WisdomTree (WT) 10-Q 9 Aug 18 2018 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Aug. 01, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
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		153,079,030

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 70,744	$ 54,193
Securities owned, at fair value	3,719	66,294
Securities held-to-maturity		1,000
Accounts receivable	27,329	21,309
Income taxes receivable		6,978
Prepaid expenses	6,545	3,550
Other current assets	194	1,007
Total current assets	108,531	154,331
Fixed assets, net	10,028	10,693
Note receivable, net (Note 8)	24,588	18,748
Indemnification receivable (Note 20)	28,339
Securities held-to-maturity	20,229	20,299
Deferred tax assets, net	2,024	1,050
Investments, carried at cost (Note 9)	35,187	35,187
Goodwill (Note 22)	85,856	1,799
Intangible assets (Note 22)	613,227	12,085
Other noncurrent assets	2,428	793
Total assets	930,437	254,985
Current liabilities:
Fund management and administration payable	22,002	20,099
Compensation and benefits payable	13,664	28,053
Deferred consideration - gold payments (Note 11)	11,378
Income taxes payable	1,252
Securities sold, but not yet purchased, at fair value	2,026	950
Accounts payable and other liabilities	9,366	8,246
Total current liabilities	66,721	57,348
Long-term debt (Note 12)	193,407
Deferred consideration - gold payments (Note 11)	151,470
Deferred rent payable	4,608	4,686
Other noncurrent liabilities (Note 20)	28,339
Total liabilities	444,545	62,034
Commitments and Contingencies (Note 14)
Stockholders' equity
Preferred stock, par value $0.01; 2,000 shares authorized:	0	0
Common stock, par value $0.01; 250,000 shares authorized; issued and outstanding: 153,142 and 136,996 at June 30, 2018 and December 31, 2017, respectively	1,531	1,370
Additional paid-in capital	359,066	216,006
Accumulated other comprehensive income	461	291
Accumulated deficit	(7,735)	(24,716)
Total stockholders' equity	353,323	192,951
Total liabilities and stockholders' equity	930,437	$ 254,985
ETFS Capital Limited [Member]
Current liabilities:
Payable to ETFS Capital Limited (Note 3)	7,033
Series A Preferred Stock [Member]
Temporary Equity
Preferred stock - Series A, Non-Voting Convertible, par value $0.01; 14,750 shares authorized, issued and outstanding (Note 13)	$ 132,569

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2018	Dec. 31, 2017
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	153,142,000	136,996,000
Common stock, shares outstanding	153,142,000	136,996,000
Series A Preferred Stock [Member]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	14,750
Preferred stock, shares issued	14,750
Preferred stock, shares outstanding	14,750

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating Revenues:
Total revenues	$ 74,775	$ 56,242	$ 133,679	$ 109,609
Operating Expenses:
Compensation and benefits	19,301	18,421	38,133	36,295
Fund management and administration	14,621	10,112	25,533	19,712
Marketing and advertising	3,778	3,825	6,973	7,362
Sales and business development	4,503	3,389	8,316	6,351
Contractual gold payments (Note 11)	2,715		2,715
Professional and consulting fees	1,560	1,221	3,196	2,779
Occupancy, communications and equipment	1,574	1,371	2,937	2,724
Depreciation and amortization	337	352	692	689
Third-party distribution fees	1,666	670	3,391	1,602
Acquisition-related costs (Note 3)	7,928		9,990
Other	2,261	1,842	4,051	3,466
Total expenses	60,244	41,203	105,927	80,980
Operating income	14,531	15,039	27,752	28,629
Other Income/(Expenses):
Interest expense	(2,356)		(2,356)
Gain on revaluation of deferred consideration - gold payments (Note 11)	9,898		9,898
Interest income	612	641	1,574	1,225
Settlement gain		6,909		6,909
Other gains and losses, net	(501)	(364)	(762)	284
Income before taxes	22,184	22,225	36,106	37,047
Income tax expense	5,460	10,120	9,958	18,062
Net income	$ 16,724	$ 12,105	$ 26,148	$ 18,985
Net income per share-basic	$ 0.10	$ 0.09	$ 0.17	$ 0.14
Net income per share-diluted	$ 0.10	$ 0.09	$ 0.17	$ 0.14
Weighted-average common shares-basic	149,056	134,557	142,230	134,472
Weighted-average common shares-diluted	163,346	135,574	149,979	135,613
Cash dividends declared per common share	$ 0.03	$ 0.08	$ 0.06	$ 0.16
Advisory Fees [Member]
Operating Revenues:
Total revenues	$ 73,778	$ 55,856	$ 132,234	$ 108,884
Other Income [Member]
Operating Revenues:
Total revenues	$ 997	$ 386	$ 1,445	$ 725

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 16,724	$ 12,105	$ 26,148	$ 18,985
Other comprehensive (loss)/income
Change in unrealized gains/(losses) on available-for-sale debt securities, net of tax	17	(31)	477	(134)
Foreign currency translation adjustment	(719)	194	(307)	439
Other comprehensive (loss)/income	(702)	163	170	305
Comprehensive income	$ 16,022	$ 12,268	$ 26,318	$ 19,290

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 26,148	$ 18,985
Adjustments to reconcile net income to net cash provided by operating activities:
Advisory fees paid in gold and other precious metals	(11,033)
Contractual gold payments	2,715
Gain on revaluation of deferred consideration - gold payments	(9,898)
Stock-based compensation	6,838	6,951
Deferred income taxes	(1,055)	5,890
Paid-in-kind interest income (Note 8)	(840)
Settlement gain		(6,909)
Amortization of credit facility issuance costs	637
Depreciation and amortization	692	689
Other	834	301
Changes in operating assets and liabilities, net of the effects of the ETFS Acquisition:
Securities owned, at fair value	(2,028)	1,148
Accounts receivable	2,871	(1,671)
Income taxes receivable/payable	8,109	2,217
Prepaid expenses	(1,669)	(1,405)
Gold and other precious metals	8,930
Other assets	975	143
Acquisition payable		(3,542)
Fund management and administration payable	(380)	(729)
Compensation and benefits payable	(21,170)	(3,958)
Securities sold, but not yet purchased, at fair value	1,077	(1,222)
Payable to ETFS Capital Limited	222
Accounts payable and other liabilities	(2,961)	395
Net cash provided by operating activities	9,014	17,283
Cash flows from investing activities:
Purchase of fixed assets	(34)	(220)
Purchase of securities held-to-maturity		(759)
Purchase of debt securities available-for-sale		(38,680)
Purchase of investments		(5,000)
Funding of AdvisorEngine note receivable (Note 8)	(5,000)
Proceeds from held-to-maturity securities maturing or called prior to maturity	1,063	2,102
Proceeds from sales and maturities of debt securities available-for-sale	64,498	46,065
Cash paid - ETFS Acquisition, net of cash acquired (Note 3)	(233,172)
Net cash (used in)/provided by investing activities	(172,645)	3,508
Cash flows from financing activities:
Dividends paid	(9,167)	(21,872)
Shares repurchased	(1,006)	(3,693)
Credit facility issuance costs	(8,690)
Preferred stock issuance costs	(181)
Proceeds from the issuance of long-term debt (Note 12)	200,000
Proceeds from exercise of stock options	139	42
Net cash provided by/(used in) financing activities	181,095	(25,523)
(Decrease)/increase in cash flow due to changes in foreign exchange rate	(913)	624
Net increase/(decrease) in cash and cash equivalents	16,551	(4,108)
Cash and cash equivalents-beginning of period	54,193	92,722
Cash and cash equivalents-end of period	70,744	88,614
Supplemental disclosure of cash flow information:
Cash paid for taxes	2,841	$ 9,708
Cash paid for interest	$ 1,241

Organization and Description of

Organization and Description of Business	6 Months Ended
	Jun. 30, 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, currencies, commodities and alternative strategies. The Company has the following wholly-owned operating subsidiaries: • WisdomTree Asset Management, Inc. non-consolidated open-end • ETFS Management Company (Jersey) Limited short-and-leveraged • Boost Management Limited non-consolidated • WisdomTree Management Limited non-consolidated • WisdomTree UK Limited • WisdomTree Europe Limited • WisdomTree Japan Inc. • WisdomTree Commodity Services, LLC • WisdomTree Asset Management Canada, Inc. Acquisition of ETFS On April 11, 2018, the Company acquired the European exchange-traded commodity, currency and short-and-leveraged

Significant Accounting Policies

Significant Accounting Policies	6 Months Ended
	Jun. 30, 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. The financial results of ETFS are included in our consolidated financial statements since the acquisition date, April 11, 2018 (See Note 3). Certain accounts in the prior years’ consolidated financial statements have been reclassified to conform to the current year’s consolidated financial statement presentation. The following table summarizes these reclassifications for the three and six months ended June 30, 2017, which had no effect on previously reported net income. Operating Revenues: Three Months Ended June 30, 2017 Six Months Ended June 30, 2017 Advisory fees (previously reported) $ 56,114 $ 109,376 Other ETP fees reclassified to Other income (258 ) (492 ) Advisory fees (currently reported) $ 55,856 $ 108,884 Settlement gain (previously reported) $ 6,909 $ 6,909 Reclassify to Other Income/(Expenses) (6,909 ) (6,909 ) Settlement gain (currently reported) $ — $ — Other income (previously reported) $ 405 $ 1,742 Other ETP fees reclassified from Advisory fees 258 492 Interest income reclassified to Other Income/(Expenses) (641 ) (1,225 ) Realized and unrealized losses reclassified to Other gains and losses, net 364 519 Miscellaneous other income reclassified to Other gains and losses, net — (803 ) Other income (currently reported) $ 386 $ 725 Total revenues (currently reported) $ 56,242 $ 109,609 Other Income/(Expenses): Interest income reclassified from operating revenues $ 641 $ 1,225 Settlement gain reclassified from operating revenues $ 6,909 $ 6,909 Other gains and losses, net (previously reported) $ — $ — Realized and unrealized losses reclassified from operating revenues (364 ) (519 ) Miscellaneous other income reclassified from operating revenues — 803 Other gains and losses, net (currently reported) $ (364 ) $ 284 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 globally. These activities are reported in the Company’s U.S. Business and International Business reportable segments. The International Business reportable segment includes the results of the Company’s European operations and Canadian operations. The financial results of ETFS are included in the International Business reportable segment as of the acquisition date. 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. Contractual Gold Payments Contractual gold payments are measured monthly based upon the average daily spot price of gold (See Note 11). Marketing and Advertising Advertising costs, including media advertising and production costs, are expensed when incurred. 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. 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. Third-Party Distribution Fees 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. 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. 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. available-for-sale 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 Deferred Consideration Deferred consideration represents the present value of an obligation to pay gold to a third party into perpetuity and is measured using forward-looking gold prices and a selected discount rate (See Note 5). Changes in the fair value of this obligation are reported as gain/(loss) on revaluation of deferred consideration on the Company’s Consolidated Statements of Operations. Long-Term Debt Long-term debt is carried at amortized cost, net of debt issuance costs. Interest expense is recognized using the effective interest method and includes amortization of debt issuance costs over the life of the debt. 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. The preferred stock issued in connection with the ETFS Acquisition (see Note 13) and unvested share-based payment awards that contain non-forfeitable two-class if-converted two-class 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 Tax positions are evaluated utilizing a two-step more-likely-than-not Non-income 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 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 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) available-for-sale available-for-sale 2016-13 2016-13 In February 2016, the FASB issued ASU 2016-02, Leases 2016-02), 2016-02 gross-up right-of-use

Business Combination

Business Combination	6 Months Ended
	Jun. 30, 2018
Business Combinations [Abstract]
Business Combination	3. Business Combination Summary 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 ETFS Capital and WisdomTree International Holdings Ltd, an indirect wholly owned subsidiary of the Company (“WisdomTree International”), pursuant to which the Company agreed to acquire ETFS. On April 11, 2018, the Company completed the acquisition by purchasing the entire issued share capital of a subsidiary of ETFS Capital into which ETFS Capital 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 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 12). On April 11, 2018 and in connection with the acquisition, the Company and ETFS Capital also entered into an Investor Rights Agreement, pursuant to which, among other things, ETFS Capital is subject to lock-up, Preliminary Purchase Price Allocation The ETFS Acquisition has been 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 (See Note 12) 200,000 Cash on hand 53,000 Purchase price 523,000 Deferred consideration (See Note 11) 172,746 Total $ 695,746 Preliminary allocation of consideration Cash and cash equivalents 19,828 Receivables and other current assets 14,069 Intangible assets (2) 601,247 Other current liabilities (23,455 ) Fair value of net assets acquired 611,689 Preliminary goodwill resulting from the ETFS Acquisition (3) $ 84,057 (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) Represents purchase price allocated to customary advisory agreements. The fair value of the intangible assets was determined using an income approach (discounted cash flow analysis) which relied upon significant unobservable inputs including a revenue growth multiple of 3% to 4% and a weighted average cost of capital of 11.6%. 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. (3) Preliminary goodwill arising from the ETFS Acquisition represents the value of expected synergies created from combining the 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 Company has until August 31, 2018 to satisfy itself with the opening balance sheet delivered by ETFS Capital. Pursuant to Clause 4.2 of the Share Sale Agreement, if the Completion Working Capital Amount (as defined) is greater than the Target Working Capital Amount (as defined), then the Company will owe ETFS Capital the excess amount. At June 30, 2018, this excess is $7,033 which is recorded as a payable to ETFS Capital on the Company’s consolidated balance sheet. Any changes to the opening balance sheet may result in an adjustment to the amount owed to ETFS Capital, or alternatively, goodwill. All other elements of the purchase price allocation are finalized. Acquisition-Related Costs During the three and six months ended June 30, 2018, the Company incurred acquisition-related costs associated with the ETFS Acquisition of $7,928 and $9,990 respectively, which included professional advisor fees, severance and other compensation costs, a write-off Operating Results of ETFS The Company’s Consolidated Statements of Operations include the following operating results of ETFS since the acquisition date of April 11, 2018 through June 30, 2018: Revenues: $22,934 Income before taxes: $18,102 (including a gain on revaluation of deferred consideration of $9,898) Supplemental Unaudited Pro Forma Financial Information The following table presents unaudited pro forma financial information of the Company as if the ETFS Acquisition had been consummated on January 1, 2017. The information was derived from the historical financial results of the Company and ETFS for all periods presented and was adjusted to give effect to pro forma events that are directly attributable to the acquisition, factually supportable and expected to have a continuing impact on the combined results following the acquisition. Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Revenues $ 78,025 $ 76,718 $ 157,796 $ 149,410 Net income $ 23,274 $ 15,554 $ 34,517 $ 17,451 Included within the proforma financial information above is a gain/(loss) on revaluation of deferred consideration of $8,326 and $319 for the three months ended June 30, 2018 and 2017, respectively, and $5,771 and ($8,039) for the six months ended June 30, 2018 and 2017, respectively. Significant adjustments to the unaudited pro forma financial information above include the recognition of interest expense associated with the Credit Facility for the periods presented, eliminating acquisition-related costs directly attributable to the acquisition and adjusting consolidated income tax expense based upon the Company’s anticipated normalized consolidated effective tax rate. The unaudited pro forma financial information above is not necessarily indicative of what the combined results of the Company would have been had the acquisition been completed as of January 1, 2017 and does not purport to project the future results of the combined company. In addition, the unaudited pro forma financial information does not reflect any future planned cost savings initiatives following the completion of the acquisition.

Cash and Cash Equivalents

Cash and Cash Equivalents	6 Months Ended
	Jun. 30, 2018
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	4. Cash and Cash Equivalents Cash and cash equivalents of approximately $31,805 and $24,103 at June 30, 2018 and December 31, 2017, respectively, were held at one financial institution. At June 30, 2018 and December 31, 2017, cash equivalents were approximately $4,701 and $26,548, respectively.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	5. Fair Value Measurements 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. The tables below summarize the categorization of the Company’s assets and liabilities measured at fair value. During the three and six months ended June 2018 and 2017 there were no transfers between Levels 1, 2 and 3. June 30, 2018 Total Level 1 Level 2 Level 3 Assets: Recurring fair value measurements: Cash and cash equivalents $ 70,744 $ 70,744 $ — $ — Securities owned, at fair value 3,719 3,719 — — Total $ 74,463 $ 74,463 — $ — Non-recurring AdvisorEngine Inc. – Option (1) $ 3,278 $ — $ — $ 3,278 Thesys Group, Inc. – Series Y preferred stock (2) 6,909 — — 6,909 Total $ 10,187 $ — $ — $ 10,187 Liabilities: Recurring fair value measurements: Deferred consideration (Note 11) $ 162,848 $ — $ — $ 162,848 Securities sold, but not yet purchased 2,026 2,026 — — Total $ 164,874 $ 2,026 $ — $ 162,848 December 31, 2017 Total Level 1 Level 2 Level 3 Assets: Recurring fair value measurements: Cash and cash equivalents $ 54,193 $ 54,193 $ — $ — Securities owned, at fair value 66,294 1,691 64,603 — Total $ 120,487 $ 55,884 $ 64,603 $ — Non-recurring AdvisorEngine Inc. – Option (1) $ 3,278 — — $ 3,278 Thesys Group, Inc. – Series Y preferred stock (2) 6,909 — — 6,909 Total $ 10,187 $ — $ — $ 10,187 Liabilities: Recurring fair value measurements: Securities sold, but not yet purchased $ 950 $ 950 $ — $ — Total $ 950 $ 950 $ — $ — (1) Fair value determined on December 29, 2017 (See Note 9) (2) Fair value determined on June 20, 2017 (See Note 9) Recurring Fair Value Measurements—Methodology Cash and Cash Equivalents (Note 4) Securities Owned/Sold but Not Yet Purchased (Note 6) Deferred Consideration The following table presents a reconciliation of beginning and ending balances of recurring fair value measurements classified as Level 3: Three Months Ended Six Months Ended 2018 2017 2018 2017 Deferred consideration (See Note 11) Beginning balance (1) $ 172,746 $ — $ 172,746 $ — Net realized losses/(gains) (2) 2,715 — 2,715 — Net unrealized losses/(gains) (3) (9,898 ) — (9,898 ) — Settlements (2,715 ) — (2,715 ) — Ending balance $ 162,848 $ — $ 162,848 $ — (1) Arose in connection with the completion of the ETFS Acquisition on April 11, 2018 (See Note 3). (2) Recorded as contractual gold payments on the Company’s Consolidated Statements of Operations. (3) Recorded as gain on revaluation of deferred consideration on the Company’s Consolidated Statements of Operations.

Securities Owned_Sold but Not Y

Securities Owned/Sold but Not Yet Purchased	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Securities Owned/Sold but Not Yet Purchased	6. Securities Owned/Sold but Not Yet Purchased These securities consist of securities classified as trading and available-for-sale, June 30, December 31, Securities Owned Trading securities $ 3,719 $ 1,691 Available-for-sale — 64,603 Total $ 3,719 $ 66,294 Securities Sold, but not yet Purchased Trading securities $ 2,026 $ 950 Available-for-sale — — Total $ 2,026 $ 950 Available-for-Sale The following table summarizes unrealized gains, losses and fair value of the available-for-sale June 30, December 31, Cost $ — $ 65,237 Gross unrealized gains in other comprehensive income — — Gross unrealized losses in other comprehensive income — (634 ) Fair value $ — $ 64,603 During the three and six months ended June 30, 2018, the Company received $4,000 and $64,498, respectively, of proceeds from the sale and maturity of available-for-sale During the three and six months ended June 30, 2017, the Company received $25,065 and $46,065, respectively, of proceeds from the sale and maturity of available-for-sale Realized losses have been reclassified out of accumulated other comprehensive income and into the Consolidated Statements of Operations.

Securities Held-to-Maturity

Securities Held-to-Maturity	6 Months Ended
	Jun. 30, 2018
Text Block [Abstract]
Securities Held-to-Maturity	7. Securities Held-to-Maturity The following table is a summary of the Company’s securities held-to-maturity: June 30, December 31, Federal agency debt instruments (amortized cost) $ 20,229 $ 21,299 The following table summarizes unrealized gains, losses, and fair value of securities held-to-maturity: June 30, December 31, Cost/amortized cost $ 20,229 $ 21,299 Gross unrealized gains 5 9 Gross unrealized losses (1,950 ) (1,257 ) Fair value $ 18,284 $ 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 June 30, 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; June 30, December 31, Due within one year $ — $ 1,000 Due one year through five years 6 11 Due five years through ten years 6,025 6,027 Due over ten years 14,198 14,261 Total $ 20,229 $ 21,299

Note Receivable

Note Receivable	6 Months Ended
	Jun. 30, 2018
Receivables [Abstract]
Note Receivable	8. Note Receivable On December 29, 2017, the Company committed to provide up to $30,000 in additional working capital to AdvisorEngine Inc. (“AdvisorEngine”) pursuant to an unsecured promissory note (of which $27,000 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 9) 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: June 30, December 31, Note receivable (face value) $ 27,000 $ 22,000 Less: Original issue discount (“OID”), unamortized (2,970 ) (3,252 ) Plus: PIK interest 558 — Total note receivable, net $ 24,588 $ 18,748 Commitment remaining $ 3,000 $ 8,000 During the three and six months ended June 30, 2018, the Company recognized interest income of $421 and $840, respectively, which included OID amortization and accrued PIK interest. The Company determined that an allowance for credit loss was not necessary at June 30, 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 June 30, 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 $3,000 at June 30, 2018 pursuant to the terms of the note. The additional funding is scheduled to be provided on September 30, 2018 if no event of default (as defined) has occurred and is continuing.

Investments, Carried at Cost

Investments, Carried at Cost	6 Months Ended
	Jun. 30, 2018
Investments Schedule [Abstract]
Investments, Carried at Cost	9. Investments, Carried at Cost The following table sets forth the Company’s investments, carried at cost: June 30, 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 8). 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 June 30, 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 pre-determined 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	6 Months Ended
	Jun. 30, 2018
Property, Plant and Equipment [Abstract]
Fixed Assets, net	10. Fixed Assets, net The following table summarizes fixed assets: June 30, December 31, Equipment $ 2,031 $ 1,879 Furniture and fixtures 2,391 2,449 Leasehold improvements 10,882 11,037 Less: accumulated depreciation and amortization (5,276 ) (4,672 ) Total $ 10,028 $ 10,693

Deferred Consideration

Deferred Consideration	6 Months Ended
	Jun. 30, 2018
Text Block [Abstract]
Deferred Consideration	11. Deferred Consideration ETFS Capital first acquired Gold Bullion Securities Ltd. (“GBS Issuer”), one of the issuers that the Company acquired as part of the ETFS Acquisition, paying no upfront consideration. Instead, the consideration was deferred and contracted to be paid by ETFS Capital in fixed payments of physical gold bullion equating to 9,500 ounces of gold per year through March 31, 2058 and then subsequently reduced to 6,333 ounces of gold continuing into perpetuity (the “Contractual Gold Payments”). ETFS Capital’s deferred consideration obligation did not terminate upon the Company’s acquisition of ETFS. Instead, a wholly-owned subsidiary of the Company assumed the obligation by entering into a Gold Royalty Agreement with ETFS Capital, which provides for the same Contractual Gold Payments payable to ETFS Capital in order for ETFS Capital to continue to satisfy its deferred consideration obligation. The Contractual Gold Payments are paid from advisory fee income generated by the physically backed gold exchange-traded products issued by GBS Issuer and any other Company sponsored financial product backed by physical gold (the “Gold ETCs”). The Contractual Gold Payments are 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. ETFS Capital’s recourse is limited to such advisory fee income and it has no recourse back to the Company for any unpaid amounts that exceed advisory fees earned. ETFS Capital ultimately has the right to claw back GBS Issuer if the Company fails to remit any amounts due. The Company determined the present value of the deferred consideration of $172,746 and $162,848 at April 11, 2018 (date of acquisition) and June 30, 2018, respectively, using forward-looking gold prices which were extrapolated from the last observable price (beyond 2024), discounted at a rate of 10.0%. Current and long-term amounts payable at June 30, 2018 were $11,378 and $151,470, respectively. During the three months ended June 30, 2018, the Company recognized Contractual Gold Payments expense of $2,715 arising from the fixed payments of physical gold bullion of 2,085 ounces (or 9,500 ounces per annum) and the unwinding of the discount (representing the increase in the carrying amount of the deferred consideration for the passage of time), as well as a gain on the revaluation of deferred consideration of $9,898 due to changes in gold prices. See Note 5 for a reconciliation of changes in the deferred consideration balance for the three months ended June 30, 2018.

Long-Term Debt

Long-Term Debt	6 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Long-Term Debt	12. Long-Term Debt 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 of 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 following table provides a summary of the Company’s outstanding borrowings under the Credit Facility: June 30, 2018 Term Loan Revolver Amount borrowed $ 200,000 $ — Unamortized issuance costs (6,593 ) 1,460 Carrying amount $ 193,407 $ 1,460 Effective interest rate (1) 4.92 % n/a (1) Includes amortization of issuance costs. During the three months ended June 30, 2018, the Company recognized $2,356 of interest expense on the Credit Facility. Unamortized issuance costs of $1,460 related to the Revolver are included within other noncurrent assets on the Consolidated Balance Sheet. 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.

Preferred Shares

Preferred Shares	6 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Preferred Shares	13. Preferred Shares On April 10, 2018, the Company filed a Certificate of Designations of Series A Non-Voting as-converted As described in the Certificate of Designations, the Company will not issue, and ETFS Capital does not have the right to require the Company to issue, any shares of common stock upon conversion of the Preferred Shares, if, as a result of such conversion, ETFS Capital (together with certain attribution parties) would beneficially own more than 9.99% of the Company’s outstanding common stock immediately after giving effect to such conversion. 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. The fair value of this consideration was $132,750, based on the closing price of the Company’s common stock on April 10, 2018 of $9.00 per share, the last trading day prior to the closing of the acquisition. The following is a summary of the Preferred Share balance: June 30, Issuance of Preferred Shares $ 132,750 Less: Issuance costs (181 ) Preferred Shares – carrying value $ 132,569 Temporary equity classification is required for redeemable instruments for which redemption triggers are outside of the issuer’s control. ETFS Capital has the right to redeem all the Preferred Shares specified to be converted during the period of time specified in the Certificate of Designations 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 ETFS Capital to be converted; or (b) ETFS Capital 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. 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. 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 The carrying amount of the Preferred Shares were not adjusted during the three months ended June 30, 2018 as it was not probable that they would become redeemable.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	14. 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 $ 2,432 2019 4,332 2020 3,915 2021 3,088 2022 and thereafter 21,300 Total $ 35,067 AdvisorEngine At June 30, 2018, the Company had a commitment to provide $3,000 of additional working capital to AdvisorEngine which is scheduled to be provided on September 30, 2018 if no event of default (as defined) has occurred and is continuing (See Note 8). 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	6 Months Ended
	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable Interest Entity	15. 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 June 30, 2018 December 31, Carrying Amount—Assets Preferred stock $ 25,000 $ 25,000 Note receivable—unsecured 24,588 18,748 Option 3,278 3,278 Total carrying amount—Assets $ 52,866 $ 47,026 Maximum exposure to loss $ 55,866 $ 55,026 The Company has a remaining commitment to provide working capital to AdvisorEngine of $3,000 at June 30, 2018 pursuant to the terms of the unsecured promissory note (See Note 8). The additional funding is scheduled to be provided on September 30, 2018 if no event of default (as defined) has occurred or is continuing.

Revenues from Contracts with Cu

Revenues from Contracts with Customers	6 Months Ended
	Jun. 30, 2018
Revenue from Contract with Customer [Abstract]
Revenues from Contracts with Customers	16. Revenues from Contracts with Customers The following table presents the Company’s total revenues from contracts with customers: Three Months June 30, 2018 Six Months Ended June 30, 2018 Revenues from contracts with customers: Advisory fees $ 73,778 $ 132,234 Other 997 1,445 Total operating revenues $ 74,775 $ 133,679 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 17). 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 17 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 in Note 23.

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2018
Related Party Transactions [Abstract]
Related Party Transactions	17. 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 (including certain officers of the Company) of the related parties are primarily responsible for overseeing the management and affairs of the entities for the benefit of their stakeholders 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: June 30, December 31, Receivable from WTT $ 17,035 $ 19,433 Receivable from ETFS Issuers 8,369 — Receivable from BI and WTI 957 979 Receivable from WTCS 110 97 Receivable from WTAMC 137 87 Total $ 26,608 $ 20,596 The following table summarizes revenues from advisory services provided to related parties: Three Months Ended Six Months Ended 2018 2017 2018 2017 Advisory services provided to WTT $ 52,591 $ 53,311 $ 107,792 $ 103,767 Advisory services provided to ETFS Issuers 17,720 — 17,720 — Advisory services provided to BI and WTI 2,724 2,125 5,351 4,046 Advisory services provided to WTCS 340 330 656 900 Advisory services provided to WTAMC 403 90 715 171 Total $ 73,778 $ 55,856 $ 132,234 $ 108,884 The Company also has investments in certain WisdomTree ETFs of approximately $2,588 and $1,691 at June 30, 2018 and December 31, 2017, respectively. Losses for the three and six months ended June 30, 2018 and 2017 were less than $100.

Stock-Based Awards

Stock-Based Awards	6 Months Ended
	Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Awards	18. 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. Stock-based compensation for the three months ended June 30, 2018 and 2017 was $3,529 and $3,530, respectively, and for the six months ended June 30, 2018 and 2017 was $6,838 and $6,951, respectively. A summary of unrecognized stock-based compensation expense and average remaining vesting period is as follows: June 30, 2018 Unrecognized Stock- Average Employees and directors restricted stock awards $ 19,646 1.85 A summary of stock options, restricted stock and restricted stock unit activity for the three months ended June 30, 2018 is as follows: Stock Restricted Restricted Balance at April 1, 2018 985,537 2,319,057 12,096 Granted — 173,203 — Exercised/vested (10,000 ) (145,383 ) — Forfeitures — (14,931 ) — Balance at June 30, 2018 975,537 2,331,946 12,096

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Earnings Per Share	19. Earnings Per Share The following tables set forth reconciliations of the basic and diluted earnings per share computations for the periods presented: Three Months Ended Six Months Ended Basic Earnings per Share 2018 2017 2018 2017 Net income $ 16,724 $ 12,105 $ 26,148 $ 18,985 Less: Income distributed to participating securities (513 ) (178 ) (584 ) (348 ) Less: Undistributed income allocable to participating securities (1,101 ) (19 ) (999 ) — Net income available to common stockholders $ 15,110 $ 11,908 $ 24,565 $ 18,637 Weighted average common shares (in thousands) 149,056 134,557 142,230 134,472 Basic earnings per share $ 0.10 $ 0.09 $ 0.17 $ 0.14 Three Months Ended Six Months Ended Diluted Earnings per Share 2018 2017 2018 2017 Net income $ 16,724 $ 12,105 $ 26,148 $ 18,985 Weighted Average Diluted Shares (in thousands): Weighted average common shares 149,056 134,557 142,230 134,472 Dilutive effect of common stock equivalents 14,290 1,017 7,749 1,141 Weighted average diluted shares 163,346 135,574 149,979 135,613 Diluted earnings per share $ 0.10 $ 0.09 $ 0.17 $ 0.14 Diluted earnings per share is calculated under the treasury stock and if-converted two-class

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	20. Income Taxes Effective Income Tax Rate – Three and Six Months Ended June 30, 2018 The Company’s estimated effective income tax rate for the three and six months ended June 30, 2018 of 24.6% and 27.6%, respectively, resulted in income tax expense of $5,460 and $9,958, respectively. The Company’s tax rate differs from the federal statutory tax rate of 21% primarily due to non-deductible Effective Income Tax Rate – Three and Six Months Ended June 30, 2017 The Company’s estimated effective income tax rate for the three months ended June 30, 2017 of 45.5% resulted in income tax expense of $10,120. 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 and state and local income taxes. The Company’s estimated effective income tax rate for the six months ended June 30, 2017 of 48.8% resulted in income tax expense of $18,062. 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 $5,137 at June 30, 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 June 30, 2018 and December 31, 2017 are as follows: June 30, December 31, Deferred tax assets: NOLs – Foreign $ 5,137 $ 3,841 Stock-based compensation 2,034 1,474 Deferred rent liability 1,233 1,257 NOLs – U.S. 779 909 Accrued expenses 1,410 526 Other 298 488 Deferred tax assets 10,891 8,495 Deferred tax liabilities: Unrealized gains 1,718 1,718 Fixed assets 1,527 1,498 Goodwill and intangible assets 485 388 Deferred tax liabilities 3,730 3,604 Total deferred tax assets less deferred tax liabilities 7,161 4,891 Less: valuation allowance (5,137 ) (3,841 ) Deferred tax assets, net $ 2,024 $ 1,050 Uncertain Tax Positions Tax positions are evaluated utilizing a two-step more-likely-than-not In connection with the ETFS Acquisition, the Company accrued a liability of £18,102 ($25,631) for uncertain tax positions and £3,415 ($4,835) for interest and penalties at the acquisition date. The table below sets forth the aggregate changes in the balance of gross unrecognized tax benefits: Total Unrecognized Interest Balance on January 1, 2018 $ — $ — $ — Accrued in connection with the ETFS Acquisition 30,466 25,631 4,835 Increases 37 — 37 Foreign currency translation (1) (2,164 ) (1,820 ) (344 ) Balance at June 30, 2018 $ 28,339 $ 23,811 $ 4,528 (1) The gross unrecognized tax benefits were accrued in British pounds sterling. The Company also recorded an offsetting indemnification asset provided by ETFS Capital as part of its agreement to indemnify the Company for any potential claims, for which an amount is being held in escrow. ETFS Capital has also agreed to provide additional collateral by maintaining a minimum working capital balance up to a stipulated amount. The gross unrecognized tax benefits and interest and penalties totaling $28,339 at June 30, 2018 are included in other non-current At June 30, 2018, there were $23,811 of unrecognized tax benefits that, if recognized, would impact the effective tax rate. The recognition of any unrecognized tax benefits would result in an equal and offsetting adjustment to the indemnification asset which would be recorded in income before taxes. Income Tax Examinations The Company is subject to U.S. federal income tax as well as income tax of multiple state, local and certain foreign jurisdictions. The tax return for the year ended December 31, 2016 of ManJer, the Company’s Jersey-based subsidiary, is currently under review by the relevant tax authority. The Company is indemnified by ETFS Capital for any potential exposure. The Company is not currently under audit in any other income tax jurisdictions. As of June 30, 2018, with few exceptions, the Company was no longer subject to income tax examinations by any taxing authority for years before 2014.

Shares Repurchased

Shares Repurchased	6 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Shares Repurchased	21. 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 3, the Company completed the ETFS Acquisition 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 and six months ended June 30, 2018, the Company repurchased 26,717 shares and 87,225 shares of its common stock, respectively, under this program for an aggregate cost of $272 and $1,006, respectively. During the three and six months ended June 30, 2017, the Company repurchased 7,967 shares and 354,496 shares of its common stock, respectively, under this program for an aggregate cost of $65 and $3,693, respectively. As of June 30, 2018, $87,608 remains under this program for future purchases.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	6 Months Ended
	Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	22. Goodwill and Intangible Assets Goodwill The table below sets forth goodwill by reporting unit. Goodwill allocated to the U.S. Business reporting unit is tested annually for impairment on April 30 th th Reporting Unit European Business (1) U.S. Business Total Balance at January 1, 2018 $ — $ 1,799 $ 1,799 Increases/(decreases) 84,057 — 84,057 Balance at June 30, 2018 $ 84,057 $ 1,799 $ 85,856 (1) Europe is included in the Company’s International Business reportable segment. Goodwill allocated to the U.S. Business reporting unit was tested for impairment on April 30, 2018. The fair value of the reporting unit exceeded its carrying value and therefore no impairment was recognized. European Business Reporting Unit— ETFS Acquisition As more fully disclosed in Note 3, the Company completed the ETFS Acquisition on April 11, 2018. In connection with the acquisition, the Company recognized $84,057 of goodwill which was allocated to the European Business reporting unit. The goodwill represents the value of expected synergies created from combining the 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. U.S. Business Reporting Unit— WisdomTree Continuous Commodity Index Fund Effective January 1, 2016, the Company acquired the outstanding membership interest in GreenHaven Commodity Services, LLC, the managing owner of the Greehaven Continuous Commodity Index Fund (renamed the WisdomTree Continuous Commodity Index Fund, or “GCC”). In connection with the acquisition, the Company recognized $1,799 of goodwill which was allocated to the U.S Business reporting unit. The goodwill primarily represents the potential future performance of the fund and is deductible for tax purposes. Intangible Assets (Indefinite-Lived) Advisory (ETFS) Advisory Advisory (GCC) Total Balance at January 1, 2018 $ — $ 2,132 $ 9,953 $ 12,085 Foreign currency translation — (105 ) — (105 ) Other increases/(decreases) 601,247 — — 601,247 Balance at June 30, 2018 $ 601,247 $ 2,027 $ 9,953 $ 613,227 ETFS In connection with the ETFS Acquisition which was completed on April 11, 2018 (see Note 3), the Company identified intangible assets valued at $601,247 related to the right to manage AUM through customary advisory agreements. The fair value of the intangible assets was determined using an income approach (discounted cash flow analysis) which relied upon significant unobservable inputs including a revenue growth multiple of 3% to 4% and a weighted average cost of capital of 11.6%. The intangible assets were determined to have indefinite useful lives and are not deductible for tax purposes. The Company has designated November 30 th 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 GCC 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 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	6 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
Segment Reporting	23. Segment Reporting The Company operates as an ETP sponsor and asset manager providing investment advisory services globally. These activities are reported in the Company’s U.S. Business and International Business reportable segments. The International Business reportable segment includes the results of the Company’s European operations and Canadian operations. Information concerning these reportable segments are as follows: Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 U.S. Business Segment Operating revenues Advisory fees $ 52,931 $ 53,641 $ 108,449 $ 104,667 Other income 162 128 309 231 Total operating revenues $ 53,093 $ 53,769 $ 108,758 $ 104,898 Total operating expenses $ (42,638 ) $ (35,748 ) $ (81,668 ) $ (70,178 ) Other income/(expenses) Interest expense $ (173 ) $ — $ (173 ) $ — Interest income 612 641 1,574 1,225 Settlement gain — 6,909 — 6,909 Other gains and losses, net (66 ) (261 ) (292 ) 364 Total other income/(expenses) $ 373 $ 7,289 $ 1,109 $ 8,498 Total income before taxes (U.S. Business Segment) $ 10,828 $ 25,310 $ 28,199 $ 43,218 International Business Segment (1) Operating revenues Advisory fees $ 20,847 $ 2,215 $ 23,785 $ 4,217 Other income 835 258 1,136 494 Total operating revenues $ 21,682 $ 2,473 $ 24,921 $ 4,711 Total operating expenses $ (17,606 ) $ (5,455 ) $ (24,259 ) $ (10,802 ) Other income/(expenses) Interest expense $ (2,183 ) $ — $ (2,183 ) $ — Interest income — — — — Gain on revaluation of deferred consideration 9,898 — 9,898 — Other gains and losses, net (435 ) (103 ) (470 ) (80 ) Total other income/(expenses) $ 7,280 $ (103 ) $ 7,245 $ (80 ) Total income/(loss) before taxes (International Business Segment) $ 11,356 $ (3,085 ) $ 7,907 $ (6,171 ) Income/(loss) before taxes U.S. Business segment $ 10,828 $ 25,310 $ 28,199 $ 43,218 International Business segment 11,356 (3,085 ) 7,907 (6,171 ) Total income before taxes $ 22,184 $ 22,225 $ 36,106 $ 37,047 Assets are not reported by segment as such information is not utilized by the chief operating decision maker. (1) The financial results of ETFS are included in the International Business reportable segment as of April 11, 2018.

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	24. Subsequent Events The Company evaluated subsequent events through the date of issuance of the accompanying consolidated financial statements. There were no events requiring disclosure, other than the matter below. Restructuring of Distribution Strategy in Japan As previously disclosed in Note 1, in July 2018, the Company determined to restructure its distribution strategy in Japan. As a result, the Company will close WTJ and anticipates expanding its existing relationship with a third party to manage distribution of WisdomTree ETFs in Japan. During the three months ended June 30, 2018 and 2017, WTJ reported an operating loss of $1,125 and $1,232, respectively. During the six months ended June 30, 2018 and 2017, WTJ reported an operating loss of $2,357 and $2,365, respectively.

Significant Accounting Polici31

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 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. The financial results of ETFS are included in our consolidated financial statements since the acquisition date, April 11, 2018 (See Note 3). Certain accounts in the prior years’ consolidated financial statements have been reclassified to conform to the current year’s consolidated financial statement presentation. The following table summarizes these reclassifications for the three and six months ended June 30, 2017, which had no effect on previously reported net income. Operating Revenues: Three Months Ended June 30, 2017 Six Months Ended June 30, 2017 Advisory fees (previously reported) $ 56,114 $ 109,376 Other ETP fees reclassified to Other income (258 ) (492 ) Advisory fees (currently reported) $ 55,856 $ 108,884 Settlement gain (previously reported) $ 6,909 $ 6,909 Reclassify to Other Income/(Expenses) (6,909 ) (6,909 ) Settlement gain (currently reported) $ — $ — Other income (previously reported) $ 405 $ 1,742 Other ETP fees reclassified from Advisory fees 258 492 Interest income reclassified to Other Income/(Expenses) (641 ) (1,225 ) Realized and unrealized losses reclassified to Other gains and losses, net 364 519 Miscellaneous other income reclassified to Other gains and losses, net — (803 ) Other income (currently reported) $ 386 $ 725 Total revenues (currently reported) $ 56,242 $ 109,609 Other Income/(Expenses): Interest income reclassified from operating revenues $ 641 $ 1,225 Settlement gain reclassified from operating revenues $ 6,909 $ 6,909 Other gains and losses, net (previously reported) $ — $ — Realized and unrealized losses reclassified from operating revenues (364 ) (519 ) Miscellaneous other income reclassified from operating revenues — 803 Other gains and losses, net (currently reported) $ (364 ) $ 284
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 globally. These activities are reported in the Company’s U.S. Business and International Business reportable segments. The International Business reportable segment includes the results of the Company’s European operations and Canadian operations. The financial results of ETFS are included in the International Business reportable segment as of the acquisition date.
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.
Contractual Gold Payments	Contractual Gold Payments Contractual gold payments are measured monthly based upon the average daily spot price of gold (See Note 11).
Marketing and Advertising	Marketing and Advertising Advertising costs, including media advertising and production costs, are expensed when incurred.
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.
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.
Third-Party Distribution Fees	Third-Party Distribution Fees 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.
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.
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. available-for-sale 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
Deferred Consideration	Deferred Consideration Deferred consideration represents the present value of an obligation to pay gold to a third party into perpetuity and is measured using forward-looking gold prices and a selected discount rate (See Note 5). Changes in the fair value of this obligation are reported as gain/(loss) on revaluation of deferred consideration on the Company’s Consolidated Statements of Operations.
Long-Term Debt	Long-Term Debt Long-term debt is carried at amortized cost, net of debt issuance costs. Interest expense is recognized using the effective interest method and includes amortization of debt issuance costs over the life of the debt.
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. The preferred stock issued in connection with the ETFS Acquisition (see Note 13) and unvested share-based payment awards that contain non-forfeitable two-class if-converted two-class
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 Tax positions are evaluated utilizing a two-step more-likely-than-not Non-income
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 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 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) available-for-sale available-for-sale 2016-13 2016-13 In February 2016, the FASB issued ASU 2016-02, Leases 2016-02), 2016-02 gross-up right-of-use

Significant Accounting Polici32

Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Summary of Reclassifications to Conform to the Current Year's Consolidated Financial Statement Presentation	The following table summarizes these reclassifications for the three and six months ended June 30, 2017, which had no effect on previously reported net income. Operating Revenues: Three Months Ended June 30, 2017 Six Months Ended June 30, 2017 Advisory fees (previously reported) $ 56,114 $ 109,376 Other ETP fees reclassified to Other income (258 ) (492 ) Advisory fees (currently reported) $ 55,856 $ 108,884 Settlement gain (previously reported) $ 6,909 $ 6,909 Reclassify to Other Income/(Expenses) (6,909 ) (6,909 ) Settlement gain (currently reported) $ — $ — Other income (previously reported) $ 405 $ 1,742 Other ETP fees reclassified from Advisory fees 258 492 Interest income reclassified to Other Income/(Expenses) (641 ) (1,225 ) Realized and unrealized losses reclassified to Other gains and losses, net 364 519 Miscellaneous other income reclassified to Other gains and losses, net — (803 ) Other income (currently reported) $ 386 $ 725 Total revenues (currently reported) $ 56,242 $ 109,609 Other Income/(Expenses): Interest income reclassified from operating revenues $ 641 $ 1,225 Settlement gain reclassified from operating revenues $ 6,909 $ 6,909 Other gains and losses, net (previously reported) $ — $ — Realized and unrealized losses reclassified from operating revenues (364 ) (519 ) Miscellaneous other income reclassified from operating revenues — 803 Other gains and losses, net (currently reported) $ (364 ) $ 284
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

Business Combination (Tables)

Business Combination (Tables)	6 Months Ended
	Jun. 30, 2018
Business Combinations [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 (See Note 12) 200,000 Cash on hand 53,000 Purchase price 523,000 Deferred consideration (See Note 11) 172,746 Total $ 695,746 Preliminary allocation of consideration Cash and cash equivalents 19,828 Receivables and other current assets 14,069 Intangible assets (2) 601,247 Other current liabilities (23,455 ) Fair value of net assets acquired 611,689 Preliminary goodwill resulting from the ETFS Acquisition (3) $ 84,057 (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) Represents purchase price allocated to customary advisory agreements. The fair value of the intangible assets was determined using an income approach (discounted cash flow analysis) which relied upon significant unobservable inputs including a revenue growth multiple of 3% to 4% and a weighted average cost of capital of 11.6%. 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. (3) Preliminary goodwill arising from the ETFS Acquisition represents the value of expected synergies created from combining the 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.
Summary of Operating Results of ETFS since the Acquisition Date	The Company’s Consolidated Statements of Operations include the following operating results of ETFS since the acquisition date of April 11, 2018 through June 30, 2018: Revenues: $22,934 Income before taxes: $18,102 (including a gain on revaluation of deferred consideration of $9,898)
Summary of Pro Forma Financial Information	The following table presents unaudited pro forma financial information of the Company as if the ETFS Acquisition had been consummated on January 1, 2017. The information was derived from the historical financial results of the Company and ETFS for all periods presented and was adjusted to give effect to pro forma events that are directly attributable to the acquisition, factually supportable and expected to have a continuing impact on the combined results following the acquisition. Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Revenues $ 78,025 $ 76,718 $ 157,796 $ 149,410 Net income $ 23,274 $ 15,554 $ 34,517 $ 17,451

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Summary of Categorization of Assets and Liabilities Measured at Fair Value	The tables below summarize the categorization of the Company’s assets and liabilities measured at fair value. During the three and six months ended June 2018 and 2017 there were no transfers between Levels 1, 2 and 3. June 30, 2018 Total Level 1 Level 2 Level 3 Assets: Recurring fair value measurements: Cash and cash equivalents $ 70,744 $ 70,744 $ — $ — Securities owned, at fair value 3,719 3,719 — — Total $ 74,463 $ 74,463 — $ — Non-recurring AdvisorEngine Inc. – Option (1) $ 3,278 $ — $ — $ 3,278 Thesys Group, Inc. – Series Y preferred stock (2) 6,909 — — 6,909 Total $ 10,187 $ — $ — $ 10,187 Liabilities: Recurring fair value measurements: Deferred consideration (Note 11) $ 162,848 $ — $ — $ 162,848 Securities sold, but not yet purchased 2,026 2,026 — — Total $ 164,874 $ 2,026 $ — $ 162,848 December 31, 2017 Total Level 1 Level 2 Level 3 Assets: Recurring fair value measurements: Cash and cash equivalents $ 54,193 $ 54,193 $ — $ — Securities owned, at fair value 66,294 1,691 64,603 — Total $ 120,487 $ 55,884 $ 64,603 $ — Non-recurring AdvisorEngine Inc. – Option (1) $ 3,278 — — $ 3,278 Thesys Group, Inc. – Series Y preferred stock (2) 6,909 — — 6,909 Total $ 10,187 $ — $ — $ 10,187 Liabilities: Recurring fair value measurements: Securities sold, but not yet purchased $ 950 $ 950 $ — $ — Total $ 950 $ 950 $ — $ — (1) Fair value determined on December 29, 2017 (See Note 9) (2) Fair value determined on June 20, 2017 (See Note 9)
Summary of Reconciliation of Recurring Fair Value Measurements	The following table presents a reconciliation of beginning and ending balances of recurring fair value measurements classified as Level 3: Three Months Ended Six Months Ended 2018 2017 2018 2017 Deferred consideration (See Note 11) Beginning balance (1) $ 172,746 $ — $ 172,746 $ — Net realized losses/(gains) (2) 2,715 — 2,715 — Net unrealized losses/(gains) (3) (9,898 ) — (9,898 ) — Settlements (2,715 ) — (2,715 ) — Ending balance $ 162,848 $ — $ 162,848 $ — (1) Arose in connection with the completion of the ETFS Acquisition on April 11, 2018 (See Note 3). (2) Recorded as contractual gold payments on the Company’s Consolidated Statements of Operations. (3) Recorded as gain on revaluation of deferred consideration on the Company’s Consolidated Statements of Operations.

Securities Owned_Sold but Not35

Securities Owned/Sold but Not Yet Purchased (Tables)	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Schedule of Securities Owned/Sold But Not Yet Purchased	These securities consist of securities classified as trading and available-for-sale, June 30, December 31, Securities Owned Trading securities $ 3,719 $ 1,691 Available-for-sale — 64,603 Total $ 3,719 $ 66,294 Securities Sold, but not yet Purchased Trading securities $ 2,026 $ 950 Available-for-sale — — Total $ 2,026 $ 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 available-for-sale June 30, December 31, Cost $ — $ 65,237 Gross unrealized gains in other comprehensive income — — Gross unrealized losses in other comprehensive income — (634 ) Fair value $ — $ 64,603

Securities Held-to-Maturity (Ta

Securities Held-to-Maturity (Tables)	6 Months Ended
	Jun. 30, 2018
Text Block [Abstract]
Schedule of Securities Held-to-Maturity	The following table is a summary of the Company’s securities held-to-maturity: June 30, December 31, Federal agency debt instruments (amortized cost) $ 20,229 $ 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: June 30, December 31, Cost/amortized cost $ 20,229 $ 21,299 Gross unrealized gains 5 9 Gross unrealized losses (1,950 ) (1,257 ) Fair value $ 18,284 $ 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; June 30, December 31, Due within one year $ — $ 1,000 Due one year through five years 6 11 Due five years through ten years 6,025 6,027 Due over ten years 14,198 14,261 Total $ 20,229 $ 21,299

Note Receivable (Tables)

Note Receivable (Tables)	6 Months Ended
	Jun. 30, 2018
Receivables [Abstract]
Summary of Outstanding Note Receivable Balance	The following is a summary of the outstanding note receivable balance: June 30, December 31, Note receivable (face value) $ 27,000 $ 22,000 Less: Original issue discount (“OID”), unamortized (2,970 ) (3,252 ) Plus: PIK interest 558 — Total note receivable, net $ 24,588 $ 18,748 Commitment remaining $ 3,000 $ 8,000

Investments, Carried at Cost (T

Investments, Carried at Cost (Tables)	6 Months Ended
	Jun. 30, 2018
Investments Schedule [Abstract]
Investments, Carried at Cost	The following table sets forth the Company’s investments, carried at cost: June 30, 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)	6 Months Ended
	Jun. 30, 2018
Property, Plant and Equipment [Abstract]
Schedule of Fixed Assets	The following table summarizes fixed assets: June 30, December 31, Equipment $ 2,031 $ 1,879 Furniture and fixtures 2,391 2,449 Leasehold improvements 10,882 11,037 Less: accumulated depreciation and amortization (5,276 ) (4,672 ) Total $ 10,028 $ 10,693

Long-Term Debt (Tables)

Long-Term Debt (Tables)	6 Months Ended
	Jun. 30, 2018
Debt Disclosure [Abstract]
Summary of Outstanding Borrowings under Credit Facility	The following table provides a summary of the Company’s outstanding borrowings under the Credit Facility: June 30, 2018 Term Loan Revolver Amount borrowed $ 200,000 $ — Unamortized issuance costs (6,593 ) 1,460 Carrying amount $ 193,407 $ 1,460 Effective interest rate (1) 4.92 % n/a (1) Includes amortization of issuance costs.
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

Preferred Shares (Tables)

Preferred Shares (Tables)	6 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Summary of Preferred Share Balance	The following is a summary of the Preferred Share balance: June 30, Issuance of Preferred Shares $ 132,750 Less: Issuance costs (181 ) Preferred Shares – carrying value $ 132,569

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Lease Payments	Future minimum lease payments with respect to non-cancelable Remainder of 2018 $ 2,432 2019 4,332 2020 3,915 2021 3,088 2022 and thereafter 21,300 Total $ 35,067

Variable Interest Entity (Table

Variable Interest Entity (Tables)	6 Months Ended
	Jun. 30, 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 June 30, 2018 December 31, Carrying Amount—Assets Preferred stock $ 25,000 $ 25,000 Note receivable—unsecured 24,588 18,748 Option 3,278 3,278 Total carrying amount—Assets $ 52,866 $ 47,026 Maximum exposure to loss $ 55,866 $ 55,026

Revenues from Contracts with 44

Revenues from Contracts with Customers (Tables)	6 Months Ended
	Jun. 30, 2018
Revenue from Contract with Customer [Abstract]
Summary of Revenues from Contracts with Customers	The following table presents the Company’s total revenues from contracts with customers: Three Months June 30, 2018 Six Months Ended June 30, 2018 Revenues from contracts with customers: Advisory fees $ 73,778 $ 132,234 Other 997 1,445 Total operating revenues $ 74,775 $ 133,679

Related Party Transactions (Tab

Related Party Transactions (Tables)	6 Months Ended
	Jun. 30, 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: June 30, December 31, Receivable from WTT $ 17,035 $ 19,433 Receivable from ETFS Issuers 8,369 — Receivable from BI and WTI 957 979 Receivable from WTCS 110 97 Receivable from WTAMC 137 87 Total $ 26,608 $ 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 Six Months Ended 2018 2017 2018 2017 Advisory services provided to WTT $ 52,591 $ 53,311 $ 107,792 $ 103,767 Advisory services provided to ETFS Issuers 17,720 — 17,720 — Advisory services provided to BI and WTI 2,724 2,125 5,351 4,046 Advisory services provided to WTCS 340 330 656 900 Advisory services provided to WTAMC 403 90 715 171 Total $ 73,778 $ 55,856 $ 132,234 $ 108,884

Stock-Based Awards (Tables)

Stock-Based Awards (Tables)	6 Months Ended
	Jun. 30, 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: June 30, 2018 Unrecognized Stock- Average Employees and directors restricted stock awards $ 19,646 1.85
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 June 30, 2018 is as follows: Stock Restricted Restricted Balance at April 1, 2018 985,537 2,319,057 12,096 Granted — 173,203 — Exercised/vested (10,000 ) (145,383 ) — Forfeitures — (14,931 ) — Balance at June 30, 2018 975,537 2,331,946 12,096

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2018
Earnings Per Share [Abstract]
Reconciliation of Basic and Diluted Earnings Per Share	The following tables set forth reconciliations of the basic and diluted earnings per share computations for the periods presented: Three Months Ended Six Months Ended Basic Earnings per Share 2018 2017 2018 2017 Net income $ 16,724 $ 12,105 $ 26,148 $ 18,985 Less: Income distributed to participating securities (513 ) (178 ) (584 ) (348 ) Less: Undistributed income allocable to participating securities (1,101 ) (19 ) (999 ) — Net income available to common stockholders $ 15,110 $ 11,908 $ 24,565 $ 18,637 Weighted average common shares (in thousands) 149,056 134,557 142,230 134,472 Basic earnings per share $ 0.10 $ 0.09 $ 0.17 $ 0.14 Three Months Ended Six Months Ended Diluted Earnings per Share 2018 2017 2018 2017 Net income $ 16,724 $ 12,105 $ 26,148 $ 18,985 Weighted Average Diluted Shares (in thousands): Weighted average common shares 149,056 134,557 142,230 134,472 Dilutive effect of common stock equivalents 14,290 1,017 7,749 1,141 Weighted average diluted shares 163,346 135,574 149,979 135,613 Diluted earnings per share $ 0.10 $ 0.09 $ 0.17 $ 0.14

Income Taxes (Tables)

Income Taxes (Tables)	6 Months Ended
	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Summary of Deferred Tax Assets Recorded	A summary of the components of the Company’s deferred tax assets at June 30, 2018 and December 31, 2017 are as follows: June 30, December 31, Deferred tax assets: NOLs – Foreign $ 5,137 $ 3,841 Stock-based compensation 2,034 1,474 Deferred rent liability 1,233 1,257 NOLs – U.S. 779 909 Accrued expenses 1,410 526 Other 298 488 Deferred tax assets 10,891 8,495 Deferred tax liabilities: Unrealized gains 1,718 1,718 Fixed assets 1,527 1,498 Goodwill and intangible assets 485 388 Deferred tax liabilities 3,730 3,604 Total deferred tax assets less deferred tax liabilities 7,161 4,891 Less: valuation allowance (5,137 ) (3,841 ) Deferred tax assets, net $ 2,024 $ 1,050
Schedule of Changes in Balance of Gross Unrecognized Tax Benefits	The table below sets forth the aggregate changes in the balance of gross unrecognized tax benefits: Total Unrecognized Interest Balance on January 1, 2018 $ — $ — $ — Accrued in connection with the ETFS Acquisition 30,466 25,631 4,835 Increases 37 — 37 Foreign currency translation (1) (2,164 ) (1,820 ) (344 ) Balance at June 30, 2018 $ 28,339 $ 23,811 $ 4,528 (1) The gross unrecognized tax benefits were accrued in British pounds sterling.

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Goodwill Allocated Business Reporting Unit	The table below sets forth goodwill by reporting unit. Goodwill allocated to the U.S. Business reporting unit is tested annually for impairment on April 30 th th Reporting Unit European Business (1) U.S. Business Total Balance at January 1, 2018 $ — $ 1,799 $ 1,799 Increases/(decreases) 84,057 — 84,057 Balance at June 30, 2018 $ 84,057 $ 1,799 $ 85,856 (1) Europe is included in the Company’s International Business reportable segment.
Summary of Indefinite-lived Intangible Assets	Intangible Assets (Indefinite-Lived) Advisory (ETFS) Advisory Advisory (GCC) Total Balance at January 1, 2018 $ — $ 2,132 $ 9,953 $ 12,085 Foreign currency translation — (105 ) — (105 ) Other increases/(decreases) 601,247 — — 601,247 Balance at June 30, 2018 $ 601,247 $ 2,027 $ 9,953 $ 613,227

Segment Reporting (Tables)

Segment Reporting (Tables)	6 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
Reportable Segment Information	Information concerning these reportable segments are as follows: Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 U.S. Business Segment Operating revenues Advisory fees $ 52,931 $ 53,641 $ 108,449 $ 104,667 Other income 162 128 309 231 Total operating revenues $ 53,093 $ 53,769 $ 108,758 $ 104,898 Total operating expenses $ (42,638 ) $ (35,748 ) $ (81,668 ) $ (70,178 ) Other income/(expenses) Interest expense $ (173 ) $ — $ (173 ) $ — Interest income 612 641 1,574 1,225 Settlement gain — 6,909 — 6,909 Other gains and losses, net (66 ) (261 ) (292 ) 364 Total other income/(expenses) $ 373 $ 7,289 $ 1,109 $ 8,498 Total income before taxes (U.S. Business Segment) $ 10,828 $ 25,310 $ 28,199 $ 43,218 International Business Segment (1) Operating revenues Advisory fees $ 20,847 $ 2,215 $ 23,785 $ 4,217 Other income 835 258 1,136 494 Total operating revenues $ 21,682 $ 2,473 $ 24,921 $ 4,711 Total operating expenses $ (17,606 ) $ (5,455 ) $ (24,259 ) $ (10,802 ) Other income/(expenses) Interest expense $ (2,183 ) $ — $ (2,183 ) $ — Interest income — — — — Gain on revaluation of deferred consideration 9,898 — 9,898 — Other gains and losses, net (435 ) (103 ) (470 ) (80 ) Total other income/(expenses) $ 7,280 $ (103 ) $ 7,245 $ (80 ) Total income/(loss) before taxes (International Business Segment) $ 11,356 $ (3,085 ) $ 7,907 $ (6,171 ) Income/(loss) before taxes U.S. Business segment $ 10,828 $ 25,310 $ 28,199 $ 43,218 International Business segment 11,356 (3,085 ) 7,907 (6,171 ) Total income before taxes $ 22,184 $ 22,225 $ 36,106 $ 37,047 Assets are not reported by segment as such information is not utilized by the chief operating decision maker. (1) The financial results of ETFS are included in the International Business reportable segment as of April 11, 2018.

Organizational and Description

Organizational and Description of Business- Additional Information (Detail)	6 Months Ended
	Jun. 30, 2018
Acquisition of ETFS Business [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Acquisition completion date	Apr. 11, 2018

Significant Accounting Polici52

Significant Accounting Policies - Summary of Reclassifications to Conform to the Current Year's Consolidated Financial Statement Presentation (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating Revenues:
Advisory fees		$ 55,856		$ 108,884
Settlement gain		6,909		6,909
Other income		386		725
Total revenues (currently reported)	$ 74,775	56,242	$ 133,679	109,609
Other Income/(Expenses):
Other gains and losses, net	$ (501)	(364)	$ (762)	284
Previously Reported [Member]
Operating Revenues:
Advisory fees		56,114		109,376
Settlement gain		6,909		6,909
Other income		405		1,742
Restatement Adjustment [Member] | Advisory Fees Reclassified to Other Income [Member]
Operating Revenues:
Advisory fees		(258)		(492)
Restatement Adjustment [Member] | Settlements Gain Reclassified to Other Income Expenses [Member]
Operating Revenues:
Settlement gain		(6,909)		(6,909)
Restatement Adjustment [Member] | Other Exchange Trade Product Fees Reclassified From Advisory Fees [Member]
Operating Revenues:
Other income		258		492
Restatement Adjustment [Member] | Interest Income Reclassified to Other Income Expenses [Member]
Operating Revenues:
Other income		(641)		(1,225)
Restatement Adjustment [Member] | Realized and Unrealized Losses Reclassified to Other Gains and Losses Net [Member]
Operating Revenues:
Other income		364		519
Restatement Adjustment [Member] | Miscellaneous Other Income Reclassified To Other Gains And Losses, Net [Member]
Operating Revenues:
Other income				(803)
Restatement Adjustment [Member] | Interest Income Reclassified From Operating Revenues [Member]
Other Income/(Expenses):
Other gains and losses, net		641		1,225
Restatement Adjustment [Member] | Settlement Gain Reclassified from Operating Revenues [Member]
Other Income/(Expenses):
Other gains and losses, net		6,909		6,909
Restatement Adjustment [Member] | Realized and Unrealized Losses Reclassified From Operating Revenues [Member]
Other Income/(Expenses):
Other gains and losses, net		$ (364)		(519)
Restatement Adjustment [Member] | Miscellaneous Other Income Reclassified From Operating Revenues [Member]
Other Income/(Expenses):
Other gains and losses, net				$ 803

Significant Accounting Polici53

Significant Accounting Policies - Schedule of Estimated Useful Lives of Related Assets (Detail)	6 Months Ended
	Jun. 30, 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 Polici54

Significant Accounting Policies - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Cash and cash equivalents maturity period, maximum	90 days

Business Combination - Addition

Business Combination - Additional Information (Detail) - USD ($)	Apr. 11, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Acquisition related costs		$ 7,928,000		$ 9,990,000
Gain (loss) on revaluation of deferred consideration		9,898,000		9,898,000
Acquisition of ETFS Business [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
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 shares to be issued	30,000,000
Business acquisition, number of common shares that the preferred stock is convertible into	14,750,000
Acquisition related costs		7,928,000		9,990,000
Gain (loss) on revaluation of deferred consideration		8,326,000	$ 319,000	5,771,000	$ (8,039,000)
Acquisition of ETFS Business [Member] | Term Loan Facility [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Borrowing under term loan facility	$ 200,000,000
Acquisition of ETFS Business [Member] | Revolving Credit Facility [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Revolving credit facility maximum borrowing capacity	$ 50,000,000
Acquisition of ETFS Business [Member] | 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
Acquisition of ETFS Business [Member] | Common Stock [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Business acquisition, number of shares to be issued	15,250,000
ETFS Capital Limited [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Payable to ETFS Capital Limited		$ 7,033,000		$ 7,033,000

Business Combination - Summary

Business Combination - Summary of Allocation of Preliminary Purchase Price (Detail) $ / shares in Units, $ in Thousands	Apr. 11, 2018USD ($)$ / sharesshares	Jun. 30, 2018USD ($)	Dec. 31, 2017USD ($)
Business Acquisition [Line Items]
WisdomTree stock price | $ / shares	$ 9
Goodwill		$ 85,856	$ 1,799
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 (See Note 12)	200,000
Cash on hand	53,000
Purchase price	523,000
Deferred consideration (See Note 11)	172,746
Total	695,746
Cash and cash equivalents	19,828
Receivables and other current assets	14,069
Intangible assets	601,247
Other current liabilities	(23,455)
Fair value of net assets acquired	611,689
Goodwill	$ 84,057
Preferred Stock [Member]
Business Acquisition [Line Items]
Total shares issued | shares	14,750
Preferred Stock [Member] | Acquisition of ETFS Business [Member]
Business Acquisition [Line Items]
Total shares issued | shares	14,750
Conversion ratio	1,000
Common Stock [Member]
Business Acquisition [Line Items]
Common stock equivalents | shares	14,750,000
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

Business Combination - Summar57

Business Combination - Summary of Fair Value of Intangible Assets (Parenthetical) (Detail) - Acquisition of ETFS Business [Member]	Apr. 11, 2018
Business Acquisition [Line Items]
Weighted average cost of capital percentage	11.60%
Minimum [Member]
Business Acquisition [Line Items]
Revenue growth multiple	3.00%
Maximum [Member]
Business Acquisition [Line Items]
Revenue growth multiple	4.00%

Business Combination - Summar58

Business Combination - Summary of Operating Results of ETFS since the Acquisition Date (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Business Combinations [Abstract]
Revenues:	$ 22,934
Income before taxes:	18,102
Gain on revaluation of deferred consideration	$ 9,898	$ 9,898

Business Combination - Summar59

Business Combination - Summary of Pro Forma Financial Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Business Combinations [Abstract]
Revenues	$ 78,025	$ 76,718	$ 157,796	$ 149,410
Net income	$ 23,274	$ 15,554	$ 34,517	$ 17,451

Cash and Cash Equivalents - Add

Cash and Cash Equivalents - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Cash and Cash Equivalents [Abstract]
Cash equivalents held	$ 4,701	$ 26,548
Cash and cash equivalents held at one financial institution	$ 31,805	$ 24,103

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Categorization of Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Apr. 11, 2018	Dec. 31, 2017
Liabilities:
Deferred consideration	$ 162,848	$ 172,746
Fair Value, Measurements, Recurring [Member]
Assets:
Cash and cash equivalents	70,744		$ 54,193
Securities owned, at fair value	3,719		66,294
Total	74,463		120,487
Liabilities:
Deferred consideration	162,848
Securities sold, but not yet purchased	2,026		950
Total	164,874		950
Fair Value, Measurements, Nonrecurring [Member]
Assets:
AdvisorEngine Inc. - Option	3,278		3,278
Thesys Group, Inc. - Series Y preferred stock	6,909		6,909
Total	10,187		10,187
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Cash and cash equivalents	70,744		54,193
Securities owned, at fair value	3,719		1,691
Total	74,463		55,884
Liabilities:
Securities sold, but not yet purchased	2,026		950
Total	2,026		950
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Assets:
Securities owned, at fair value			64,603
Total			64,603
Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Liabilities:
Deferred consideration	162,848
Total	162,848
Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Assets:
AdvisorEngine Inc. - Option	3,278		3,278
Thesys Group, Inc. - Series Y preferred stock	6,909		6,909
Total	$ 10,187		$ 10,187

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2018USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liquid investments, original maturities	90 days
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gold forward-looking price range	$ 1,256
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gold forward-looking price range	$ 2,839

Fair Value Measurements - Sum63

Fair Value Measurements - Summary of Reconciliation of Recurring Fair Value Measurements (Detail) - Deferred Consideration Obligation [Member] - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 172,746	$ 172,746
Net realized losses/(gains)	2,715	2,715
Net unrealized losses/(gains)	(9,898)	(9,898)
Settlements	(2,715)	(2,715)
Ending balance	$ 162,848	$ 162,848

Securities Owned_Sold but Not64

Securities Owned/Sold but Not Yet Purchased - Schedule of Securities Owned/Sold But Not Yet Purchased (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Securities Owned Total	$ 3,719	$ 66,294
Securities Sold, but not yet Purchased Total	2,026	950
Trading Securities [Member]
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Securities Owned Total	3,719	1,691
Securities Sold, but not yet Purchased Total	$ 2,026	950
Available-for-sale Debt Securities [Member]
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Securities Owned Total		$ 64,603

Securities Owned_Sold but Not65

Securities Owned/Sold but Not Yet Purchased - Schedule of Unrealized Gains, Losses and Fair Value of AFS Debt Securities (Detail) - Available-for-sale Debt Securities [Member] - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Cost		$ 65,237
Gross unrealized gains in other comprehensive income	$ 0	0
Gross unrealized losses in other comprehensive income		(634)
Fair value		$ 64,603

Securities Owned_Sold but Not66

Securities Owned/Sold but Not Yet Purchased - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Proceeds from sale and maturity of available-for-sale securities	$ 4,000	$ 25,065	$ 64,498	$ 46,065
Recognized gross realized losses	$ 23	$ 236	$ 739	$ 412

Securities Held-to-Maturity - S

Securities Held-to-Maturity - Schedule of Securities Held-to-Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Federal agency debt instruments (amortized cost)	$ 20,229	$ 21,299
Federal Agency [Member]
Schedule of Held-to-maturity Securities [Line Items]
Federal agency debt instruments (amortized cost)	$ 20,229	$ 21,299

Securities Held-to-Maturity -68

Securities Held-to-Maturity - Schedule of Unrealized Gains, Losses and Fair Value of Securities Held-to-Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Held-to-maturity cost or amortized cost	$ 20,229	$ 21,299
Held-to-maturity gross unrealized gains	5	9
Held-to-maturity gross unrealized losses	(1,950)	(1,257)
Held-to-maturity fair value	$ 18,284	$ 20,051

Securities Held-to-Maturity - A

Securities Held-to-Maturity - Additional Information (Detail) - Securities	Jun. 30, 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 -70

Securities Held-to-Maturity - Schedule of Maturity Profile of Securities Held-to-Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Held-to-maturity due within one year		$ 1,000
Held-to-maturity due one year through five years	$ 6	11
Held-to-maturity due five years through ten years	6,025	6,027
Held-to-maturity due over ten years	14,198	14,261
Held-to-maturity cost or amortized cost	$ 20,229	$ 21,299

Note Receivables - Additional I

Note Receivables - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 29, 2017	Jun. 30, 2018	Jun. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest rate	5.00%	5.00%	5.00%
Percentage of interest rate increase at the event of default	10.00%	10.00%	10.00%
Promissory note maturity date			Dec. 29, 2021
Interest income recognized		$ 421	$ 840
AdvisorEngine [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aggregate commitment amount	$ 30,000
Current funding amount		27,000	27,000
Remaining commitment amount		3,000	3,000
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	$ 3,278

Note Receivables - Summary of O

Note Receivables - Summary of Outstanding Note Receivable Balance (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total note receivable, net	$ 24,588	$ 18,748
Notes Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Note receivable (face value)	27,000	22,000
Less: Original issue discount ("OID"), unamortized	(2,970)	(3,252)
Plus: PIK interest	558
Total note receivable, net	24,588	18,748
Commitment remaining	$ 3,000	$ 8,000

Investments, Carried at Cost -

Investments, Carried at Cost - Details of Investments Carried at Cost (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Nov. 18, 2016
Investment [Line Items]
Investments, carried at cost	$ 35,187	$ 35,187
AdvisorEngine [Member] | Convertible Preferred Stock [Member]
Investment [Line Items]
Investments, carried at cost	25,000	25,000	$ 20,000
AdvisorEngine [Member] | Equity Option [Member]
Investment [Line Items]
Investments, carried at cost	3,278	3,278
Thesys Group, Inc [Member]
Investment [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	Jun. 30, 2018	Dec. 31, 2017	Apr. 27, 2017	Nov. 18, 2016
Investment [Line Items]
Cost method investments				$ 35,187,000	$ 35,187,000
Equity Option [Member]
Investment [Line Items]
Impairment losses				$ 0	0
Latest closing date of acquisition, if option is exercised	Jan. 15, 2019
Weighted average cost of capital percentage	27.00%
Equity Option [Member] | Measurement Input, Option Volatility [Member]
Investment [Line Items]
Option volatility rate	40.00%
AdvisorEngine [Member]
Investment [Line Items]
Date of agreement			Nov. 18, 2016
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]
Investment [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]
Investment [Line Items]
Cost method investments				$ 25,000,000	25,000,000		$ 20,000,000
AdvisorEngine [Member] | Convertible Preferred Stock [Member] | Series A Preferred Stock [Member]
Investment [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]
Investment [Line Items]
Cost method investments						$ 5,000,000
Number of shares purchased						2,646,062
Thesys Group, Inc [Member]
Investment [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]
Investment [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]
Investment [Line Items]
Warrant exercisable term		5 years
Qualified financing determined term		2 years
Thesys Group, Inc [Member] | Warrant [Member] | Series Y Preferred Stock [Member]
Investment [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	Jun. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Less accumulated depreciation and amortization	$ (5,276)	$ (4,672)
Total	10,028	10,693
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	2,031	1,879
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	2,391	2,449
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	$ 10,882	$ 11,037

Deferred Consideration - Additi

Deferred Consideration - Additional Information (Detail)	3 Months Ended	6 Months Ended
	Jun. 30, 2018USD ($)oz	Jun. 30, 2018USD ($)oz	Apr. 11, 2018USD ($)
Business Acquisition [Line Items]
Fixed payments ounces of gold per year | oz	9,500	9,500
Upfront consideration paid		$ 0
Deferred consideration	$ 162,848,000	162,848,000	$ 172,746,000
Deferred consideration, current	11,378,000	11,378,000
Deferred consideration, non-current	151,470,000	$ 151,470,000
Discount rate used to value the deferred consideration		10.00%
Contractual gold payments	2,715,000	$ 2,715,000
Gain/loss on revaluation of deferred consideration	$ 9,898,000	$ 9,898,000
April 1, 2018 through March 31, 2058 [Member]
Business Acquisition [Line Items]
Fixed payments ounces of gold per year | oz	9,500	9,500
April 1, 2058 and Thereafter [Member]
Business Acquisition [Line Items]
Fixed payments ounces of gold per year | oz	6,333	6,333

Long-Term Debt - Additional Inf

Long-Term Debt - Additional Information (Detail) - USD ($)	Apr. 11, 2018	Jun. 30, 2018	Jun. 30, 2018
Debt Instrument [Line Items]
Proceeds from term loan			$ 200,000,000
Interest expense		$ 2,356,000	2,356,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Unamortized issuance costs		$ 1,460,000	$ 1,460,000
Acquisition of ETFS Business [Member] | Term Loan Facility [Member]
Debt Instrument [Line Items]
Proceeds from term loan	$ 200,000,000
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
Acquisition of ETFS Business [Member] | Term Loan Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	1.75%
Acquisition of ETFS Business [Member] | Term Loan Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	2.00%
Acquisition of ETFS Business [Member] | Revolving Credit Facility [Member]
Debt Instrument [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
Debt instrument, facility fee rate	0.50%
Acquisition of ETFS Business [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	1.25%
Acquisition of ETFS Business [Member] | Revolving Credit Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	1.50%

Long-Term Debt - Summary of Out

Long-Term Debt - Summary of Outstanding Borrowings under Credit Facility (Detail) $ in Thousands	Jun. 30, 2018USD ($)
Term Loan Facility [Member]
Debt Instrument [Line Items]
Amount borrowed	$ 200,000
Unamortized issuance costs	(6,593)
Carrying amount	$ 193,407
Effective interest rate	4.92%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Unamortized issuance costs	$ 1,460
Carrying amount	$ 1,460

Long-Term Debt - Summary of Fin

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

Preferred Shares - Additional I

Preferred Shares - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	Apr. 11, 2018	Jun. 30, 2018
Class of Stock [Line Items]
Fair value of preferred stock consideration	$ 132,750
Acquisition price per share	$ 9
Preferred Stock [Member]
Class of Stock [Line Items]
Shares issued in business acquisition	14,750
Common Stock [Member]
Class of Stock [Line Items]
Common stock equivalents	14,750,000
Acquisition of ETFS Business [Member]
Class of Stock [Line Items]
Shares issued in business acquisition	30,000,000
Acquisition price per share	$ 9
Other redemption rights unrelated to stockholder approval		Temporary equity classification is required for redeemable instruments for which redemption triggers are outside of the issuer’s control. ETFS Capital has the right to redeem all the Preferred Shares specified to be converted during the period of time specified in the Certificate of Designations 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 ETFS Capital to be converted; or (b) ETFS Capital 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. 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. 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 ETFS Capital exercises such redemption right.
Acquisition of ETFS Business [Member] | Preferred Stock [Member]
Class of Stock [Line Items]
Shares issued in business acquisition	14,750
Acquisition of ETFS Business [Member] | Common Stock [Member]
Class of Stock [Line Items]
Shares issued in business acquisition	15,250,000
Common stock equivalents	14,750,000

Preferred Shares - Summary of P

Preferred Shares - Summary of Preferred Share Balance (Detail) - Series A Preferred Stock [Member] $ in Thousands	Jun. 30, 2018USD ($)
Preferred Units [Line Items]
Issuance of Preferred Shares	$ 132,750
Less: Issuance costs	(181)
Preferred Shares - carrying value	$ 132,569

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Commitments And Contingencies [Line Items]
Operating leases expenses	$ 1,289	$ 1,030	$ 2,316	$ 2,150
Standby letter of credit	1,384		1,384
AdvisorEngine [Member]
Commitments And Contingencies [Line Items]
Remaining commitment amount	$ 3,000		$ 3,000

Commitments and Contingencies83

Commitments and Contingencies - Schedule of Future Minimum Lease Payments (Detail) $ in Thousands	Jun. 30, 2018USD ($)
Commitments and Contingencies Disclosure [Abstract]
Remainder of 2018	$ 2,432
2,019	4,332
2,020	3,915
2,021	3,088
2022 and thereafter	21,300
Total	$ 35,067

Variable Interest Entity - Summ

Variable Interest Entity - Summary of Information about Variable Interests (Detail) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Carrying Amount - Assets
Preferred stock	$ 25,000,000	$ 25,000,000
Note receivable - unsecured	24,588,000	18,748,000
Option	3,278,000	3,278,000
Total carrying amount - Assets	52,866,000	47,026,000
Maximum exposure to loss	$ 55,866,000	$ 55,026,000

Variable Interest Entity - Addi

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

Revenues from Contracts with 86

Revenues from Contracts with Customers - Summary of Revenues from Contracts with Customers (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items]
Total operating revenues	$ 74,775	$ 56,242	$ 133,679	$ 109,609
Advisory Fees [Member]
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items]
Total operating revenues	73,778	55,856	132,234	108,884
Other Income [Member]
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items]
Total operating revenues	$ 997	$ 386	$ 1,445	$ 725

Revenues from Contracts with 87

Revenues from Contracts with Customers - Additional Information (Detail) - Advisory Fees [Member]	Jun. 30, 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	Jun. 30, 2018	Dec. 31, 2017
Related Party Transaction [Line Items]
Accounts receivable from related parties	$ 26,608	$ 20,596
WisdomTree Trust [Member]
Related Party Transaction [Line Items]
Accounts receivable from related parties	17,035	19,433
ETFS Issuers [Member]
Related Party Transaction [Line Items]
Accounts receivable from related parties	8,369
Boost Issuer PLC And WisdomTree Issuer plc [Member]
Related Party Transaction [Line Items]
Accounts receivable from related parties	957	979
WisdomTree Commodity Services LLC [Member]
Related Party Transaction [Line Items]
Accounts receivable from related parties	110	97
WisdomTree Asset Management Canada, Inc [Member]
Related Party Transaction [Line Items]
Accounts receivable from related parties	$ 137	$ 87

Related Party Transactions - 89

Related Party Transactions - Summary of Revenues from Advisory Services Provided to Related Parties (Detail) - Advisory Services [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Related Party Transaction [Line Items]
Revenue from related parties	$ 73,778	$ 55,856	$ 132,234	$ 108,884
WisdomTree Trust [Member]
Related Party Transaction [Line Items]
Revenue from related parties	52,591	53,311	107,792	103,767
ETFS Issuers [Member]
Related Party Transaction [Line Items]
Revenue from related parties	17,720		17,720
Boost Issuer PLC And WisdomTree Issuer plc [Member]
Related Party Transaction [Line Items]
Revenue from related parties	2,724	2,125	5,351	4,046
WisdomTree Commodity Services LLC [Member]
Related Party Transaction [Line Items]
Revenue from related parties	340	330	656	900
WisdomTree Asset Management Canada, Inc [Member]
Related Party Transaction [Line Items]
Revenue from related parties	$ 403	$ 90	$ 715	$ 171

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - WisdomTree ETF [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Related Party Transaction [Line Items]
Investment	$ 2,588		$ 2,588		$ 1,691
Maximum [Member]
Related Party Transaction [Line Items]
Loss on investment	$ (100)	$ (100)	$ (100)	$ (100)

Stock-Based Awards - Additional

Stock-Based Awards - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 20, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 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		$ 3,529	$ 3,530	$ 6,838	$ 6,951

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	6 Months Ended
	Jun. 30, 2018USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average Remaining Vesting Period	1 year 10 months 6 days
Unrecognized Stock-Based Compensation	$ 19,646

Stock-Based Awards - Summary 93

Stock-Based Awards - Summary of Stock Options, Restricted Stock and Restricted Stock Unit Activity (Detail)	3 Months Ended
	Jun. 30, 2018shares
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, beginning balance	985,537
Options, Granted	0
Options, Exercised/vested	(10,000)
Options, Forfeitures	0
Options, ending balance	975,537
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock, beginning balance	2,319,057
Restricted Stock, Granted	173,203
Restricted Stock, Exercised/vested	(145,383)
Restricted Stock, Forfeitures	(14,931)
Restricted Stock, ending balance	2,331,946
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock, beginning balance	12,096
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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Net income	$ 16,724	$ 12,105	$ 26,148	$ 18,985
Less: Income distributed to participating securities	(513)	(178)	(584)	(348)
Less: Undistributed income allocable to participating securities	(1,101)	(19)	(999)
Net income available to common stockholders	$ 15,110	$ 11,908	$ 24,565	$ 18,637
Weighted average common shares (in thousands)	149,056	134,557	142,230	134,472
Basic earnings per share	$ 0.10	$ 0.09	$ 0.17	$ 0.14
Net income	$ 16,724	$ 12,105	$ 26,148	$ 18,985
Weighted average common shares	149,056	134,557	142,230	134,472
Dilutive effect of common stock equivalents	14,290	1,017	7,749	1,141
Weighted average diluted shares	163,346	135,574	149,979	135,613
Diluted earnings per share	$ 0.10	$ 0.09	$ 0.17	$ 0.14

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Detail) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Anti-dilutive common stock equivalents excluded from calculation of diluted earnings per share	869,288	1,951,683	1,140,659	1,780,397

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) € in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018USD ($)	Jun. 30, 2017USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2017USD ($)	Apr. 11, 2018USD ($)	Apr. 11, 2018EUR (€)
Schedule Of Income Tax [Line Items]
Estimated effective rate	24.60%	45.50%	27.60%	48.80%
Income tax expense	$ 5,460	$ 10,120	$ 9,958	$ 18,062
Federal statutory rate	21.00%		21.00%
Pre-tax federal net operating losses	$ 3,147		$ 3,147
Pre-tax federal net operating losses expiration date			2,024
Tax effected NOLs - Foreign			$ 5,137
Unrecognized tax benefits that would impact effective tax rate	23,811		$ 23,811
Jersey [Member]
Schedule Of Income Tax [Line Items]
Estimated effective rate			0.00%
Income tax holiday, description			The gain on revaluation is not adjusted for income taxes as the obligation was assumed by a wholly-owned subsidiary of ours that is based in Jersey, a region where we are subject to a zero percent tax rate.
Other Noncurrent Liabilities [Member]
Schedule Of Income Tax [Line Items]
Accrued for unrecognized tax benefits and interest/penalties related to a tax position claimed or expected to be claimed on a tax return	$ 28,339		$ 28,339
Acquisition of ETFS Business [Member]
Schedule Of Income Tax [Line Items]
Accrued uncertain tax position liability					$ 25,631	€ 18,102
Interest and penalties					$ 4,835	€ 3,415

Income Taxes - Summary of Defer

Income Taxes - Summary of Deferred Tax Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Deferred tax assets:
NOLs - Foreign	$ 5,137	$ 3,841
Stock-based compensation	2,034	1,474
Deferred rent liability	1,233	1,257
NOLs - U.S.	779	909
Accrued expenses	1,410	526
Other	298	488
Deferred tax assets	10,891	8,495
Deferred tax liabilities:
Unrealized gains	1,718	1,718
Fixed assets	1,527	1,498
Goodwill and intangible assets	485	388
Deferred tax liabilities	3,730	3,604
Total deferred tax assets less deferred tax liabilities	7,161	4,891
Less: valuation allowance	(5,137)	(3,841)
Deferred tax assets, net	$ 2,024	$ 1,050

Income Taxes - Schedule of Chan

Income Taxes - Schedule of Changes in Balance of Gross Unrecognized Tax Benefits (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2018USD ($)
Income Tax Contingency [Line Items]
Accrued in connection with the ETFS acquisition	$ 30,466
Increases	37
Foreign currency translation	(2,164)
Ending balance	28,339
Unrecognized Tax Benefits [Member]
Income Tax Contingency [Line Items]
Accrued in connection with the ETFS acquisition	25,631
Foreign currency translation	(1,820)
Ending balance	23,811
Interest and Penalties [Member]
Income Tax Contingency [Line Items]
Accrued in connection with the ETFS acquisition	4,835
Increases	37
Foreign currency translation	(344)
Ending balance	$ 4,528

Shares Repurchased - Additional

Shares Repurchased - Additional Information (Detail) - USD ($)	Apr. 27, 2016	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Apr. 11, 2018	Oct. 29, 2014
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		26,717	7,967	87,225	354,496
Repurchased common stock, value		$ 272,000	$ 65,000	$ 1,006,000	$ 3,693,000
Dollar amount remaining available for future share repurchases		$ 87,608,000		$ 87,608,000

Goodwill and Intangible Asse100

Goodwill and Intangible Assets - Summary of Goodwill by Reporting Unit (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2018USD ($)
Goodwill [Line Items]
Beginning balance	$ 1,799
Increases/(decreases)	84,057
Ending balance	85,856
Reportable Subsegments [Member] | European Business Segment [Member]
Goodwill [Line Items]
Increases/(decreases)	84,057
Ending balance	84,057
Reportable Subsegments [Member] | U.S. Business segment [Member]
Goodwill [Line Items]
Beginning balance	1,799
Ending balance	$ 1,799

Goodwill and Intangible Asse101

Goodwill and Intangible Assets - Additional Information (Detail) $ in Thousands, $ in Thousands	Apr. 30, 2018USD ($)	Apr. 11, 2018USD ($)	Dec. 31, 2017USD ($)Fund	Dec. 31, 2017CAD ($)Fund	Jun. 30, 2018USD ($)	Jan. 01, 2016USD ($)
Indefinite-lived Intangible Assets [Line Items]
Intangible asset related to its customary advisory agreement			$ 12,085		$ 613,227
U.S. Business segment [Member]
Indefinite-lived Intangible Assets [Line Items]
Goodwill, impairment loss	$ 0
Questrade ETFs [Member]
Indefinite-lived Intangible Assets [Line Items]
Intangible asset related to its customary advisory agreement			$ 2,132		2,027
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
Business acquisition, cash paid			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
GreenHaven Commodity Services, LLC [Member] | U.S. Business segment [Member]
Indefinite-lived Intangible Assets [Line Items]
Goodwill acquired					$ 1,799
Acquisition of ETFS Business [Member]
Indefinite-lived Intangible Assets [Line Items]
Acquisition completion date					Apr. 11, 2018
Goodwill acquired					$ 84,057
Intangible asset related to its customary advisory agreement					$ 601,247
Weighted average cost of capital percentage		11.60%
Business acquisition, cash paid		$ 253,000
Acquisition of ETFS Business [Member] | Minimum [Member]
Indefinite-lived Intangible Assets [Line Items]
Revenue growth multiple		3.00%
Acquisition of ETFS Business [Member] | Maximum [Member]
Indefinite-lived Intangible Assets [Line Items]
Revenue growth multiple		4.00%

Goodwill and Intangible Asse102

Goodwill and Intangible Assets - Summary of Indefinite-lived Intangible Assets (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2018USD ($)
Indefinite-lived Intangible Assets [Line Items]
Beginning balance	$ 12,085
Foreign currency translation	(105)
Other increases/(decreases)	601,247
Ending balance	613,227
Acquisition of ETFS Business [Member]
Indefinite-lived Intangible Assets [Line Items]
Other increases/(decreases)	601,247
Ending balance	601,247
GreenHaven Commodity Services, LLC [Member]
Indefinite-lived Intangible Assets [Line Items]
Beginning balance	9,953
Ending balance	9,953
Questrade ETFs [Member]
Indefinite-lived Intangible Assets [Line Items]
Beginning balance	2,132
Foreign currency translation	(105)
Ending balance	$ 2,027

Segment Reporting - Reportable

Segment Reporting - Reportable Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Operating revenues
Total revenues	$ 74,775	$ 56,242	$ 133,679	$ 109,609
Total operating expenses	(60,244)	(41,203)	(105,927)	(80,980)
Other income/(expenses)
Interest expense	(2,356)		(2,356)
Settlement gain		6,909		6,909
Gain on revaluation of deferred consideration	9,898		9,898
Other gains and losses, net	(501)	(364)	(762)	284
Income before taxes	22,184	22,225	36,106	37,047
Advisory Fees [Member]
Operating revenues
Total revenues	73,778	55,856	132,234	108,884
U.S. Business segment [Member]
Operating revenues
Other income	162	128	309	231
Total revenues	53,093	53,769	108,758	104,898
Total operating expenses	(42,638)	(35,748)	(81,668)	(70,178)
Other income/(expenses)
Interest expense	(173)		(173)
Interest income	612	641	1,574	1,225
Settlement gain		6,909		6,909
Other gains and losses, net	(66)	(261)	(292)	364
Total other income/(expenses)	373	7,289	1,109	8,498
Income before taxes	10,828	25,310	28,199	43,218
U.S. Business segment [Member] | Advisory Fees [Member]
Operating revenues
Total revenues	52,931	53,641	108,449	104,667
International Business Segment [Member]
Operating revenues
Other income	835	258	1,136	494
Total revenues	21,682	2,473	24,921	4,711
Total operating expenses	(17,606)	(5,455)	(24,259)	(10,802)
Other income/(expenses)
Interest expense	(2,183)		(2,183)
Gain on revaluation of deferred consideration	9,898		9,898
Other gains and losses, net	(435)	(103)	(470)	(80)
Total other income/(expenses)	7,280	(103)	7,245	(80)
Income before taxes	11,356	(3,085)	7,907	(6,171)
International Business Segment [Member] | Advisory Fees [Member]
Operating revenues
Total revenues	$ 20,847	$ 2,215	$ 23,785	$ 4,217

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Subsequent Event [Line Items]
Operating income (loss)	$ 14,531	$ 15,039	$ 27,752	$ 28,629
WisdomTree Japan [Member]
Subsequent Event [Line Items]
Operating income (loss)	$ (1,125)	$ (1,232)	$ (2,357)	$ (2,365)