Loan and Revolver are unconditionally guaranteed by the Company and certain of its subsidiaries and secured by a lien on substantially all of the present and future property and assets of the Company, WisdomTree International and such subsidiaries, in each case, subject to customary exceptions and exclusions. The Company’s obligations under the Revolver are unconditionally guaranteed by certain of the Company’s wholly-owned domestic subsidiaries and secured by substantially all of the present and future property and assets of the Company and such subsidiaries, in each case, subject to customary exceptions and exclusions. The Credit Agreement contains customary affirmative covenants for transactions of this type and other affirmative covenants agreed to by the parties, including, among others, the provision of annual and quarterly financial statements and compliance certificates, maintenance of property, insurance, compliance with laws and environmental matters. The Credit Agreement contains customary negative covenants, including among others, restrictions on the incurrence of indebtedness, granting of liens, making investments and acquisitions, paying dividends, repurchasing equity interests of the Company, entering into affiliate transactions and asset sales. The Credit Agreement also provides for a number of customary events of default, including, among others, payment, bankruptcy, covenant, representation and warranty, change of control and judgment defaults. Acquisition of ETFS – Preferred Shares On April 10, 2018, the Company filed a Certificate of Designations of Series A Non-Voting In connection with the completion of the ETFS acquisition, the Company issued 14,750 Preferred Shares, which are convertible into an aggregate of 14,750,000 shares of common stock, subject to the following restrictions: • Limitation on beneficial ownership • Exchange Cap ETF Securities has the right to redeem the Preferred Shares under the following circumstances. However, the Company will not be obligated to make any such redemption payments to the extent such payments would be a breach of any covenant or obligation the Company owes to any of its secured creditors or is otherwise prohibited by applicable law. • Redemption right for failure to obtain stockholder approval 30-trading • Other redemption rights unrelated to stockholder approval 30-trading

Significant Accounting Polici26

Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation These consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”) and in the opinion of management reflect all adjustments, consisting of only normal recurring adjustments, necessary for a fair statement of financial condition, results of operations, and cash flows for the periods presented. The consolidated financial statements include the accounts of the Company’s wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.
Consolidation	Consolidation The Company consolidates entities in which it has a controlling financial interest. The Company determines whether it has a controlling financial interest in an entity by first evaluating whether the entity is a voting interest entity (“VOE”) or a variable interest entity (“VIE”). The usual condition for a controlling financial interest in a VOE is ownership of a majority voting interest. If the Company has a majority voting interest in a VOE, the entity is consolidated. The Company has a controlling financial interest in a VIE when the Company has a variable interest that provides it with (i) the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and (ii) the obligation to absorb losses of the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE. The Company reassesses its evaluation of whether an entity is a VIE when certain reconsideration events occur.
Segment and Geographic Information	Segment and Geographic Information The Company operates as an ETP sponsor and asset manager providing investment advisory services in the U.S., Europe, Canada and Japan. These activities are reported in the Company’s U.S. Business and International Business reportable segments. The U.S. Business segment includes the results of the Company’s U.S. operations and Japan sales office, which primarily engages in selling U.S. listed ETFs to Japanese institutional clients. The results of the Company’s European and Canadian operations are reported as the International Business segment. Revenues are primarily derived in the U.S. and the vast majority of the Company’s AUM is currently located in the U.S.
Foreign Currency Translation	Foreign Currency Translation Assets and liabilities of subsidiaries whose functional currency is not the U.S. dollar are translated based on the end of period exchange rates from local currency to U.S. dollars. Results of operations are translated at the average exchange rates in effect during the period. The impact of the foreign currency translation adjustment is included in the Consolidated Statements of Comprehensive Income as a component of other comprehensive income.
Use of Estimates	Use of Estimates The preparation of the Company’s consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the balance sheet dates and the reported amounts of revenues and expenses for the periods presented. Actual results could differ materially from those estimates.
Revenue Recognition	Revenue Recognition The Company earns substantially all of its revenue in the form of advisory fees from its ETPs and recognizes this revenue over time, as the performance obligation is satisfied. ETP advisory fees are based on a percentage of the ETPs’ average daily net assets. Progress is measured using the practical expedient under the output method resulting in the recognition of revenue in the amount for which the Company has a right to invoice.
Depreciation and Amortization	Depreciation and Amortization Depreciation is provided for using the straight-line method over the estimated useful lives of the related assets as follows: Equipment 5 years Furniture and fixtures 15 years Leasehold improvements are amortized over the term of their respective leases or service lives of the improvements, whichever is shorter. Fixed assets are recorded at cost less accumulated depreciation and amortization.
Occupancy	Occupancy The Company accounts for its office lease facilities as operating leases, which may include free rent periods and escalation clauses. The Company expenses the lease payments associated with operating leases on a straight-line basis over the lease term.
Marketing and Advertising	Marketing and Advertising Advertising costs, including media advertising and production costs, are expensed when incurred.
Cash and Cash Equivalents	Cash and Cash Equivalents The Company considers all highly liquid investments with an original maturity of 90 days or less at the time of purchase to be classified as cash equivalents. The Company maintains deposits with financial institutions in an amount that is in excess of federally insured limits.
Accounts Receivable and Allowance for Doubtful Accounts	Accounts Receivable and Allowance for Doubtful Accounts Accounts receivable are customer and other obligations due under normal trade terms. An allowance for doubtful accounts is not provided since, in the opinion of management, all accounts receivable recorded are deemed current and collectible.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets The Company performs a review for the impairment of long-lived assets when events or changes in circumstances indicate that the estimated undiscounted future cash flows expected to be generated by the assets are less than their carrying amounts or when other events occur which may indicate that the carrying amount of an asset may not be recoverable.
Earnings per Share	Earnings per Share Basic earnings per share (“EPS”) is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding for the period. Net income available to common stockholders represents net income of the Company reduced by an allocation of earnings to participating securities. Unvested share-based payment awards that contain non-forfeitable two-class two-class
Note Receivable	Note Receivable Note receivable is accounted for on an amortized cost basis, net of original issue discount. Interest income is accrued over the term of the note using the effective interest method. The Company performs a review for the impairment of the note receivable on a quarterly basis and provides for an allowance for credit losses if all or a portion of the note is determined to be uncollectible.
Securities Owned and Securities Sold, but not yet Purchased (at fair value)	Securities Owned and Securities Sold, but not yet Purchased (at fair value) Securities owned and securities sold, but not yet purchased are securities classified as either trading or available-for-sale
Securities Held-to-Maturity	Securities Held-to-Maturity The Company accounts for certain of its investments as held-to-maturity held-to-maturity more-likely-than-not
Investments, Carried at Cost	Investments, Carried at Cost The Company accounts for equity investments that do not have a readily determinable fair value as cost method investments under the measurement alternative prescribed within Accounting Standards Update (“ASU”) 2016-01, Financial Instruments – Recognition and Measurement of Financial Assets and Financial Liabilities
Goodwill	Goodwill Goodwill is the excess of the fair value of the purchase price over the fair values of the identifiable net assets at the acquisition date. The Company tests its goodwill for impairment at least annually and at the time of a triggering event requiring re-evaluation, 2017-04, Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment For impairment testing purposes, goodwill has been allocated to the Company’s U.S. Business reporting unit which is assessed annually for impairment on April 30 th th
Intangible Assets	Intangible Assets Indefinite-lived intangible assets are tested for impairment at least annually and are also reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Indefinite-lived intangible assets are impaired if their estimated fair values are less than their carrying values. Finite-lived intangible assets, if any, are amortized over their estimated useful life, which is the period over which the assets are expected to contribute directly or indirectly to the future cash flows of the Company. These intangible assets are tested for impairment at the time of a triggering event, if one were to occur. Finite-lived intangible assets may be impaired when the estimated undiscounted future cash flows generated from the assets are less than their carrying amounts. The Company may rely on a qualitative assessment when performing its intangible asset impairment test. Otherwise, the impairment evaluation is performed at the lowest level of reasonably identifiable cash flows independent of other assets. The annual impairment testing date for all of the Company’s intangible assets is November 30 th
Stock-Based Awards	Stock-Based Awards Accounting for stock-based compensation requires the measurement and recognition of compensation expense for all equity awards based on estimated fair values. Stock-based compensation is measured based on the grant-date fair value of the award and is amortized over the relevant service period. Forfeitures are recognized when they occur.
Income Taxes	Income Taxes The Company accounts for income taxes using the liability method, which requires the determination of deferred tax assets and liabilities based on the differences between the financial and tax basis of assets and liabilities using the enacted tax rates in effect for the year in which differences are expected to reverse. Deferred tax assets are adjusted by a valuation allowance if, based on the weight of available evidence, it is more-likely-than-not In order to recognize and measure any unrecognized tax benefits, management evaluates and determines whether any of its tax positions are more-likely-than-not Non-income
Third Party Sharing Arrangements	Third-Party Sharing Arrangements The Company pays a percentage of its advisory fee revenues based on incremental growth in AUM, subject to caps or minimums, to marketing agents to sell WisdomTree ETFs and for including WisdomTree ETFs on third party customer platforms.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements In May 2014, the Financial Accounting Standards Board, or FASB, issued ASU 2014-09, Revenue from Contracts with Customers 2014-09), 2016-08, 2016-10, 2016-12, 2014-09. 2014-09 2014-09, In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326) – Measurement of Credit Losses on Financial Instruments 2016-13). off-balance off-balance held-to-maturity) 2016-13 2016-13 In February 2016, the FASB issued ASU 2016-02, Leases 2016-02), 2016-02 gross-up right-of-use In January 2016, the FASB issued ASU 2016-01, Financial Instruments – Recognition and Measurement of Financial Assets and Financial Liabilities 2016-01). Available-for-sale 2016-01

Significant Accounting Polici27

Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Schedule of Estimated Useful Lives of Related Assets	Depreciation is provided for using the straight-line method over the estimated useful lives of the related assets as follows: Equipment 5 years Furniture and fixtures 15 years

Securities Owned and Securiti28

Securities Owned and Securities Sold, but not yet Purchased (and Fair Value Measurement) (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Schedule of Securities Owned/Sold But Not Yet Purchased	Securities Owned/Sold But Not Yet Purchased March 31, December 31, Securities Owned Trading securities $ 585 $ 1,691 Available-for-sale 4,000 64,603 Total $ 4,585 $ 66,294 Securities Sold, but not yet Purchased Trading securities $ — $ 950 Available-for-sale — — Total $ — $ 950
Schedule of Unrealized Gains, Losses and Fair Value of AFS Debt Securities	The following table summarizes unrealized gains, losses and fair value of the AFS debt securities: March 31, December 31, Cost $ 4,022 $ 65,237 Gross unrealized gains in other comprehensive income — — Gross unrealized losses in other comprehensive income (22 ) (634 ) Fair value $ 4,000 $ 64,603

Securities Held-to-Maturity (Ta

Securities Held-to-Maturity (Tables)	3 Months Ended
	Mar. 31, 2018
Text Block [Abstract]
Schedule of Securities Held-to-Maturity	The following table is a summary of the Company’s securities held-to-maturity: March 31, December 31, Federal agency debt instruments (amortized cost) $ 21,264 $ 21,299
Schedule of Unrealized Gains, Losses and Fair Value of Securities Held-to-Maturity	The following table summarizes unrealized gains, losses, and fair value of securities held-to-maturity: March 31, December 31, Cost/amortized cost $ 21,264 $ 21,299 Gross unrealized gains 7 9 Gross unrealized losses (1,770 ) (1,257 ) Fair value $ 19,501 $ 20,051
Schedule of Maturity Profile of Securities Held-to-Maturity	The following table sets forth the maturity profile of the securities held-to-maturity; March 31, December 31, Due within one year $ 1,000 $ 1,000 Due one year through five years 8 11 Due five years through ten years 6,026 6,027 Due over ten years 14,230 14,261 Total $ 21,264 $ 21,299

Note Receivable (Tables)

Note Receivable (Tables)	3 Months Ended
	Mar. 31, 2018
Receivables [Abstract]
Summary of Outstanding Note Receivable Balance	The following is a summary of the outstanding note receivable balance: March 31, December 31, Note receivable (face value) $ 22,000 $ 22,000 Less: Original issue discount (“OID”), unamortized (3,110 ) (3,252 ) Plus: PIK interest 275 — Total note receivable, net $ 19,165 $ 18,748 Commitment remaining $ 8,000 $ 8,000

Investments, Carried at Cost (T

Investments, Carried at Cost (Tables)	3 Months Ended
	Mar. 31, 2018
Investments Schedule [Abstract]
Investments at Carried Cost	The following table sets forth the Company’s investments, carried at cost: March 31, December 31, AdvisorEngine – Preferred stock $ 25,000 $ 25,000 AdvisorEngine – Option 3,278 3,278 Thesys Group, Inc. (“Thesys”) 6,909 6,909 Total $ 35,187 $ 35,187

Fixed Assets, net (Tables)

Fixed Assets, net (Tables)	3 Months Ended
	Mar. 31, 2018
Property, Plant and Equipment [Abstract]
Schedule of Fixed Assets	The following table summarizes fixed assets: March 31, December 31, Equipment $ 1,916 $ 1,879 Furniture and fixtures 2,462 2,449 Leasehold improvements 11,087 11,037 Less: accumulated depreciation and amortization (5,074 ) (4,672 ) Total $ 10,391 $ 10,693

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Lease Payments	Future minimum lease payments with respect to non-cancelable Remainder of 2018 $ 3,114 2019 3,714 2020 3,338 2021 2,966 2022 and thereafter 21,300 Total $ 34,432

Variable Interest Entity (Table

Variable Interest Entity (Tables)	3 Months Ended
	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Summary of Information about Variable Interests	The following table presents information about the Company’s variable interests in AdvisorEngine (a non-consolidated March 31, 2018 December 31, Carrying Amount - Assets Preferred stock $ 25,000 $ 25,000 Note receivable - unsecured 19,165 18,748 Option 3,278 3,278 Total carrying amount - Assets $ 47,443 $ 47,026 Maximum exposure to loss $ 55,443 $ 55,026

Revenues from Contracts with 35

Revenues from Contracts with Customers (Tables)	3 Months Ended
	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Summary of Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues	The following table presents the Company’s total revenues categorized as revenues from contracts with customers and other sources of revenues: Three Months March 31, 2018 Revenues from contracts with customers: Advisory fees $ 58,455 Other 301 Total revenues from contracts with customers 58,756 Other sources of revenues: Other 849 Total revenues $ 59,605

Related Party Transactions (Tab

Related Party Transactions (Tables)	3 Months Ended
	Mar. 31, 2018
Related Party Transactions [Abstract]
Summary of Accounts Receivable from Related Parties	The following table summarizes accounts receivable from related parties which are included as a component of Accounts receivable on the Company’s Consolidated Balance Sheets: March 31, December 31, Receivable from WTT $ 18,389 $ 19,433 Receivable from BI and WTI 973 979 Receivable from WTCS 115 97 Receivable from WTAMC 103 87 Total $ 19,580 $ 20,596
Summary of Revenues from Advisory Services Provided to Related Parties	The following table summarizes revenues from advisory services provided to related parties: Three Months Ended March 31, March 31, Advisory services provided to WTT $ 55,201 $ 50,456 Advisory services provided to BI and WTI 2,626 1,291 Advisory services provided to WTCS 317 570 Advisory services provided to WTAMC 311 81 Total $ 58,455 $ 52,398

Stock-Based Awards (Tables)

Stock-Based Awards (Tables)	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Unrecognized Stock-Based Compensation Expense and Average Remaining Vesting Period	A summary of unrecognized stock-based compensation expense and average remaining vesting period is as follows: March 31, 2018 Unrecognized Stock- Average Employees and directors restricted stock awards $ 21,638 1.91
Summary of Stock Options, Restricted Stock and Restricted Stock Unit Activity	A summary of stock options, restricted stock and restricted stock unit activity for the three months ended March 31, 2018 is as follows: Stock Restricted Restricted Balance at January 1, 2018 1,158,828 1,816,666 5,678 Granted — 730,028 7,152 Exercised/vested (173,291 ) (164,028 ) (734 ) Forfeitures — (63,609 ) — Balance at March 31, 2018 985,537 2,319,057 12,096

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Reconciliation of Basic and Diluted Earnings Per Share	The following is a reconciliation of the basic and diluted earnings per share computation: Three Months Ended March 31, 2018 2017 Net income $ 9,424 $ 6,880 (shares in thousands) Shares of common stock and common stock equivalents Weighted average common shares used in basic computation 135,329 134,385 Dilutive effect of common stock equivalents 1,139 1,124 Weighted average common shares used in dilutive computation 136,468 135,509 Basic earnings per share $ 0.07 $ 0.05 Diluted earnings per share $ 0.07 $ 0.05

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Summary of Deferred Tax Assets Recorded	A summary of the components of the Company’s deferred tax assets at March 31, 2018 and December 31, 2017 are as follows: March 31, December 31, Deferred tax assets: NOLs – Foreign $ 4,347 $ 3,841 Stock-based compensation 1,655 1,474 Deferred rent liability 1,245 1,257 NOLs – U.S. 779 909 Accrued expenses 769 526 Other 255 488 Deferred tax assets 9,050 8,495 Deferred tax liabilities: Unrealized gains 1,716 1,718 Fixed assets 1,498 1,498 Goodwill and intangible assets 436 388 Deferred tax liabilities 3,650 3,604 Total deferred tax assets less deferred tax liabilities 5,400 4,891 Less: valuation allowance (4,347 ) (3,841 ) Deferred tax assets, net $ 1,053 $ 1,050

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Goodwill Activity	The following table summarizes the goodwill activity during the period: U.S. Business Balance at January 1, 2018 $ 1,799 Increases/(decreases) — Balance at March 31, 2018 $ 1,799
Summary of Indefinite-lived Intangible Asset	Intangible Asset (Indefinite-Lived) Advisory GCC Total Balance at January 1, 2018 $ 2,132 $ 9,953 $ 12,085 Foreign currency translation (56 ) — (56 ) Other increases/(decreases) — — — Balance at March 31, 2018 $ 2,076 $ 9,953 $ 12,029

Segment Reporting (Tables)

Segment Reporting (Tables)	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Reportable Segment Information	Information concerning these reportable segments are as follows: Three Months Ended March 31, 2018 2017 Revenues (U.S. Business segment) Advisory fees $ 55,518 $ 51,026 Other income 883 1,312 Total revenues (U.S. Business segment) $ 56,401 $ 52,338 Revenues (International Business segment) Advisory fees $ 3,238 $ 2,236 Other income/(loss) (34 ) 25 Total revenues (International Business segment) $ 3,204 $ 2,261 Total revenues $ 59,605 $ 54,599 Income/(loss) before taxes U.S. Business segment $ 17,371 $ 17,908 International Business segment (3,449 ) (3,086 ) Total income before taxes $ 13,922 $ 14,822

Subsequent Events (Tables)

Subsequent Events (Tables)	3 Months Ended
	Mar. 31, 2018
Subsequent Events [Abstract]
Summary of Allocation Of Preliminary Purchase Price	The following table summarizes the preliminary allocation of the purchase price as of the acquisition date: Purchase price Preferred Shares issued 14,750 Conversion ratio 1,000 Common stock equivalents 14,750,000 Common Shares issued 15,250,000 Total shares issued 30,000,000 WisdomTree stock price (1) $ 9.00 Equity portion of purchase price $ 270,000 Cash portion of purchase price Term loan 200,000 Cash on hand 53,000 Purchase price 523,000 Deferred consideration (2) 172,746 Total $ 695,746 Preliminary allocation of consideration ETFS net assets acquired (3) 8,500 Intangible assets (4) 602,396 Fair value of net assets acquired 610,896 Preliminary goodwill resulting from the ETFS acquisition (5) $ 84,850
Summary of Financial covenant and Leverage Ratio	The Credit Agreement includes a financial covenant that requires that the Company maintain a Total Leverage Ratio, calculated as of the last day of each fiscal quarter commencing with the fiscal quarter ending September 30, 2018, equal to or less than the ratio set forth opposite such fiscal quarter: Fiscal Quarter Ending Total Leverage Ratio September 30, 2018 2.75:1.00 December 31, 2018 2.75:1.00 March 31, 2019 2.75:1.00 June 30, 2019 2.50:1.00 September 30, 2019 2.50:1.00 December 31, 2019 2.50:1.00 March 31, 2020 2.25:1.00 June 30, 2020 2.25:1.00 September 30, 2020 and each subsequent fiscal quarter ending on or before the Maturity Date 2.00:1.00

Organizational and Description

Organizational and Description of Business - Additional Information (Detail) - Acquisition of ETFS Business [Member] - USD ($)	Nov. 13, 2017	Mar. 31, 2018	Apr. 11, 2018
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Acquisition completion date		Apr. 11, 2018
Business acquisition, cash paid	$ 253,000,000
Cash consideration paid from proceeds arising from maturities of securities owned, at fair value	$ 53,000,000
Business acquisition, number of common shares that the preferred stock is convertible into	14,750,000
Series A Non-Voting Convertible Preferred Stock [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Business acquisition, number of shares to be issued	14,750
Revolving Credit Facility [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Revolving credit facility maximum borrowing capacity			$ 50,000,000
Term Loan Facility [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Borrowing under term loan facility			$ 200,000,000
Common Stock [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Business acquisition, number of shares to be issued	15,250,000

Significant Accounting Polici44

Significant Accounting Policies - Schedule of Estimated Useful Lives of Related Assets (Detail)	3 Months Ended
	Mar. 31, 2018
Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	5 years
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	15 years

Significant Accounting Polici45

Significant Accounting Policies - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Cash and cash equivalents maturity period, maximum	90 days

Cash and Cash Equivalents - Add

Cash and Cash Equivalents - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Cash and Cash Equivalents [Abstract]
Cash equivalents held at financial institution	$ 68,041	$ 26,548
Cash and cash equivalents held at one financial institution	$ 70,619	$ 24,103

Securities Owned and Securiti47

Securities Owned and Securities Sold, but not yet Purchased (and Fair Value Measurement) - Additional Information (Detail) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018USD ($)Securities	Mar. 31, 2017USD ($)	Dec. 31, 2017Securities
Fair Value Disclosures [Abstract]
Liquid investments, original maturities	90 days
Number of AFS debt securities determined to be other than temporarily impaired | Securities	0		0
Proceeds from sale and maturity of available-for-sale securities	$ 60,498	$ 21,000
Recognized gross realized losses	$ 716	$ 176

Securities Owned and Securiti48

Securities Owned and Securities Sold, but not yet Purchased (and Fair Value Measurement) - Schedule of Securities Owned/Sold But Not Yet Purchased (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Securities Owned Total	$ 4,585	$ 66,294
Securities Sold, but not yet Purchased Total		950
Trading Securities [Member]
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Securities Owned Total	585	1,691
Securities Sold, but not yet Purchased Total		950
Available-for-sale Debt Securities [Member]
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Securities Owned Total	$ 4,000	$ 64,603

Securities Owned and Securiti49

Securities Owned and Securities Sold, but not yet Purchased (and Fair Value Measurement) - Schedule of Unrealized Gains, Losses and Fair Value of AFS Debt Securities (Detail) - Available-for-sale Debt Securities [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 4,022	$ 65,237
Gross unrealized gains in other comprehensive income	0	0
Gross unrealized losses in other comprehensive income	(22)	(634)
Fair value	$ 4,000	$ 64,603

Securities Held-to-Maturity - S

Securities Held-to-Maturity - Schedule of Securities Held-to-Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Federal agency debt instruments (amortized cost)	$ 21,264	$ 21,299
Federal Agency [Member]
Schedule of Held-to-maturity Securities [Line Items]
Federal agency debt instruments (amortized cost)	$ 21,264	$ 21,299

Securities Held-to-Maturity -51

Securities Held-to-Maturity - Schedule of Unrealized Gains, Losses and Fair Value of Securities Held-to-Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Held-to-maturity cost or amortized cost	$ 21,264	$ 21,299
Held-to-maturity gross unrealized gains	7	9
Held-to-maturity gross unrealized losses	(1,770)	(1,257)
Held-to-maturity fair value	$ 19,501	$ 20,051

Securities Held-to-Maturity - A

Securities Held-to-Maturity - Additional Information (Detail) - Securities	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Number of securities determined to be other than temporarily impaired	0	0

Securities Held-to-Maturity -53

Securities Held-to-Maturity - Schedule of Maturity Profile of Securities Held-to-Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Held-to-maturity due within one year	$ 1,000	$ 1,000
Held-to-maturity due one year through five years	8	11
Held-to-maturity due five years through ten years	6,026	6,027
Held-to-maturity due over ten years	14,230	14,261
Held-to-maturity cost or amortized cost	$ 21,264	$ 21,299

Note Receivables - Additional I

Note Receivables - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 29, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest rate	5.00%
Percentage of interest rate increase at the event of default	10.00%
Promissory note maturity date	Dec. 29, 2021
Interest income recognized	$ 416
AdvisorEngine [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate commitment amount				$ 30,000
Current funding amount				22,000
Remaining commitment amount	8,000
AdvisorEngine [Member] | Equity Option [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate commitment amount				30,000
Fair value of option	$ 3,278			$ 3,278
AdvisorEngine [Member] | Scenario, Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Remaining commitment amount		$ 3,000	$ 5,000

Note Receivables - Summary of O

Note Receivables - Summary of Outstanding Note Receivable Balance (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total note receivable, net	$ 19,165	$ 18,748
Notes Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Note receivable (face value)	22,000	22,000
Less: Original issue discount ("OID"), unamortized	(3,110)	(3,252)
Plus: PIK interest	275
Total note receivable, net	19,165	18,748
Commitment remaining	$ 8,000	$ 8,000

Investments, Carried at Cost -

Investments, Carried at Cost - Details of Investments Carried at Cost (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Nov. 18, 2016
Schedule of Cost-method Investments [Line Items]
Investments, carried at cost	$ 35,187	$ 35,187
AdvisorEngine [Member]
Schedule of Cost-method Investments [Line Items]
Investments, carried at cost			$ 20,000
AdvisorEngine [Member] | Convertible Preferred Stock [Member]
Schedule of Cost-method Investments [Line Items]
Investments, carried at cost	25,000	25,000
AdvisorEngine [Member] | Equity Option [Member]
Schedule of Cost-method Investments [Line Items]
Investments, carried at cost	3,278	3,278
Thesys Group, Inc [Member]
Schedule of Cost-method Investments [Line Items]
Investments, carried at cost	$ 6,909	$ 6,909

Investment, Carried at Cost - A

Investment, Carried at Cost - Additional Information (Detail) - USD ($)	Dec. 29, 2017	Jun. 20, 2017	Mar. 31, 2018	Dec. 31, 2017	Apr. 27, 2017	Nov. 18, 2016
Schedule of Cost-method Investments [Line Items]
Cost method investments			$ 35,187,000	$ 35,187,000
Equity Option [Member]
Schedule of Cost-method Investments [Line Items]
Impairment losses			$ 0	0
Option expiration period	Jan. 15, 2019
Weighted average cost of capital percentage	27.00%
Option volatility rate	40.00%
AdvisorEngine [Member]
Schedule of Cost-method Investments [Line Items]
Date of agreement			Nov. 18, 2016
Cost method investments						$ 20,000,000
Ownership interest percentage			47.00%
Original fully diluted ownership interest percentage			41.00%
Impairment losses			$ 0	0
Aggregate commitment amount	$ 30,000,000
AdvisorEngine [Member] | Equity Option [Member]
Schedule of Cost-method Investments [Line Items]
Cost method investments			3,278,000	3,278,000
Aggregate commitment amount	30,000,000
Fair value of option	$ 3,278,000		3,278,000
AdvisorEngine [Member] | Convertible Preferred Stock [Member]
Schedule of Cost-method Investments [Line Items]
Cost method investments			$ 25,000,000	25,000,000
AdvisorEngine [Member] | Convertible Preferred Stock [Member] | Series A Preferred Stock [Member]
Schedule of Cost-method Investments [Line Items]
Number of shares purchased			11,811,856
Non-cumulative dividend			6.00%
AdvisorEngine [Member] | Convertible Preferred Stock [Member] | Series A- One Convertible Preferred Stock [Member]
Schedule of Cost-method Investments [Line Items]
Cost method investments					$ 5,000,000
Number of shares purchased					2,646,062
Thesys Group, Inc [Member]
Schedule of Cost-method Investments [Line Items]
Cost method investments			$ 6,909,000	6,909,000
Impairment losses			$ 0	$ 0
Thesys Group, Inc [Member] | Convertible Preferred Stock [Member] | Series Y Preferred Stock [Member]
Schedule of Cost-method Investments [Line Items]
Fair value of option		$ 6,909,000
Number of shares issued		7,797,533
Current fully diluted ownership percentage		18.80%
Liquidation preference		$ 0.231
Thesys Group, Inc [Member] | Warrant [Member]
Schedule of Cost-method Investments [Line Items]
Warrant exercisable term		5 years
Qualified financing determined term		2 years
Thesys Group, Inc [Member] | Warrant [Member] | Series Y Preferred Stock [Member]
Schedule of Cost-method Investments [Line Items]
Warrants to purchase shares		3,898,766
Exercisable percentage of warrant if claim brought against Company		100.00%

Fixed Assets, net - Schedule of

Fixed Assets, net - Schedule of Fixed Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Less accumulated depreciation and amortization	$ (5,074)	$ (4,672)
Total	10,391	10,693
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	1,916	1,879
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	2,462	2,449
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	$ 11,087	$ 11,037

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Sep. 30, 2018	Jun. 30, 2018
Commitments And Contingencies [Line Items]
Operating leases expenses	$ 1,027	$ 1,120
Standby letter of credit	1,384
AdvisorEngine [Member]
Commitments And Contingencies [Line Items]
Remaining commitment amount	$ 8,000
AdvisorEngine [Member] | Scenario, Forecast [Member]
Commitments And Contingencies [Line Items]
Remaining commitment amount			$ 3,000	$ 5,000

Commitments and Contingencies60

Commitments and Contingencies - Schedule of Future Minimum Lease Payments (Detail) $ in Thousands	Mar. 31, 2018USD ($)
Commitments and Contingencies Disclosure [Abstract]
Remainder of 2018	$ 3,114
2,019	3,714
2,020	3,338
2,021	2,966
2022 and thereafter	21,300
Total	$ 34,432

Variable Interest Entity - Summ

Variable Interest Entity - Summary of Information about Variable Interests (Detail) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Carrying Amount - Assets
Preferred stock	$ 25,000,000	$ 25,000,000
Note receivable - unsecured	19,165,000	18,748,000
Option	3,278,000	3,278,000
Total carrying amount - Assets	47,443,000	47,026,000
Maximum exposure to loss	$ 55,443,000	$ 55,026,000

Variable Interest Entity - Addi

Variable Interest Entity - Additional Information (Detail) - AdvisorEngine [Member] - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Variable Interest Entity [Line Items]
Remaining commitment amount			$ 8,000
Scenario, Forecast [Member]
Variable Interest Entity [Line Items]
Remaining commitment amount	$ 3,000	$ 5,000

Revenues from Contracts with 63

Revenues from Contracts with Customers - Summary of Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items]
Total revenues from contracts with customers	$ 58,756
Total revenues	59,605	$ 54,599
Advisory Fees [Member]
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items]
Total revenues from contracts with customers	58,455
Other [Member]
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items]
Total revenues from contracts with customers	301
Other Sources of Revenues [Member]
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items]
Total revenues	$ 849

Revenues from Contracts with 64

Revenues from Contracts with Customers - Additional Information (Detail) - Advisory Fees [Member]	Mar. 31, 2018USD ($)
Revenue from Contracts with Customers [Line Items]
Contract assets	$ 0
Contract liabilities	0
Costs incurred to obtain or fulfill contracts with customers	$ 0

Related Party Transactions - Su

Related Party Transactions - Summary of Accounts Receivable from Related Parties (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Accounts receivable from related parties	$ 19,580	$ 20,596
WisdomTree Trust [Member]
Related Party Transaction [Line Items]
Accounts receivable from related parties	18,389	19,433
Boost Issuer PLC And WisdomTree Issuer plc [Member]
Related Party Transaction [Line Items]
Accounts receivable from related parties	973	979
WisdomTree Commodity Services LLC [Member]
Related Party Transaction [Line Items]
Accounts receivable from related parties	115	97
WisdomTree Asset Management Canada, Inc [Member]
Related Party Transaction [Line Items]
Accounts receivable from related parties	$ 103	$ 87

Related Party Transactions - 66

Related Party Transactions - Summary of Revenues from Advisory Services Provided to Related Parties (Detail) - Advisory Services [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Related Party Transaction [Line Items]
Revenue from related parties	$ 58,455	$ 52,398
WisdomTree Trust [Member]
Related Party Transaction [Line Items]
Revenue from related parties	55,201	50,456
Boost Issuer PLC And WisdomTree Issuer plc [Member]
Related Party Transaction [Line Items]
Revenue from related parties	2,626	1,291
WisdomTree Commodity Services LLC [Member]
Related Party Transaction [Line Items]
Revenue from related parties	317	570
WisdomTree Asset Management Canada, Inc [Member]
Related Party Transaction [Line Items]
Revenue from related parties	$ 311	$ 81

Stock-Based Awards - Additional

Stock-Based Awards - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 20, 2016	Mar. 31, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Stock option issuance period		10 years
Option vested period		1 year
Option issued period		Stock options may be issued for terms of ten years
Shares of common stock authorized to issue under equity award plan	10,000,000
Description of new equity award plan		On June 20, 2016, the Company's stockholders approved a new equity award plan under which the Company can issue up to 10,000,000 shares of common stock (less one share for every share granted under prior plans since March 31, 2016 and inclusive of shares available under the prior plans as of March 31, 2016) in the form of stock options and other stock-based awards.
Stock-based compensation expense		$ 3,309	$ 3,421

Stock-Based Awards - Summary of

Stock-Based Awards - Summary of Unrecognized Stock-Based Compensation Expense and Average Remaining Vesting Period (Detail) - Employees and Directors [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average Remaining Vesting Period	1 year 10 months 28 days
Unrecognized Stock-Based Compensation	$ 21,638

Stock-Based Awards - Summary 69

Stock-Based Awards - Summary of Stock Options, Restricted Stock and Restricted Stock Unit Activity (Detail)	3 Months Ended
	Mar. 31, 2018shares
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, beginning balance	1,158,828
Options, Granted	0
Options, Exercised/vested	(173,291)
Options, Forfeitures	0
Options, ending balance	985,537
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock, beginning balance	1,816,666
Restricted Stock, Granted	730,028
Restricted Stock, Exercised/vested	(164,028)
Restricted Stock, Forfeitures	(63,609)
Restricted Stock, ending balance	2,319,057
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock, beginning balance	5,678
Restricted Stock, Granted	7,152
Restricted Stock, Exercised/vested	(734)
Restricted Stock, ending balance	12,096

Earnings Per Share - Reconcilia

Earnings Per Share - Reconciliation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income	$ 9,424	$ 6,880
Shares of common stock and common stock equivalents:
Weighted average common shares used in basic computation	135,329	134,385
Dilutive effect of common stock equivalents	1,139	1,124
Weighted average common shares used in dilutive computation	136,468	135,509
Basic earnings per share	$ 0.07	$ 0.05
Diluted earnings per share	$ 0.07	$ 0.05

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Detail) - shares	Apr. 11, 2018	Nov. 13, 2017	Mar. 31, 2018	Dec. 31, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Anti-dilutive common stock equivalents excluded from calculation of diluted earnings per share			1,101,513	1,549,440
Acquisition of ETFS Business [Member] | Series A Non-Voting Convertible Preferred Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Business acquisition, number of shares to be issued		14,750
Common Stock [Member] | Acquisition of ETFS Business [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Business acquisition, number of shares to be issued		15,250,000
Subsequent Event [Member] | Acquisition of ETFS Business [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Business acquisition, number of shares to be issued	30,000,000
Subsequent Event [Member] | Acquisition of ETFS Business [Member] | Series A Non-Voting Convertible Preferred Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Business acquisition, number of shares to be issued	14,750
Subsequent Event [Member] | Common Stock [Member] | Acquisition of ETFS Business [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Business acquisition, number of shares to be issued	15,250,000

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Estimated effective rate	32.30%	53.60%
Income tax expense	$ 4,498	$ 7,942
Federal statutory rate	21.00%	35.00%
Pre-tax federal net operating losses	$ 3,147
Pre-tax federal net operating losses expiration date	2,024
Tax effected NOLs - Foreign	$ 4,347

Income Taxes - Summary of Defer

Income Taxes - Summary of Deferred Tax Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Deferred tax assets:
NOLs - Foreign	$ 4,347	$ 3,841
Stock-based compensation	1,655	1,474
Deferred rent liability	1,245	1,257
NOLs - U.S.	779	909
Accrued expenses	769	526
Other	255	488
Deferred tax assets	9,050	8,495
Deferred tax liabilities:
Unrealized gains	1,716	1,718
Fixed assets	1,498	1,498
Goodwill and intangible assets	436	388
Deferred tax liabilities	3,650	3,604
Total deferred tax assets less deferred tax liabilities	5,400	4,891
Less: valuation allowance	(4,347)	(3,841)
Deferred tax assets, net	$ 1,053	$ 1,050

Shares Repurchased - Additional

Shares Repurchased - Additional Information (Detail) - USD ($)	Apr. 27, 2016	Mar. 31, 2018	Mar. 31, 2017	Apr. 11, 2018	Oct. 29, 2014
Subsequent Event [Member] | Maximum [Member]
Class of Stock [Line Items]
Total Leverage Ratio				175.00%
Three-Year Share Repurchase Program [Member]
Class of Stock [Line Items]
Common stock purchase authorized amount					$ 100,000,000
Share repurchase program, increase in authorized amount	$ 60,000,000
Share repurchase program, extended term date	Apr. 27, 2019
Repurchased common stock, shares		60,508	346,529
Repurchased common stock, value		$ 734,000	$ 3,628,000
Dollar amount remaining available for future share repurchases		$ 87,880,000

Goodwill and Intangible Asset75

Goodwill and Intangible Assets - Summary of Goodwill Activity (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
Goodwill [Line Items]
Beginning balance	$ 1,799
Ending balance	1,799
Reportable Subsegments [Member] | U.S. Business segment [Member]
Goodwill [Line Items]
Beginning balance	1,799
Increases/(decreases)	0
Ending balance	$ 1,799

Goodwill and Intangible Asset76

Goodwill and Intangible Assets - Summary of Indefinite-lived Intangible Asset (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
Indefinite-lived Intangible Assets [Line Items]
Beginning balance	$ 12,085
Foreign currency translation	(56)
Other increases/(decreases)	0
Ending balance	12,029
GreenHaven Commodity Services, LLC [Member]
Indefinite-lived Intangible Assets [Line Items]
Beginning balance	9,953
Other increases/(decreases)	0
Ending balance	9,953
Questrade ETFs [Member]
Indefinite-lived Intangible Assets [Line Items]
Beginning balance	2,132
Foreign currency translation	(56)
Other increases/(decreases)	0
Ending balance	$ 2,076

Goodwill and Intangible Asset77

Goodwill and Intangible Assets - Additional Information (Detail) $ in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2017USD ($)Fund	Dec. 31, 2017CAD ($)Fund	Mar. 31, 2018USD ($)	Jan. 01, 2016USD ($)
Indefinite-lived Intangible Assets [Line Items]
Intangible asset related to its customary advisory agreement	$ 12,085		$ 12,029
Questrade ETFs [Member]
Indefinite-lived Intangible Assets [Line Items]
Intangible asset related to its customary advisory agreement	$ 2,132		2,076
Questrade ETFs [Member] | WisdomTree Asset Management Canada, Inc [Member]
Indefinite-lived Intangible Assets [Line Items]
Number of ETF acquired by company | Fund	8	8
Assets under management	$ 77,403	$ 99,108
Acquisition of the right to manage Questrade Wealth Management Inc.'s ETFs	2,132	$ 2,675
GreenHaven Commodity Services, LLC [Member]
Indefinite-lived Intangible Assets [Line Items]
Intangible asset related to its customary advisory agreement	$ 9,953		$ 9,953	$ 9,953

Segment Reporting - Reportable

Segment Reporting - Reportable Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues
Advisory fees	$ 58,756	$ 53,262
Other income	849	1,337
Total revenues	59,605	54,599
Income/(loss) before taxes
Total income before taxes	13,922	14,822
U.S. Business segment [Member]
Revenues
Advisory fees	55,518	51,026
Other income	883	1,312
Total revenues	56,401	52,338
Income/(loss) before taxes
Total income before taxes	17,371	17,908
International Business Segment [Member]
Revenues
Advisory fees	3,238	2,236
Other income/(loss)	(34)	25
Total revenues	3,204	2,261
Income/(loss) before taxes
Total income before taxes	$ (3,449)	$ (3,086)

Subsequent Events - Preliminary

Subsequent Events - Preliminary Purchase Price Allocation - Additional Information (Detail) - Acquisition of ETFS Business [Member] - USD ($) $ in Thousands	Apr. 11, 2018	Nov. 13, 2017	Mar. 31, 2018
Subsequent Event [Line Items]
Business acquisition effective date			Apr. 11, 2018
Cash consideration paid from proceeds arising from maturities of securities owned, at fair value		$ 53,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Business acquisition effective date	Apr. 11, 2018
Payments to acquire business, gross	$ 253,000
Cash consideration paid from proceeds arising from maturities of securities owned, at fair value	$ 53,000
Shares issued in Business acquisition	30,000,000
Purchase price financed through Term Loan	$ 200,000
Subsequent Event [Member] | Common Stock [Member]
Subsequent Event [Line Items]
Shares issued in Business acquisition	15,250,000
Common stock equivalents	14,750,000
Subsequent Event [Member] | Preferred Stock [Member]
Subsequent Event [Line Items]
Shares issued in Business acquisition	14,750

Subsequent Events - Summary of

Subsequent Events - Summary of Allocation of Preliminary Purchase Price (Detail) $ / shares in Units, $ in Thousands	Apr. 11, 2018USD ($)$ / sharesshares	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Business Acquisition [Line Items]
Goodwill		$ 1,799	$ 1,799
Subsequent Event [Member] | Acquisition of ETFS Business [Member]
Business Acquisition [Line Items]
Total shares issued | shares	30,000,000
WisdomTree stock price | $ / shares	$ 9
Equity portion of purchase price	$ 270,000
Term loan	200,000
Cash on hand	53,000
Purchase price	523,000
Deferred consideration	172,746
Total	695,746
ETFS net assets acquired	8,500
Intangible assets	602,396
Fair value of net assets acquired	610,896
Goodwill	$ 84,850
Subsequent Event [Member] | Preferred Stock [Member] | Acquisition of ETFS Business [Member]
Business Acquisition [Line Items]
Total shares issued | shares	14,750
Conversion ratio	1,000
Subsequent Event [Member] | Common Stock [Member] | Acquisition of ETFS Business [Member]
Business Acquisition [Line Items]
Common stock equivalents | shares	14,750,000
Total shares issued | shares	15,250,000

Subsequent Events - Summary o81

Subsequent Events - Summary of Allocation of Preliminary Purchase Price (Parenthetical) (Detail)	Apr. 11, 2018USD ($)oz	Mar. 31, 2018
Business Acquisition [Line Items]
Post-closing matters		ETF Securities has 45 business days following completion of the acquisition to provide a closing balance sheet.
Subsequent Event [Member]
Business Acquisition [Line Items]
Upfront consideration paid | $	$ 0
Estimated target working capital | $	$ 8,500,000
April 1, 2018 through March 31, 2058 [Member] | Subsequent Event [Member]
Business Acquisition [Line Items]
Fixed payments ounces of gold per year | oz	9,500
April 1, 2058 and Thereafter [Member] | Subsequent Event [Member]
Business Acquisition [Line Items]
Fixed payments ounces of gold per year | oz	6,333

Subsequent Events - Senior Secu

Subsequent Events - Senior Secured Debt Financing - Additional Information (Detail) - Acquisition of ETFS Business [Member] - USD ($)	Apr. 11, 2018	Mar. 31, 2018
Term Loan Facility [Member]
Subsequent Event [Line Items]
Debt instrument, interest rate		Interest on the Term Loan accrues at a rate per annum equal to LIBOR, plus up to 2.00% (commencing at LIBOR, plus 1.75%)
Debt instrument, variable rate basis		LIBOR
Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Debt instrument, interest rate		Revolver accrues at a rate per annum equal to LIBOR, plus up to 1.50% (commencing at LIBOR, plus 1.25%)
Revolving credit facility maximum borrowing capacity	$ 50,000,000
Subsequent Event [Member] | Term Loan Facility [Member]
Subsequent Event [Line Items]
Proceeds from term loan	$ 200,000,000
Subsequent Event [Member] | Term Loan Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Subsequent Event [Line Items]
Debt instrument, interest rate	1.75%
Subsequent Event [Member] | Term Loan Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Subsequent Event [Line Items]
Debt instrument, interest rate	2.00%
Subsequent Event [Member] | Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Revolving credit facility maximum borrowing capacity	$ 50,000,000
Debt instrument, facility fee rate	0.50%
Subsequent Event [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Subsequent Event [Line Items]
Debt instrument, interest rate	1.25%
Subsequent Event [Member] | Revolving Credit Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Subsequent Event [Line Items]
Debt instrument, interest rate	1.50%

Subsequent Events - Summary o83

Subsequent Events - Summary of Financial covenant and Leverage Ratio (Detail)	Apr. 11, 2018
September 30, 2018 [Member]
Line of Credit Facility [Line Items]
Total Leverage Ratio	2.75
December 31, 2018 [Member]
Line of Credit Facility [Line Items]
Total Leverage Ratio	2.75
March 31, 2019 [Member]
Line of Credit Facility [Line Items]
Total Leverage Ratio	2.75
June 30, 2019 [Member]
Line of Credit Facility [Line Items]
Total Leverage Ratio	2.50
September 30, 2019 [Member]
Line of Credit Facility [Line Items]
Total Leverage Ratio	2.50
December 31, 2019 [Member]
Line of Credit Facility [Line Items]
Total Leverage Ratio	2.50
March 31, 2020 [Member]
Line of Credit Facility [Line Items]
Total Leverage Ratio	2.25
June 30, 2020 [Member]
Line of Credit Facility [Line Items]
Total Leverage Ratio	2.25
September 30, 2020 [Member]
Line of Credit Facility [Line Items]
Total Leverage Ratio	2

Subsequent Events - Preferred S

Subsequent Events - Preferred Shares - Additional Information (Detail) - Acquisition of ETFS Business [Member] - shares	Apr. 11, 2018	Mar. 31, 2018
Subsequent Event [Line Items]
Convertible preferred stock terms of conversion		As described in the Certificate of Designations, the Company will not issue any shares of common stock upon conversion of the Preferred Shares if the issuance would, together with up to 4,000,000 shares of common stock that the Company may, but is not obligated to, issue prior to December 31, 2018, exceed the aggregate number of shares of common stock that the Company may issue without breaching its obligations under Nasdaq Capital Market Listing Rule 5635(a)(1), unless the Company obtains stockholder approval for the issuance of the Company’s common stock upon conversion of the Preferred Shares in excess of such amount (“Exchange Cap”).
Redemption right for failure to obtain stockholder approval		If stockholder approval for the issuance of the Company’s common stock upon conversion of the Preferred Shares in excess of the Exchange Cap is not obtained by December 31, 2018, ETF Securities will have the right, at its option, to require the Company to redeem the 6,633 Preferred Shares subject to the Exchange Cap during the period ending on the earlier of (a) December 31, 2020 and (b) the date stockholder approval for the issuance of the Company’s common stock upon conversion of the Preferred Shares in excess of the Exchange Cap is obtained. Any such redemption will be at a price per Preferred Share equal to the dollar volume-weighted average price for a share of common stock for the 30-trading day period ending on December 31, 2018 multiplied by 1,000. Such redemption payments will be made in 12 equal installments no later than 10 business days following the last day of each of the Company’s 12 fiscal quarters beginning on the day following the date ETF Securities exercises such redemption right.
Other redemption rights unrelated to stockholder approval		In the event that: (a) the number of shares of the Company’s common stock authorized by its certificate of incorporation is insufficient to permit the Company to convert all of the Preferred Shares requested by ETF Securities to be converted; or (b) ETF Securities does not, upon completion of a change of control of the Company, receive the same amount per Preferred Share as it would have received had each outstanding Preferred Share been converted into common stock immediately prior to the change of control, ETF Securities will have the right, at its option, to require the Company to redeem all the Preferred Shares specified to be converted during the period of time specified in the Certificate of Designations. Any such redemption will be at a price per Preferred Share equal to the dollar volume-weighted average price for a share of common stock for the 30-trading day period ending on the date of such attempted conversion or change of control, as applicable, multiplied by 1,000. Such redemption payment will be made in one payment no later than 10 business days following the last day of the Company’s first fiscal quarter that begins on a date following the date ETF Securities exercises such redemption right.
Subsequent Event [Member]
Subsequent Event [Line Items]
Preferred Shares subject to the Exchange Cap	6,633
Subsequent Event [Member] | Exchange Cap [Member]
Subsequent Event [Line Items]
Common stock issuable upon conversion of Preferred Shares subject to the Exchange Cap	6,633,293
Subsequent Event [Member] | Minimum [Member]
Subsequent Event [Line Items]
Common stock that may be issued prior to December 31, 2018	4,000,000