WisdomTree (WT) 10-Q9 May 192019 Q1 Quarterly reportFinancial data

Company Profile

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2019	Apr. 26, 2019
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Trading Symbol	WETF
Entity Registrant Name	WisdomTree Investments, Inc.
Entity Central Index Key	0000880631
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		155,053,303

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 78,942	$ 77,784
Securities owned, at fair value	6,419	8,873
Accounts receivable	28,136	25,834
Income taxes receivable	1,770	1,181
Prepaid expenses	4,037	4,441
Other current assets	164	163
Total current assets	119,468	118,276
Fixed assets, net	8,863	9,122
Note receivable, net (Note 8)	29,317	28,722
Indemnification receivable (Note 21)	31,593	34,876
Securities held-to-maturity	20,159	20,180
Deferred tax assets, net	3,998	7,042
Investments, carried at cost (Note 9)	28,080	28,080
Right of use assets – operating leases (Note 14)	19,446
Goodwill (Note 23)	85,856	85,856
Intangible assets (Note 23)	603,251	603,209
Other noncurrent assets	1,486	2,155
Total assets	951,517	937,518
Current liabilities:
Fund management and administration payable	26,921	22,508
Compensation and benefits payable	9,214	18,453
Deferred consideration – gold payments (Note 11)	11,857	11,765
Securities sold, but not yet purchased, at fair value	1,338	1,698
Operating lease liabilities (Note 14)	3,651
Accounts payable and other liabilities	9,772	8,377
Total current liabilities	62,753	62,801
Long-term debt (Note 12)	195,174	194,592
Deferred consideration – gold payments (Note 11)	145,290	149,775
Operating lease liabilities (Note 14)	20,704
Deferred rent payable		4,570
Other noncurrent liabilities (Note 21)	31,593	34,876
Total liabilities	455,514	446,614
Contingencies (Note 15)
Stockholders' equity
Preferred stock, par value $0.01; 2,000 shares authorized:
Common stock, par value $0.01; 250,000 shares authorized; issued and outstanding: 155,056 and 153,202 at March 31, 2019 and December 31, 2018, respectively	1,551	1,532
Additional paid-in capital	364,717	363,655
Accumulated other comprehensive income	758	467
Accumulated deficit	(3,592)	(7,319)
Total stockholders' equity	363,434	358,335
Total liabilities and stockholders' equity	951,517	937,518
Series A Preferred Stock [Member]
Current liabilities:
Preferred stock – Series A Non-Voting Convertible, par value $0.01; 14.750 shares authorized, issued and outstanding (Note 13)	$ 132,569	$ 132,569

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2019	Dec. 31, 2018
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	155,056,000	153,202,000
Common stock, shares outstanding	155,056,000	153,202,000
Series A Preferred Stock [Member]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	14,750	14,750
Preferred stock, shares issued	14,750	14,750
Preferred stock, shares outstanding	14,750	14,750

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Revenues:
Total revenues	$ 65,485	$ 58,904
Operating Expenses:
Compensation and benefits	21,301	18,832
Fund management and administration	15,166	10,912
Marketing and advertising	2,680	3,195
Sales and business development	4,422	3,813
Contractual gold payments (Note 11)	3,098
Professional and consulting fees	1,482	1,636
Occupancy, communications and equipment	1,618	1,363
Depreciation and amortization	269	355
Third-party distribution fees	2,400	1,725
Acquisition-related costs (Note 3)	313	2,062
Other	2,053	1,790
Total expenses	54,802	45,683
Operating income	10,683	13,221
Other Income/(Expenses):
Interest expense	(2,892)
Gain on revaluation of deferred consideration – gold payments (Note 11)	4,404
Interest income	779	962
Impairment (Note 14)	(572)
Other losses, net	(4,627)	(261)
Income before taxes	7,775	13,922
Income tax (benefit)/expense	(1,049)	4,498
Net income	$ 8,824	$ 9,424
Earnings per share—basic	$ 0.05	$ 0.07
Earnings per share—diluted	$ 0.05	$ 0.07
Weighted-average common shares—basic	151,625	135,329
Weighted-average common shares—diluted	166,811	136,468
Cash dividends declared per common share	$ 0.03	$ 0.03
Advisory Fees [Member]
Operating Revenues:
Total revenues	$ 64,840	$ 58,456
Other Income [Member]
Operating Revenues:
Total revenues	$ 645	$ 448

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 8,824	$ 9,424
Other comprehensive income
Change in unrealized gains on available-for-sale debt securities, net of tax	0	460
Foreign currency translation adjustment	291	412
Other comprehensive income	291	872
Comprehensive income	$ 9,115	$ 10,296

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Income [Member]	Accumulated Deficit [Member]
Balance at Dec. 31, 2017	$ 192,951	$ 1,370	$ 216,006	$ 291	$ (24,716)
Balance, shares at Dec. 31, 2017		136,996,000
Restricted stock issued and vesting of restricted stock units, net		$ 7	(7)
Restricted stock issued and vesting of restricted stock units net, shares		667,000
Shares repurchased	(734)		(734)
Shares repurchased, shares		(60,000)
Exercise of stock options, net	54	$ 1	53
Exercise of stock options net, shares		148,000
Stock-based compensation	3,309		3,309
Stock issuance costs	(139)		(139)
Other comprehensive income	872			872
Dividends	(4,132)				(4,132)
Net income	9,424				9,424
Balance at Mar. 31, 2018	201,605	$ 1,378	218,488	1,163	(19,424)
Balance, shares at Mar. 31, 2018		137,751,000
Balance at Dec. 31, 2018	$ 358,335	$ 1,532	363,655	467	(7,319)
Balance, shares at Dec. 31, 2018	153,202,000	153,202,000
Restricted stock issued and vesting of restricted stock units, net		$ 21	(21)
Restricted stock issued and vesting of restricted stock units net, shares		2,145,000
Shares repurchased	$ (2,005)	$ (2)	(2,003)
Shares repurchased, shares		(311,000)
Exercise of stock options, net	14		14
Exercise of stock options net, shares		20,000
Stock-based compensation	3,072		3,072
Other comprehensive income	291			291
Dividends	(5,097)				(5,097)
Net income	8,824				8,824
Balance at Mar. 31, 2019	$ 363,434	$ 1,551	$ 364,717	$ 758	$ (3,592)
Balance, shares at Mar. 31, 2019	155,056,000	155,056,000

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 8,824	$ 9,424
Adjustments to reconcile net income to net cash provided by/(used in) operating activities:
Advisory fees received in gold and other precious metals	(11,389)
Gain on revaluation of deferred consideration	(4,404)
Contractual gold payments	3,098
Stock-based compensation	3,072	3,309
Deferred income taxes	3,048	(136)
Amortization of right of use asset	798
Amortization of credit facility issuance costs	711
Paid-in-kind interest income (Note 8)	(595)	(416)
Impairment	572
Depreciation and amortization	269	355
Other	3	661
Changes in operating assets and liabilities:
Securities owned, at fair value	2,454	1,106
Accounts receivable	(1,939)	606
Income taxes receivable/payable	(604)	4,297
Prepaid expenses	419	(360)
Gold and other precious metals	7,975
Other assets	182	160
Fund management and administration payable	4,274	(1,744)
Compensation and benefits payable	(9,250)	(22,003)
Securities sold, but not yet purchased, at fair value	(360)	(950)
Operating lease liabilities	(881)
Accounts payable and other liabilities	1,575	855
Net cash provided by/(used in) operating activities	7,852	(4,836)
Cash flows from investing activities:
Purchase of fixed assets	(7)	(17)
Proceeds from held-to-maturity securities maturing or called prior to maturity	18	32
Proceeds from sales and maturities of debt securities available-for-sale		60,498
Net cash provided by investing activities	11	60,513
Cash flows from financing activities:
Dividends paid	(5,097)	(4,132)
Shares repurchased	(2,005)	(734)
Proceeds from exercise of stock options	14	54
Net cash used in financing activities	(7,088)	(4,812)
Increase in cash flow due to changes in foreign exchange rate	383	593
Net increase in cash and cash equivalents	1,158	51,458
Cash and cash equivalents—beginning of period	77,784	54,193
Cash and cash equivalents—end of period	78,942	105,651
Supplemental disclosure of cash flow information:
Cash paid for taxes	707	$ 339
Cash paid for interest	$ 2,224

Consolidated Statements of Ca_2

Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
Right of use asset	$ 19,446	$ 19,827
Operating lease liabilities	$ 24,355	$ 24,817

Organization and Description of

Organization and Description of Business	3 Months Ended
Organization and Description of Business	Mar. 31, 2019
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, commodity, fixed income, leveraged and inverse, currency and alternative strategies. The Company has the following wholly-owned operating subsidiaries: • WisdomTree Asset Management, Inc. is a New York based investment adviser registered with the SEC, providing investment advisory and other management services to the WisdomTree Trust (“WTT”) and WisdomTree exchange-traded funds (“ETFs”). The WisdomTree ETFs are issued in the U.S. by WTT. WTT, a non-consolidated third party, is a Delaware statutory trust registered with the SEC as an open-end management investment company. The Company has licensed to WTT the use of certain of its own indexes on an exclusive basis for the WisdomTree ETFs in the U.S. • ETFS Management Company (Jersey) Limited (“ManJer”) is a Jersey based management company providing management services to nine issuers (the “ETFS Issuers”) in respect of the ETPs issued and listed by the ETFS Issuers covering commodity, currency and leveraged-and-inverse strategies. • Boost Management Limited (“BML”) is a Jersey based management company providing management services to Boost Issuer PLC (“BI”) in respect of the Boost ETPs issued by BI. BI, a non-consolidated third party, is a public limited company domiciled in Ireland. • WisdomTree Management Limited (“WML”) • WisdomTree UK Limited (“WTUK”) • WisdomTree Europe Limited is a U.K. based company which is the legacy distributor of the Boost ETPs and WisdomTree UCITS ETFs. These services are now provided directly by WTUK. WisdomTree Europe Limited is no longer regulated and does not provide any regulated services. • WisdomTree Ireland Limited is an Ireland based company authorized by the Central Bank of Ireland providing distribution services to ManJer, BML and WML. • WisdomTree Asset Management Canada, Inc. (“WTAMC”) is a Canada based investment fund manager registered with the Ontario Securities Commission providing fund management services to locally-listed WisdomTree Canadian ETFs. • WisdomTree Commodity Services, LLC (“WTCS”) is a New York based company that serves as the managing owner and commodity pool operator of the WisdomTree Continuous Commodity Index Fund. WTCS is registered with the Commodity Futures Trading Commission and is a member of the National Futures Association. Acquisition of ETFS On April 11, 2018 Restructuring of Distribution Strategy in Japan In July 2018, the Company determined to restructure its distribution strategy in Japan and has expanded its existing relationship with Premia Partners Company Limited to manage distribution of the Company’s ETFs in Japan. As a result, WisdomTree Japan Inc. (“WTJ”) has ceased operations and is in the process of being liquidated. During the three months ended March 31, 2019 and 2018, WTJ reported an operating loss of $430 and $1,232, respectively. WTJ also recognized an impairment expense of $572 in connection with the termination of its office lease on March 31, 2019.

Significant Accounting Policies

Significant Accounting Policies	3 Months Ended
Significant Accounting Policies	Mar. 31, 2019
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 the Company’s consolidated financial statements since the acquisition date, April 11, 2018 (See Note 3). Certain accounts in the consolidated financial statements for the three months ended March 31, 2018 have been reclassified to conform to the current year’s consolidated financial statement presentation. The following table summarizes these reclassifications which had no effect on previously reported net income. Operating Revenues: Three Months Ended March 31, 2018 Advisory fees (previously reported) $ 58,756 Other ETP fees reclassified to Other income (300 ) Advisory fees (currently reported) $ 58,456 Other income (previously reported) $ 849 Other ETP fees reclassified from Advisory fees 300 Interest income reclassified to Other Income/(Expenses) (962 ) Realized and unrealized losses reclassified to Other losses, net 261 Other income (currently reported) $ 448 Total revenues (currently reported) $ 58,904 Other Income/(Expenses): Interest income reclassified from operating revenues $ 962 Other losses, net (previously reported) $ — Realized and unrealized losses reclassified from operating revenues (261 ) Other losses, net (currently reported) $ (261 ) 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 and paid 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. 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. These securities are recorded on their trade date and are measured at fair value. All equity securities are classified by the Company as trading. Debt securities are classified based primarily on the Company’s intent to hold or sell the security. Changes in the fair value of securities classified as trading are reported in other income in the period the change occurs. Unrealized gains and losses of securities classified as available-for-sale are included in other comprehensive income. Once sold, amounts reclassified out of accumulated other comprehensive income and into earnings are determined using the specific identification method. Available-for-sale securities are assessed for impairment on a quarterly basis. Securities Held-to-Maturity The Company accounts for certain of its investments as held-to-maturity on a trade date basis, which are recorded at amortized cost. For held-to-maturity investments, the Company has the intent and ability to hold investments to maturity and it is not more-likely-than-not that the Company will be required to sell the investments before recovery of their amortized cost bases, which may be maturity. On a quarterly basis, the Company reviews its portfolio of investments for impairment. If a decline in fair value is deemed to be other-than-temporary, the security is written down to its fair value through earnings. 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, if one were to occur, in accordance with ASU 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 . In addition, goodwill arising from the ETFS Acquisition (See Note 3) has been allocated to the European Business reporting unit, included within the International Business reportable segment and is assessed annually for impairment on November 30 th . When performing its goodwill impairment test, the Company considers a qualitative assessment, when appropriate, and the income approach, market approach and its market capitalization when determining the fair value of its reporting units. 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 . Leases Effective January 1, 2019, the Company accounts for its lease obligations in accordance with Accounting Standards Codification (“ASC”) Topic 842, Leases (“ASC 842”) ASC 842 also provides a practical expedient which allows for consideration in a contract to be accounted for as a single lease component rather than allocated between lease and non-lease components. The Company has elected to apply this practical expedient to all lease contracts, where applicable. Upon adoption of ASC 842 the Company applied the transitional practical expedients to its outstanding leases and therefore the Company did not reassess (i) whether any expired or existing contracts are or contain leases; (ii) the lease classification for any expired or existing leases and; (iii) initial direct costs for any existing leases. The Company also elected to apply the new lease requirements at the effective date, rather than the beginning of the earliest comparative period presented. Deferred Consideration – Gold Payments 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 11). Changes in the fair value of this obligation are reported as gain/(loss) on revaluation of deferred consideration – gold payments 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 rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities and are included in the computation of EPS pursuant to the two-class method. Share-based payment awards that do not contain such rights are not deemed participating securities and are included in diluted shares outstanding (if dilutive) under the treasury stock method. Diluted EPS reflects the reduction in earnings per share assuming dilutive options or other dilutive contracts to issue common stock were exercised or converted into common stock. Diluted EPS is calculated under the treasury stock and if-converted method and the two-class method. The calculation that results in the most dilutive EPS amount for the common stock is reported in the Company’s consolidated financial statements. 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 bases 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 reduced by a valuation allowance if, based on the weight of available evidence, it is more-likely-than-not that some portion or all the deferred tax assets will not be realized. Tax positions are evaluated utilizing a two-step process. The Company first determines whether any of its tax positions are more-likely-than-not to be sustained upon examination, based solely on the technical merits of the position. Once it is determined that a position meets this recognition threshold, the position is measured as the largest amount of benefit that is greater than 50% likely of being realized upon ultimate settlement. The Company records interest expense and penalties related to tax expenses as income tax expense. Non-income based taxes are recorded as part of other liabilities and other expenses. Recently Issued Accounting Pronouncements In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326) – Measurement of Credit Losses on Financial Instruments In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820) – Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement

Business Combination

Business Combination	3 Months Ended
Business Combination	Mar. 31, 2019
Business Combinations [Abstract]
Business Combination	3. Business Combination Summary On April 11, 2018, the Company acquired for a purchase price consisting of $253,000 in cash, and 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 Convertible Preferred Stock (the “Preferred Shares”), which are convertible into an aggregate of 14,750,000 shares of common stock. Also on April 11, 2018 and in connection with the acquisition, the Company entered into a credit agreement, pursuant to which the lenders extended a $200,000 term loan (the “Term Loan”) and made available a $50,000 revolving credit facility (the “Revolver” and, together with the Term Loan, the “Credit Facility”) (See Note 12). 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 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 Allocation of consideration Cash and cash equivalents 13,687 Receivables and other current assets 14,069 Intangible assets (2) 601,247 Other current liabilities (17,314 ) Fair value of net assets acquired 611,689 Goodwill resulting from the ETFS Acquisition (3) $ 84,057 (1) The closing price of the Company’s common stock on April 10, 2018, the 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 4 11.6 (3) Goodwill arising from the ETFS Acquisition represents the value of 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. Acquisition-Related Costs During the three months ended March 31, 2019 and 2018, the Company incurred acquisition-related costs of $313 and $2,062, respectively. 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 March 31, 2018 Revenues $ 79,771 Net income $ 11,243 (including a loss on revaluation of deferred consideration of $ 2,555 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	3 Months Ended
Cash and Cash Equivalents	Mar. 31, 2019
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	4. Cash and Cash Equivalents Cash and cash equivalents of approximately $34,029 and $34,398 at March 31, 2019 and December 31, 2018, respectively, were held at one financial institution. At March 31, 2019 and December 31, 2018, cash equivalents were approximately $566 and $24, respectively. In addition, certain of our subsidiaries of our International Business segment are required to maintain a minimum level of net liquid assets, which was $12,164 and $11,005 at March 31, 2019 and December 31, 2018, respectively. These requirements are generally satisfied by cash on hand.

Fair Value Measurements

Fair Value Measurements	3 Months Ended
Fair Value Measurements	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	5. Fair Value Measurements The fair value of 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. 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 months ended March 31, 2019 and 2018, there were no transfers between Levels 1, 2 and 3. March 31, 2019 Total Level 1 Level 2 Level 3 Assets: Recurring fair value measurements: Cash equivalents $ 566 $ 566 $ — $ — Securities owned, at fair value 6,419 6,419 — — Total $ 6,985 $ 6,985 $ — $ — Liabilities: Recurring fair value measurements: Deferred consideration (Note 11) $ 157,147 $ — $ — $ 157,147 Securities sold, but not yet purchased 1,338 1,338 — — Total $ 158,485 $ 1,338 $ — $ 157,147 December 31, 2018 Total Level 1 Level 2 Level 3 Assets: Recurring fair value measurements: Cash equivalents $ 24 $ 24 $ — $ — Securities owned, at fair value 8,873 8,873 — — Total $ 8,897 $ 8,897 $ — $ — Non-recurring fair value measurements: Thesys – Series Y preferred stock (1) $ 3,080 $ — $ — $ 3,080 Total $ 3,080 $ — $ — $ 3,080 Liabilities: Recurring fair value measurements: Deferred consideration (Note 11) $ 161,540 $ — $ — $ 161,540 Securities sold, but not yet purchased 1,698 1,698 — — Total $ 163,238 $ 1,698 $ — $ 161,540 (1) Fair value determined on December 31, 2018 (See Note 9). Recurring Fair Value Measurements—Methodology Cash Equivalents (Note 4) – These financial assets represent cash invested in highly liquid investments with original maturities of less than 90 days. These investments are valued at par, which approximates fair value, and are considered Level 1. Securities Owned/Sold but Not Yet Purchased (Note 6) – Securities owned and sold, but not yet purchased are investments in ETFs. ETFs are generally traded in active, quoted and highly liquid markets and are therefore classified as Level 1 in the fair value hierarchy. Deferred Consideration – Deferred consideration represents the present value of an obligation to pay gold into perpetuity and was measured at March 31, 2019 using forward-looking gold prices ranging from $1,303 per ounce to $2,394 per ounce ($1,294 per ounce to $2,621 per ounce at December 31, 2018) which are extrapolated from the last observable price (beyond 2024), discounted at a rate of 10% and includes a perpetual growth rate of 1.5%. This obligation is classified as Level 3 as the discount rate, perpetual growth rate and extrapolated forward-looking gold prices are significant unobservable inputs. An increase in forward-looking gold prices would result in an increase in deferred consideration, whereas an increase in the discount rate would reduce the fair value. See Note 11 for additional information. The following table presents a reconciliation of beginning and ending balances of recurring fair value measurements classified as Level 3: Three Months Ended 2019 2018 Deferred consideration (See Note 11) Beginning balance $ 161,540 $ — Net realized losses/(gains) (1) 3,098 — Net unrealized losses/(gains) (2) (4,404 ) — Settlements (3,087 ) — Ending balance $ 157,147 $ — (1) Recorded as contractual gold payments expense on the Company’s Consolidated Statements of Operations. (2) Recorded as gain on revaluation of deferred consideration – gold payments on the Company’s Consolidated Statements of Operations.

Securities Owned_Sold but Not Y

Securities Owned/Sold but Not Yet Purchased	3 Months Ended
Securities Owned/Sold but Not Yet Purchased	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Securities Owned/Sold but Not Yet Purchased	6. Securities Owned/Sold but Not Yet Purchased The following table is a summary of the Company’s securities owned and securities sold but not yet purchased: March 31, 2019 December 31, Securities Owned Trading securities $ 6,419 $ 8,873 Securities Sold, but not yet Purchased Trading securities $ 1,338 $ 1,698 The Company had no available-for-sale debt securities at March 31, 2019 and December 31, 2018. During the three months ended March 31, 2018, the Company received $60,498 of proceeds from the sale and maturity of available-for-sale debt securities and recognized gross realized losses of $716. Those losses were reclassified out of accumulated other comprehensive income and into the Consolidated Statements of Operations.

Securities Held-to-Maturity

Securities Held-to-Maturity	3 Months Ended
Securities Held-to-Maturity	Mar. 31, 2019
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: March 31, December 31, Federal agency debt instruments (amortized cost) $ 20,159 $ 20,180 The following table summarizes unrealized gains, losses, and fair value (classified as Level 2 within the fair value hierarchy) of securities held-to-maturity: March 31, December 31, Cost/amortized cost $ 20,159 $ 20,180 Gross unrealized gains 6 5 Gross unrealized losses (1,083 ) (1,679 ) Fair value $ 19,082 $ 18,506 The Company assesses these securities for other-than-temporary impairment on a quarterly basis. No securities were determined to be other-than-temporarily impaired at March 31, 2019 or December 31, 2018. 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; however, these securities may be called prior to maturity date: March 31, December 31, Due within one year $ — $ — Due one year through five years — — Due five years through ten years 7,519 7,521 Due over ten years 12,640 12,659 Total $ 20,159 $ 20,180

Note Receivable

Note Receivable	3 Months Ended
Note Receivable	Mar. 31, 2019
Receivables [Abstract]
Note Receivable	8. Note Receivable The Company has an outstanding unsecured promissory note from AdvisorEngine Inc. (“AdvisorEngine”). 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 (“PIK”) by capitalizing such amount and adding it to the principal amount of the original note. AdvisorEngine has the option to prepay the note, in whole or in part, at any time without premium or penalty. All borrowings under the promissory note mature on December 29, 2021 The following is a summary of the outstanding note receivable balance: March 31, December 31, Note receivable (face value) $ 30,000 $ 30,000 Less: Original issue discount (“OID”), unamortized (2,378 ) (2,582 ) Plus: PIK interest 1,695 1,304 Total note receivable, net $ 29,317 $ 28,722 During the three months ended March 31, 2019 and March 31, 2018, the Company recognized interest income of $595 and $416, respectively, which included OID amortization and accrued PIK interest. The Company determined that an allowance for credit loss was not necessary at March 31, 2019 and December 31, 2018 as there have been no adverse events or circumstances since the note was issued which may indicate that its carrying amount may not be recoverable. The fair value of the note receivable (classified as Level 2 within the fair value hierarchy and determined using high yield credit spreads) was $28,802 and $27,618 at March 31, 2019 and December 31, 2018, respectively.

Investments, Carried at Cost

Investments, Carried at Cost	3 Months Ended
Investments, Carried at Cost	Mar. 31, 2019
Investments Schedule [Abstract]
Investments, Carried at Cost	9. Investments, Carried at Cost The following table sets forth the Company’s investments, carried at cost: March 31, December 31, AdvisorEngine – Preferred stock $ 25,000 $ 25,000 Thesys Group, Inc. (“Thesys”) 3,080 3,080 Total $ 28,080 $ 28,080 AdvisorEngine Preferred Stock The Company owns approximately 46% (or 41% on a fully-diluted basis) of AdvisorEngine, a digital wealth management platform, through strategic investments totaling $25,000. In consideration of its investment, the Company received 11,811,856 shares and 2,646,062 shares of Series A and Series A-1 convertible preferred stock, respectively. The Series A and Series A-1 preferred shares have substantially the same terms, are convertible into common stock at the option of the Company and contain various rights and protections including a non-cumulative 6.0% dividend, payable if and when declared by the board of directors, and a liquidation preference that is senior to all other holders of capital stock of AdvisorEngine. The Company and AdvisorEngine also entered into an agreement whereby the Company’s asset allocation models are made available through AdvisorEngine’s open architecture platform and the Company actively introduces the platform to its distribution network. The investment is accounted for under the cost method of accounting as it is not considered to be in-substance common stock. The Company quantitatively assessed its investment for impairment at December 31, 2018 . Range (Weighted Average) Market Approach Revenue multiple 4.7 5.4 5.0 Income Approach Weighted average cost of capital (“WACC”) 26.0 An increase in the revenue multiple would result in a higher enterprise value, whereas an increase in the WACC would reduce fair value. The results of the quantitative assessment noted no impairment at December 31, 2018. In addition, no impairment existed at March 31, 2019 based upon a qualitative assessment. There were also no observable price changes during the applicable reporting periods. 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 of Thesys on a fully diluted basis (excluding certain reserved shares). In addition, the Company was issued a warrant to purchase 3,898,766 shares of Series Y Preferred. The Series Y Preferred ranks pari passu The Series Y Preferred is accounted for under the cost method of accounting as it is not considered to be in-substance common stock. The Company quantitatively assessed its investment for impairment at December 31, 2018. The table below presents the ranges and weighted averages of significant unobservable inputs used in this assessment: Range (Weighted Average) Income Approach (1) Weighted average cost of capital (“WACC”) 3.8 % - 15.5 14.1 % (1) The inputs selected varied, based upon the Thesys business line being valued. An increase in the WACC would result in a lower enterprise value. The quantitative assessment performed resulted in the recognition of an impairment in the fourth quarter of 2018. No additional impairment was recognized at March 31, 2019 based upon a qualitative assessment. There were also no observable price changes during the applicable reporting periods. The carrying value of the Series Y Preferred was $3,080 at March 31, 2019 and December 31, 2018. The fair value of the warrant was determined to be insignificant. The warrant is not accounted for as a derivative as it cannot be net settled and is not readily convertible to cash.

Fixed Assets, net

Fixed Assets, net	3 Months Ended
Fixed Assets, net	Mar. 31, 2019
Property, Plant and Equipment [Abstract]
Fixed Assets, net	10. Fixed Assets, net The following table summarizes fixed assets: March 31, December 31, Equipment $ 2,284 $ 2,244 Furniture and fixtures 2,218 2,218 Leasehold improvements 10,982 10,964 Less: accumulated depreciation and amortization (6,621 ) (6,304 ) Total $ 8,863 $ 9,122

Deferred Consideration

Deferred Consideration	3 Months Ended
Deferred Consideration	Mar. 31, 2019
Text Block [Abstract]
Deferred Consideration	11. Deferred Consideration Deferred consideration represents an obligation the Company assumed in connection with the ETFS Acquisition. The obligation is for fixed payments to ETFS Capital 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 (“Contractual Gold Payments”). The Contractual Gold Payments are paid from advisory fee income generated by any Company-sponsored financial product backed by physical gold and are subject to adjustment and reduction for declines in advisory fee income generated by such products, 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 Gold Bullion Securities Ltd. (a physically backed gold ETP issuer) if the Company fails to remit any amounts due. The Company determined the present value of the deferred consideration of $157,147 and $161,540 at March 31, 2019 and December 31, 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 March 31, 2019 were $11,857 and $145,290, respectively. During the three months ended March 31, 2019, the Company recognized Contractual Gold Payments expense of $3,098, arising from the fixed payments of physical gold bullion of 2,375 ounces and the unwinding of the discount (representing the increase in the carrying amount of the deferred consideration for the passage of time). A gain on the revaluation of deferred consideration of $4,404 was recognized during the three months ended March 31, 2019 due to flattening of the forward-looking gold curve as compared to the forward-looking gold curve on December 31, 2018, the date on which the deferred consideration was last measured. See Note 5 for a reconciliation of changes in the deferred consideration balances.

Long-Term Debt

Long-Term Debt	3 Months Ended
Long-Term Debt	Mar. 31, 2019
Debt Disclosure [Abstract]
Long-Term Debt	12. Long-Term Debt On April 11, 2018 and in connection with the ETFS Acquisition, the Company entered into the Credit Facility pursuant to which the lenders extended a $200,000 $50,000 Revolver. Interest on the Term Loan accrues LIBOR, plus up to 2.00% (commencing at LIBOR, plus 1.75%), 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 an annual rate 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 following table provides a summary of the Company’s outstanding borrowings under the Credit Facility: March 31, 2019 December 31, 2018 Term Loan Revolver Term Loan Revolver Amount borrowed $ 200,000 $ — $ 200,000 $ — Unamortized issuance costs (4,826 ) 1,066 (5,408 ) 1,195 Carrying amount $ 195,174 $ 1,066 $ 194,592 $ 1,195 Effective interest rate (1) 5.47 % n/a 5.09 % n/a (1) Includes amortization of issuance costs. During the three months ended March 31, 2019, the Company recognized $2,892 of interest expense on the Credit Facility. Unamortized issuance costs related to the Revolver of $1,066 and $1,195 at March 31, 2019 and December 31, 2018, respectively, 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 (as defined below), calculated as of the last day of each fiscal quarter, equal to or less than the ratio set forth opposite such fiscal quarter: Fiscal Quarter Ending Total Leverage Ratio 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. The Company’s obligations under the Term Loan and Revolver are unconditionally guaranteed by the Company and certain of its 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. The Company is in compliance with its covenants under the credit agreement.

Preferred Shares

Preferred Shares	3 Months Ended
Preferred Shares	Mar. 31, 2019
Equity [Abstract]
Preferred Shares	13. Preferred Shares On April 10, 2018, the Company filed a Certificate of Designations of Series A Non-Voting Convertible Preferred Stock with the Secretary of State of the State of Delaware establishing the rights, preferences, privileges, qualifications, restrictions, and limitations relating to the Preferred Shares. The Preferred Shares are intended to provide ETFS Capital with economic rights equivalent to the Company’s common stock on an as-converted basis. The Preferred Shares have no voting rights, are not transferable and have the same priority with regard to dividends, distributions and payments as the common stock. 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 trading day prior to the closing of the acquisition. The following is a summary of the Preferred Share balance: March 31, 2019 December 31, Issuance of Preferred Shares $ 132,750 $ 132,750 Less: Issuance costs (181 ) (181 ) Preferred Shares – carrying value $ 132,569 $ 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 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. The carrying amount of the Preferred Shares was not adjusted as it was not probable that the Preferred Shares would become redeemable.

Leases

Leases	3 Months Ended
Leases	Mar. 31, 2019
Lessee Disclosure [Abstract]
Leases	14. Leases The Company has entered into operating leases for its corporate headquarters and other office facilities, financial data terminals and equipment. The Company has no finance leases. Upon the adoption of ASC 842 on January 1, 2019, the Company recognized a right-of-use asset and lease liability of $ 19,827 24,817 The following table provides additional information regarding the Company’s leases: Three Months Ended March 31, 2019 2018 Lease cost: Operating lease cost $ 798 $ 743 Short-term lease cost 389 284 Total lease cost $ 1,187 $ 1,027 Other information: Cash paid for amounts included in the measurement of operating liabilities (operating leases) $ 881 n/a Right-of-use assets obtained in exchange for new operating lease liabilities n/a n/a Weighted-average remaining lease term (in years) – operating leases 10.0 n/a Weighted-average discount rate – operating leases 6.3 % n/a None of the Company’s leases include variable payments, residual value guarantees or any restrictions or covenants relating to the Company’s ability to pay dividends or incur additional financing obligations. The Company’s lease of its headquarters, which expires on August 20, 2029, includes an option to extend for an additional five years. Rent payable under the option is equal to the fair market rent of the premise as determined by the landlord approximately six months prior to the commencement of the extension term. The lease also includes a cancellation option which is effective on August 21, 2024 and requires notice to be provided to the landlord at least 12 months prior. Triggering this option requires a cancellation payment of $4,236. The cancellation and extension options were not reasonably certain of being exercised and were therefore not recognized as part of the right-of-use asset and lease liability. Other leases also include extension, automatic renewal and termination provisions. These provisions were also not reasonably certain of being exercised and were therefore not recognized as part of the right-of-use asset and lease liability. The following table discloses future minimum lease payments at March 31, 2019 with respect to the Company’s operating lease liabilities: Remainder of 2019 $ 2,723 2020 3,695 2021 2,958 2022 2,958 2023 2,958 2024 and thereafter 17,641 Total future minimum lease payments (undiscounted) $ 32,933 The following table reconciles the future minimum lease payments (disclosed above) at March 31, 2019 to the operating lease liabilities recognized in the Company’s Consolidated Balance Sheet: Amounts recognized in the Company’s Consolidated Balance Sheet Lease liability – short term $ 3,651 Lease liability – long term 20,704 Subtotal 24,355 Difference between undiscounted and discounted cash flows 8,578 Total future minimum lease payments (undiscounted) $ 32,933 The following table discloses the future minimum lease payments at March 31, 2018 (prior period), which is required as the Company elected to apply the new lease requirements at the effective date, rather than the beginning of the earliest comparative period presented: Remainder of 2018 $ 3,072 2019 3,764 2020 3,516 2021 3,146 2022 2,958 2023 and thereafter 20,599 Total future minimum lease payments (undiscounted) $ 37,055 Lease Termination – Japan Office The Company recognized an impairment expense of $572 in connection with the termination of its Japan office lease. 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

Contingencies	3 Months Ended
Contingencies	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Contingencies	15. Contingencies The Company may be subject to reviews, inspections and investigations by regulatory authorities as well as legal proceedings arising in the ordinary course of business. The Company is not currently party to any litigation that is expected to have a material adverse impact on its business, financial position, results of operations or cash flows.

Variable Interest Entity

Variable Interest Entity	3 Months Ended
Variable Interest Entity	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable Interest Entity	16. 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 voting rights. The Company determined that AdvisorEngine has the characteristics of a VIE. 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 VIE): March 31, 2019 December 31, Carrying Amount - Assets Preferred stock $ 25,000 $ 25,000 Note receivable - unsecured 29,317 28,722 Total carrying amount - Assets $ 54,317 $ 53,722 Maximum exposure to loss $ 54,317 $ 53,722

Revenues from Contracts with Cu

Revenues from Contracts with Customers	3 Months Ended
Revenues from Contracts with Customers	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer	17. Revenues from Contracts with Customers The following table presents the Company’s total revenues categorized as revenues from contracts with customers and other sources of revenues: Three Months Ended March 31, 2019 March 31, 2018 Revenues from contracts with customers: Advisory fees $ 64,840 $ 58,456 Other 645 448 Total operating revenues $ 65,485 $ 58,904 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 18). 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 18 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 24.

Related Party Transactions

Related Party Transactions	3 Months Ended
Related Party Transactions	Mar. 31, 2019
Related Party Transactions [Abstract]
Related Party Transactions	18. 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 services, excluding extraordinary expenses, taxes and certain other expenses, which is included in fund management and administration on the Company’s Consolidated Statements of Operations. In exchange, the Company receives fees based on a percentage of the ETFs’ average daily net assets. The advisory agreements may be terminated by the related parties upon notice. The following table summarizes accounts receivable from related parties which are included as a component of accounts receivable on the Company’s Consolidated Balance Sheets: March 31, December 31, Receivable from WTT $ 15,036 $ 14,678 Receivable from ETFS Issuers 8,786 8,779 Receivable from BI and WTI 1,004 951 Receivable from WTAMC 189 167 Receivable from WTCS 97 95 Total $ 25,112 $ 24,670 The following table summarizes revenues from advisory services provided to related parties: Three Months Ended March 31, March 31, Advisory services provided to WTT $ 42,223 $ 55,202 Advisory services provided to ETFS Issuers 19,273 — Advisory services provided to BI and WTI 2,504 2,626 Advisory services provided to WTAMC 546 311 Advisory services provided to WTCS 294 317 Total $ 64,840 $ 58,456 The Company also has investments in certain WisdomTree ETFs of approximately $4,940 and $7,117 at March 31, 2019 and December 31, 2018, respectively. Gains related to these ETFs for the three months ended March 31, 2019 and 2018 were $353 and $9, respectively.

Stock-Based Awards

Stock-Based Awards	3 Months Ended
Stock-Based Awards	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Awards	19. Stock-Based Awards 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. The Company grants equity awards to employees and directors which include restricted stock awards (“RSAs”), restricted stock units (“RSUs”), performance-based restricted stock units (“PRSUs”) and stock options. Certain awards described below are subject to acceleration under certain conditions. Stock options: Generally issued for terms of ten years and may vest after at least one year of service and have an exercise price equal to the Company’s stock price on the grant date. The Company estimates the fair value of stock options (when granted) using the Black-Scholes option pricing model. RSAs/RSUs: Awards are valued based on the Company’s stock price on grant date and generally vest ratably over three years. PRSUs: These awards cliff vest three years from grant date and contain a market condition whereby the number of PRSUs ultimately vesting is tied to how the Company’s total shareholder return (“TSR”) compares to a peer group of other publicly traded asset managers over the three-year period. A Monte Carlo simulation is used to value these awards. The number of vesting ranges from 0% to 200% of the target number of granted, as follows: • If the relative TSR is below the 25 th • If the relative TSR is at the 25 th • If the relative TSR is above the 25 th 50 th 100 th For the three months ended March 31, 2019 and 2018, total stock-based compensation expense was $3,072 and $3,309, respectively. A summary of unrecognized stock-based compensation expense and average remaining vesting period is as follows: March 31, 2019 Unrecognized Stock- Average Employees and directors restricted stock awards $ 24,012 2.48 A summary of stock options, restricted stock and restricted stock unit activity for the three months ended March 31, 2019 is as follows: Stock RSAs RSUs PRSUs Balance at January 1, 2019 570,537 1,957,102 9,494 — Granted — 2,233,878 35,283 270,872 (1) Exercised/vested (20,000 ) (827,721 ) (4,341 ) — Forfeitures — (93,194 ) — — Balance at March 31, 2019 550,537 3,270,065 40,436 270,872 (1) (1) Represents the target number of granted and outstanding. The number of that ultimately vest ranges from 0% to 200% of this amount. A Monte Carlo simulation was used to value these awards using the following assumptions for the Company and the peer group: (i) beginning 90-day average stock prices; (ii) valuation date stock prices; (iii) historical stock price volatilities ranging from 22% to 42% (average 28%); (iv) correlation coefficients based upon the price data used to calculate the historical volatilities; (v) a risk free interest rate of 2.56%; and (vi) an expected dividend yield of 0%.

Earnings Per Share

Earnings Per Share	3 Months Ended
Earnings Per Share	Mar. 31, 2019
Earnings Per Share [Abstract]
Earnings Per Share	20. 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 March 31, Basic Earnings per Share 2019 2018 Net income $ 8,824 $ 9,424 Less: Income distributed to participating securities (544 ) (71 ) Less: Undistributed income allocable to participating securities (391 ) (85 ) Net income available to common stockholders $ 7,889 $ 9,268 Weighted average common shares (in thousands) 151,625 135,329 Basic earnings per share $ 0.05 $ 0.07 Three Months Ended March 31, Diluted Earnings per Share 2019 2018 Net income $ 8,824 $ 9,424 Weighted Average Diluted Shares (in thousands): Weighted average common shares 151,625 135,329 Dilutive effect of common stock equivalents 15,186 1,139 Weighted average diluted shares 166,811 136,468 Diluted earnings per share $ 0.05 $ 0.07 Diluted earnings per share is calculated under both the treasury stock and if-converted method and the two-class method and reflects the reduction in earnings per share assuming options or other contracts to issue common stock were exercised or converted into common stock (if dilutive). The calculation that results in the most dilutive earnings per share amount for common stock is reported in the Company’s consolidated financial statements. The Company excluded 3,495,080 and 1,101,513 common stock equivalents from its computation of diluted earnings per share for the three months ended March 31, 2019 and 2018, respectively, as they were determined to be anti-dilutive.

Income Taxes

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	21. Income Taxes Effective Income Tax Rate – Three Months Ended March 31, 2019 and March 31, 2018 The Company’s effective income tax rate for the three months ended March 31, 2019 of negative 13.5% resulted in an income tax benefit of $ 1,049 tax rate differs from the federal statutory tax rate of 21% primarily due to a $4,309 reduction in unrecognized tax benefits, a non-taxable gain on revaluation of deferred consideration and a lower tax rate on foreign earnings, partly offset by a valuation allowance on foreign net operating losses, tax shortfalls associated with the vesting and exercise of stock-based compensation awards and state and local income taxes. The Company’s effective income tax rate for the three months ended March 31, 2018 of 32.3% resulted in income tax expense of $4,498. The Company’s tax rate differs from the federal statutory tax rate of 21% primarily due to a valuation allowance on foreign net operating losses and state and local income taxes, partly offset by tax windfalls associated with the vesting and exercise of stock-based compensation awards. Deferred Tax Assets A summary of the components of the Company’s deferred tax assets at March 31, 2019 and December 31, 2018 are as follows: March 31, 2019 December 31, 2018 Deferred tax assets: NOLs Foreign $ 8,222 $ 6,605 Goodwill and intangible assets 1,794 1,841 Accrued expenses 1,358 2,699 Stock-based compensation 1,189 2,673 Net lease liability 1,172 1,184 Capital losses 794 794 NOLs – U.S. 635 762 Other 37 40 Deferred tax assets 15,201 16,598 Deferred tax liabilities: Fixed assets and prepaid assets 1,439 1,433 Unrealized gains 748 724 Deferred tax liabilities 2,187 2,157 Total deferred tax assets less deferred tax liabilities 13,014 14,441 Less: valuation allowance (9,016 ) (7,399 ) Deferred tax assets, net $ 3,998 $ 7,042 Net Operating Losses – U.S . The Company’s pre-tax federal net operating losses for tax purposes (“NOLs”) at March 31, 2019 were $2,622 which expire in 2024. The net operating loss carryforwards have been reduced by the impact of annual limitations described in Internal Revenue Code Section 382 that arose as a result of an ownership change. The Company’s pre-tax capital loss at March 31, 2019 was $3,278. A full valuation allowance was established as it is more-likely-than-not that some portion, or all, of the deferred tax assets will not be realized. Net Operating Losses – Foreign Certain of the Company’s European subsidiaries and its Canadian subsidiary generated NOLs outside the U.S. These tax effected NOLs were $8,222 and $6,605 at March 31, 2019 and December 31, 2018, respectively. The Company established a full valuation allowance related to these NOLs as it is more-likely-than-not that some portion, or all, of the deferred tax assets will not be realized. Approximately $4,050 of these NOLs at March 31, 2019 expire between the years 2036 and 2039 Uncertain Tax Positions Tax positions are evaluated utilizing a two-step process. The Company first determines whether any of its tax positions are more-likely-than-not to be sustained upon examination, based solely on the technical merits of the position. Once it is determined that a position meets this recognition threshold, the position is measured as the largest amount of benefit that is greater than 50% likely of being realized upon ultimate settlement. In connection with the ETFS Acquisition, the Company accrued a liability for uncertain tax positions and interest and penalties at the acquisition date. The table below sets forth the aggregate changes in the balance of these gross unrecognized tax benefits for the three months ended March 31, 2019: Total Unrecognized Interest and Balance on January 1, 2019 $ 34,876 $ 28,101 $ 6,775 Decrease—Lapse of statute of limitations (4,309 ) (2,999 ) (1,310 ) Increases 101 — 101 Foreign currency translation (1) 925 745 180 Balance at March 31, 2019 $ 31,593 $ 25,847 $ 5,746 (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 decrease resulting from the lapsing of the statute of limitations of $4,309 was recorded as an income tax benefit and an equal and offsetting amount to reduce the indemnification asset was recorded in other losses, net. The gross unrecognized tax benefits and interest and penalties totaling $31,593 at March 31, 2019 are included in other non-current liabilities on the Consolidated Balance Sheet. It is expected that the amount of unrecognized tax benefits will change in the next 12 months; however, the Company does not expect the change to have a material impact on its consolidated financial statements. At March 31, 2019, there were $25,847 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 due to the indemnity for any potential claims. 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 Company’s federal tax return and ManJer’s tax return (a Jersey-based subsidiary) for the year ended December 31, 2016 are currently under review by the relevant tax authorities. The Company is indemnified by ETFS Capital for any potential exposure associated with ManJer’s tax return under audit. The Company is not currently under audit in any other income tax jurisdictions. As of March 31, 2019, with few exceptions, the Company was no longer subject to income tax examinations by any taxing authority for years before 2015. Undistributed Earnings of Foreign Subsidiaries The Company recognizes deferred tax liabilities for withholding taxes that may become payable, where applicable, upon the distribution of earnings and profits from foreign subsidiaries unless considered permanent in duration. As of March 31, 2019, the Company considers all undistributed foreign earnings and profits to be permanent in duration.

Shares Repurchased

Shares Repurchased	3 Months Ended
Shares Repurchased	Mar. 31, 2019
Equity [Abstract]
Shares Repurchased	22. Shares Repurchased On April 24, 2019, the Company’s Board of Directors extended the term of the Company’s share repurchase program for three years through April 27, 2022 As more fully disclosed in Note 3, the Company completed the ETFS Acquisition on April 11, 2018. To partially finance the acquisition, the Company 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 During the three months ended March 31, 2019 and March 31, 2018, the Company repurchased 311,213 shares and 60,508 shares of its common stock, respectively, under this program for an aggregate cost of $2,005 and $734, respectively. As of March 31, 2019, $83,724 remains under this program for future purchases.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	3 Months Ended
Goodwill and Intangible Assets	Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	23. 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 . Goodwill allocated to the European Business reporting unit is tested annually for impairment on November 30 th : Reporting Unit European Business (1) U.S. Business Total Balance at January 1, 2019 $ 84,057 $ 1,799 $ 85,856 Changes — — — Balance at March 31, 2019 $ 84,057 $ 1,799 $ 85,856 (1) The European Business is included in the Company’s International Business reportable segment. The goodwill allocated to the European Business reporting unit is not deductible for tax purposes as the transaction was structured as a stock acquisition occurring in the United Kingdom. The goodwill allocated to the U.S. Business reporting unit is deductible for tax purposes. Intangible Assets (Indefinite-Lived) Advisory (ETFS) Advisory Total Balance at January 1, 2019 $ 601,247 $ 1,962 $ 603,209 Foreign currency translation — 42 42 Balance at March 31, 2019 $ 601,247 $ 2,004 $ 603,251 ETFS In connection with the ETFS Acquisition which was completed on April 11, 2018 th as its annual impairment testing date for these intangible assets. Questrade ETFs During the fourth quarter of 2017, the Company acquired eight 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 as its annual impairment testing date for these intangible assets.

Segment Reporting

Segment Reporting	3 Months Ended
Segment Reporting	Mar. 31, 2019
Segment Reporting [Abstract]
Segment Reporting	24. 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 U.S. Business segment includes the results of the Company’s U.S. operations and wind down costs associated with the Japan sales office. The results of the Company’s European and Canadian operations are reported as the International Business segment. Information concerning these reportable segments are as follows: Three Months Ended March 31, 2019 2018 U.S. Business Segment Operating revenues Advisory fees $ 42,517 $ 55,518 Other income 106 147 Total operating revenues $ 42,623 $ 55,665 Total operating expenses $ (37,176 ) $ (39,030 ) Other income/(expenses) Interest expense $ (192 ) $ — Interest income 779 962 Impairment (572 ) — Other gains/(losses), net 145 (226 ) Total other income/(expenses) $ 160 $ 736 Total income before taxes (U.S. Business Segment) $ 5,607 $ 17,371 International Business Segment (1) Operating revenues Advisory fees $ 22,323 $ 2,938 Other income 539 301 Total operating revenues $ 22,862 $ 3,239 Total operating expenses $ (17,626 ) $ (6,653 ) Other income/(expenses) Interest expense $ (2,700 ) $ — Gain on revaluation of deferred consideration 4,404 — Other losses, net (4,772 ) (35 ) Total other income/(expenses) $ (3,068 ) $ (35 ) Total income/(loss) before taxes (International Business Segment) $ 2,168 $ (3,449 ) Income/(loss) before taxes U.S. Business segment $ 5,607 $ 17,371 International Business segment 2,168 (3,449 ) Total income before taxes $ 7,775 $ 13,922 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	3 Months Ended
Subsequent Events	Mar. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	25. Subsequent Events Convertible Note - AdvisorEngine On April 11, 2019, the Company participated in a private convertible note financing round of AdvisorEngine by advancing $1,540 in consideration for a convertible note, which was issued as part of a series of convertible notes pursuant to a Convertible Note Purchase Agreement entered into between AdvisorEngine, the Company and the other purchasers thereto. The convertible note bears interest at a rate of 3% per annum, with all or any unpaid portion being treated as PIK by capitalizing such amount and adding it to the principal amount outstanding, is unsecured, and matures on April 11, 2021. All principal (and, at the option of AdvisorEngine if not paid in cash, accrued interest) under the convertible note will automatically convert into a class or series of preferred stock substantially identical to that issued in a qualified financing (as defined therein), but at a price per share equal to 80% of the price per share sold in such transaction. In the event of a corporate transaction (as defined therein) the convertible note would be repaid in cash from the proceeds of such transaction in the amount of 1.5 times the outstanding principal amount, plus any accrued and unpaid interest. If neither a qualified financing nor a corporate transaction occur prior to the maturity date, the convertible note is repaid at a rate of 1.25 times the outstanding principal amount, plus accrued and unpaid interest. The convertible note may not be prepaid by AdvisorEngine without the prior consent of the requisite holders (which includes the Company).

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	3 Months Ended
Significant Accounting Policies (Policies)	Mar. 31, 2019
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 the Company’s consolidated financial statements since the acquisition date, April 11, 2018 (See Note 3). Certain accounts in the consolidated financial statements for the three months ended March 31, 2018 have been reclassified to conform to the current year’s consolidated financial statement presentation. The following table summarizes these reclassifications which had no effect on previously reported net income. Operating Revenues: Three Months Ended March 31, 2018 Advisory fees (previously reported) $ 58,756 Other ETP fees reclassified to Other income (300 ) Advisory fees (currently reported) $ 58,456 Other income (previously reported) $ 849 Other ETP fees reclassified from Advisory fees 300 Interest income reclassified to Other Income/(Expenses) (962 ) Realized and unrealized losses reclassified to Other losses, net 261 Other income (currently reported) $ 448 Total revenues (currently reported) $ 58,904 Other Income/(Expenses): Interest income reclassified from operating revenues $ 962 Other losses, net (previously reported) $ — Realized and unrealized losses reclassified from operating revenues (261 ) Other losses, net (currently reported) $ (261 )
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 and paid 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.
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. These securities are recorded on their trade date and are measured at fair value. All equity securities are classified by the Company as trading. Debt securities are classified based primarily on the Company’s intent to hold or sell the security. Changes in the fair value of securities classified as trading are reported in other income in the period the change occurs. Unrealized gains and losses of securities classified as available-for-sale are included in other comprehensive income. Once sold, amounts reclassified out of accumulated other comprehensive income and into earnings are determined using the specific identification method. Available-for-sale securities are assessed for impairment on a quarterly basis.
Securities Held-to-Maturity	Securities Held-to-Maturity The Company accounts for certain of its investments as held-to-maturity on a trade date basis, which are recorded at amortized cost. For held-to-maturity investments, the Company has the intent and ability to hold investments to maturity and it is not more-likely-than-not that the Company will be required to sell the investments before recovery of their amortized cost bases, which may be maturity. On a quarterly basis, the Company reviews its portfolio of investments for impairment. If a decline in fair value is deemed to be other-than-temporary, the security is written down to its fair value through earnings.
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, if one were to occur, in accordance with ASU 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 . In addition, goodwill arising from the ETFS Acquisition (See Note 3) has been allocated to the European Business reporting unit, included within the International Business reportable segment and is assessed annually for impairment on November 30 th . When performing its goodwill impairment test, the Company considers a qualitative assessment, when appropriate, and the income approach, market approach and its market capitalization when determining the fair value of its reporting units.
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 .
Leases	Leases Effective January 1, 2019, the Company accounts for its lease obligations in accordance with Accounting Standards Codification (“ASC”) Topic 842, Leases (“ASC 842”) ASC 842 also provides a practical expedient which allows for consideration in a contract to be accounted for as a single lease component rather than allocated between lease and non-lease components. The Company has elected to apply this practical expedient to all lease contracts, where applicable. Upon adoption of ASC 842 the Company applied the transitional practical expedients to its outstanding leases and therefore the Company did not reassess (i) whether any expired or existing contracts are or contain leases; (ii) the lease classification for any expired or existing leases and; (iii) initial direct costs for any existing leases. The Company also elected to apply the new lease requirements at the effective date, rather than the beginning of the earliest comparative period presented.
Deferred Consideration - Gold Payments	Deferred Consideration – Gold Payments 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 11). Changes in the fair value of this obligation are reported as gain/(loss) on revaluation of deferred consideration – gold payments 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 rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities and are included in the computation of EPS pursuant to the two-class method. Share-based payment awards that do not contain such rights are not deemed participating securities and are included in diluted shares outstanding (if dilutive) under the treasury stock method. Diluted EPS reflects the reduction in earnings per share assuming dilutive options or other dilutive contracts to issue common stock were exercised or converted into common stock. Diluted EPS is calculated under the treasury stock and if-converted method and the two-class method. The calculation that results in the most dilutive EPS amount for the common stock is reported in the Company’s consolidated financial statements.
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 bases 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 reduced by a valuation allowance if, based on the weight of available evidence, it is more-likely-than-not that some portion or all the deferred tax assets will not be realized. Tax positions are evaluated utilizing a two-step process. The Company first determines whether any of its tax positions are more-likely-than-not to be sustained upon examination, based solely on the technical merits of the position. Once it is determined that a position meets this recognition threshold, the position is measured as the largest amount of benefit that is greater than 50% likely of being realized upon ultimate settlement. The Company records interest expense and penalties related to tax expenses as income tax expense. Non-income based taxes are recorded as part of other liabilities and other expenses.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326) – Measurement of Credit Losses on Financial Instruments In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820) – Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement

Significant Accounting Polici_3

Significant Accounting Policies (Tables)	3 Months Ended
Significant Accounting Policies (Tables)	Mar. 31, 2019
Accounting Policies [Abstract]
Summary of Reclassifications to Conform to the Current Year's Consolidated Financial Statement Presentation	The following table summarizes these reclassifications which had no effect on previously reported net income. Operating Revenues: Three Months Ended March 31, 2018 Advisory fees (previously reported) $ 58,756 Other ETP fees reclassified to Other income (300 ) Advisory fees (currently reported) $ 58,456 Other income (previously reported) $ 849 Other ETP fees reclassified from Advisory fees 300 Interest income reclassified to Other Income/(Expenses) (962 ) Realized and unrealized losses reclassified to Other losses, net 261 Other income (currently reported) $ 448 Total revenues (currently reported) $ 58,904 Other Income/(Expenses): Interest income reclassified from operating revenues $ 962 Other losses, net (previously reported) $ — Realized and unrealized losses reclassified from operating revenues (261 ) Other losses, net (currently reported) $ (261 )
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)	3 Months Ended
Business Combination (Tables)	Mar. 31, 2019
Business Combinations [Abstract]
Summary of Allocation Of Purchase Price	The following table summarizes the 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 Allocation of consideration Cash and cash equivalents 13,687 Receivables and other current assets 14,069 Intangible assets (2) 601,247 Other current liabilities (17,314 ) Fair value of net assets acquired 611,689 Goodwill resulting from the ETFS Acquisition (3) $ 84,057 (1) The closing price of the Company’s common stock on April 10, 2018, the 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 4 11.6 (3) Goodwill arising from the ETFS Acquisition represents the value of 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 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 March 31, 2018 Revenues $ 79,771 Net income $ 11,243 (including a loss on revaluation of deferred consideration of $ 2,555

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
Fair Value Measurements (Tables)	Mar. 31, 2019
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 months ended March 31, 2019 and 2018, there were no transfers between Levels 1, 2 and 3. March 31, 2019 Total Level 1 Level 2 Level 3 Assets: Recurring fair value measurements: Cash equivalents $ 566 $ 566 $ — $ — Securities owned, at fair value 6,419 6,419 — — Total $ 6,985 $ 6,985 $ — $ — Liabilities: Recurring fair value measurements: Deferred consideration (Note 11) $ 157,147 $ — $ — $ 157,147 Securities sold, but not yet purchased 1,338 1,338 — — Total $ 158,485 $ 1,338 $ — $ 157,147 December 31, 2018 Total Level 1 Level 2 Level 3 Assets: Recurring fair value measurements: Cash equivalents $ 24 $ 24 $ — $ — Securities owned, at fair value 8,873 8,873 — — Total $ 8,897 $ 8,897 $ — $ — Non-recurring fair value measurements: Thesys – Series Y preferred stock (1) $ 3,080 $ — $ — $ 3,080 Total $ 3,080 $ — $ — $ 3,080 Liabilities: Recurring fair value measurements: Deferred consideration (Note 11) $ 161,540 $ — $ — $ 161,540 Securities sold, but not yet purchased 1,698 1,698 — — Total $ 163,238 $ 1,698 $ — $ 161,540 (1) Fair value determined on December 31, 2018 (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 2019 2018 Deferred consideration (See Note 11) Beginning balance $ 161,540 $ — Net realized losses/(gains) (1) 3,098 — Net unrealized losses/(gains) (2) (4,404 ) — Settlements (3,087 ) — Ending balance $ 157,147 $ — (1) Recorded as contractual gold payments expense on the Company’s Consolidated Statements of Operations. (2) Recorded as gain on revaluation of deferred consideration – gold payments on the Company’s Consolidated Statements of Operations.

Securities Owned_Sold but Not_2

Securities Owned/Sold but Not Yet Purchased (Tables)	3 Months Ended
Securities Owned/Sold but Not Yet Purchased (Tables)	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Schedule of Securities Owned/Sold But Not Yet Purchased	The following table is a summary of the Company’s securities owned and securities sold but not yet purchased: March 31, 2019 December 31, Securities Owned Trading securities $ 6,419 $ 8,873 Securities Sold, but not yet Purchased Trading securities $ 1,338 $ 1,698

Securities Held-to-Maturity (Ta

Securities Held-to-Maturity (Tables)	3 Months Ended
Securities Held-to-Maturity (Tables)	Mar. 31, 2019
Text Block [Abstract]
Schedule of Securities Held-to-Maturity	The following table is a summary of the Company’s securities held-to-maturity: March 31, December 31, Federal agency debt instruments (amortized cost) $ 20,159 $ 20,180
Schedule of Unrealized Gains, Losses and Fair Value of Securities Held-to-Maturity	The following table summarizes unrealized gains, losses, and fair value (classified as Level 2 within the fair value hierarchy) of securities held-to-maturity: March 31, December 31, Cost/amortized cost $ 20,159 $ 20,180 Gross unrealized gains 6 5 Gross unrealized losses (1,083 ) (1,679 ) Fair value $ 19,082 $ 18,506
Schedule of Maturity Profile of Securities Held-to-Maturity	The following table sets forth the maturity profile of the securities held-to-maturity; however, these securities may be called prior to maturity date: March 31, December 31, Due within one year $ — $ — Due one year through five years — — Due five years through ten years 7,519 7,521 Due over ten years 12,640 12,659 Total $ 20,159 $ 20,180

Note Receivable (Tables)

Note Receivable (Tables)	3 Months Ended
Note Receivable (Tables)	Mar. 31, 2019
Receivables [Abstract]
Summary of Outstanding Note Receivable Balance	The following is a summary of the outstanding note receivable balance: March 31, December 31, Note receivable (face value) $ 30,000 $ 30,000 Less: Original issue discount (“OID”), unamortized (2,378 ) (2,582 ) Plus: PIK interest 1,695 1,304 Total note receivable, net $ 29,317 $ 28,722

Investments, Carried at Cost (T

Investments, Carried at Cost (Tables)	3 Months Ended
Investments, Carried at Cost (Tables)	Mar. 31, 2019
Investment [Line Items]
Investments, Carried at Cost	The following table sets forth the Company’s investments, carried at cost: March 31, December 31, AdvisorEngine – Preferred stock $ 25,000 $ 25,000 Thesys Group, Inc. (“Thesys”) 3,080 3,080 Total $ 28,080 $ 28,080
Advisor Engine [Member]
Investment [Line Items]
Summary of Ranges and Weighted Averages of Significant Unobservable Inputs Used to Determine Enterprise Value	Range (Weighted Average) Market Approach Revenue multiple 4.7 5.4 5.0 Income Approach Weighted average cost of capital (“WACC”) 26.0
Thesys Group, Inc [Member]
Investment [Line Items]
Summary of Ranges and Weighted Averages of Significant Unobservable Inputs Used to Determine Enterprise Value	The table below presents the ranges and weighted averages of significant unobservable inputs used in this assessment: Range (Weighted Average) Income Approach (1) Weighted average cost of capital (“WACC”) 3.8 % - 15.5 14.1 % (1) The inputs selected varied, based upon the Thesys business line being valued. An increase in the WACC would result in a lower enterprise value.

Fixed Assets, net (Tables)

Fixed Assets, net (Tables)	3 Months Ended
Fixed Assets, net (Tables)	Mar. 31, 2019
Property, Plant and Equipment [Abstract]
Schedule of Fixed Assets	The following table summarizes fixed assets: March 31, December 31, Equipment $ 2,284 $ 2,244 Furniture and fixtures 2,218 2,218 Leasehold improvements 10,982 10,964 Less: accumulated depreciation and amortization (6,621 ) (6,304 ) Total $ 8,863 $ 9,122

Long-Term Debt (Tables)

Long-Term Debt (Tables)	3 Months Ended
Long-Term Debt (Tables)	Mar. 31, 2019
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: March 31, 2019 December 31, 2018 Term Loan Revolver Term Loan Revolver Amount borrowed $ 200,000 $ — $ 200,000 $ — Unamortized issuance costs (4,826 ) 1,066 (5,408 ) 1,195 Carrying amount $ 195,174 $ 1,066 $ 194,592 $ 1,195 Effective interest rate (1) 5.47 % n/a 5.09 % 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 (as defined below), calculated as of the last day of each fiscal quarter, equal to or less than the ratio set forth opposite such fiscal quarter: Fiscal Quarter Ending Total Leverage Ratio 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)	3 Months Ended
Preferred Shares (Tables)	Mar. 31, 2019
Equity [Abstract]
Summary of Preferred Share Balance	The following is a summary of the Preferred Share balance: March 31, 2019 December 31, Issuance of Preferred Shares $ 132,750 $ 132,750 Less: Issuance costs (181 ) (181 ) Preferred Shares – carrying value $ 132,569 $ 132,569

Leases (Tables)

Leases (Tables)	3 Months Ended
Leases (Tables)	Mar. 31, 2019
Lessee Disclosure [Abstract]
Schedule for Summary of Additional Information Related to Operating Lease	The following table provides additional information regarding the Company’s leases: Three Months Ended March 31, 2019 2018 Lease cost: Operating lease cost $ 798 $ 743 Short-term lease cost 389 284 Total lease cost $ 1,187 $ 1,027 Other information: Cash paid for amounts included in the measurement of operating liabilities (operating leases) $ 881 n/a Right-of-use assets obtained in exchange for new operating lease liabilities n/a n/a Weighted-average remaining lease term (in years) – operating leases 10.0 n/a Weighted-average discount rate – operating leases 6.3 % n/a
Schedule of Future Minimum Lease Payments	The following table discloses future minimum lease payments at March 31, 2019 with respect to the Company’s operating lease liabilities: Remainder of 2019 $ 2,723 2020 3,695 2021 2,958 2022 2,958 2023 2,958 2024 and thereafter 17,641 Total future minimum lease payments (undiscounted) $ 32,933 The following table discloses the future minimum lease payments at March 31, 2018 (prior period), which is required as the Company elected to apply the new lease requirements at the effective date, rather than the beginning of the earliest comparative period presented: Remainder of 2018 $ 3,072 2019 3,764 2020 3,516 2021 3,146 2022 2,958 2023 and thereafter 20,599 Total future minimum lease payments (undiscounted) $ 37,055
Schedule for Supplemental Balance Sheet Information Related to Operating Lease	The following table reconciles the future minimum lease payments (disclosed above) at March 31, 2019 to the operating lease liabilities recognized in the Company’s Consolidated Balance Sheet: Amounts recognized in the Company’s Consolidated Balance Sheet Lease liability – short term $ 3,651 Lease liability – long term 20,704 Subtotal 24,355 Difference between undiscounted and discounted cash flows 8,578 Total future minimum lease payments (undiscounted) $ 32,933

Variable Interest Entity (Table

Variable Interest Entity (Tables)	3 Months Ended
Variable Interest Entity (Tables)	Mar. 31, 2019
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 VIE): March 31, 2019 December 31, Carrying Amount - Assets Preferred stock $ 25,000 $ 25,000 Note receivable - unsecured 29,317 28,722 Total carrying amount - Assets $ 54,317 $ 53,722 Maximum exposure to loss $ 54,317 $ 53,722

Revenues from Contracts with _2

Revenues from Contracts with Customers (Tables)	3 Months Ended
Revenues from Contracts with Customers (Tables)	Mar. 31, 2019
Revenue from Contract with Customer [Abstract]
Summary of Revenues from Contracts with Customers	The following table presents the Company’s total revenues categorized as revenues from contracts with customers and other sources of revenues: Three Months Ended March 31, 2019 March 31, 2018 Revenues from contracts with customers: Advisory fees $ 64,840 $ 58,456 Other 645 448 Total operating revenues $ 65,485 $ 58,904

Related Party Transactions (Tab

Related Party Transactions (Tables)	3 Months Ended
Related Party Transactions (Tables)	Mar. 31, 2019
Related Party Transactions [Abstract]
Summary of Accounts Receivable from Related Parties	The following table summarizes accounts receivable from related parties which are included as a component of accounts receivable on the Company’s Consolidated Balance Sheets: March 31, December 31, Receivable from WTT $ 15,036 $ 14,678 Receivable from ETFS Issuers 8,786 8,779 Receivable from BI and WTI 1,004 951 Receivable from WTAMC 189 167 Receivable from WTCS 97 95 Total $ 25,112 $ 24,670
Summary of Revenues from Advisory Services Provided to Related Parties	The following table summarizes revenues from advisory services provided to related parties: Three Months Ended March 31, March 31, Advisory services provided to WTT $ 42,223 $ 55,202 Advisory services provided to ETFS Issuers 19,273 — Advisory services provided to BI and WTI 2,504 2,626 Advisory services provided to WTAMC 546 311 Advisory services provided to WTCS 294 317 Total $ 64,840 $ 58,456

Stock-Based Awards (Tables)

Stock-Based Awards (Tables)	3 Months Ended
Stock-Based Awards (Tables)	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Unrecognized Stock-Based Compensation Expense and Average Remaining Vesting Period	A summary of unrecognized stock-based compensation expense and average remaining vesting period is as follows: March 31, 2019 Unrecognized Stock- Average Employees and directors restricted stock awards $ 24,012 2.48
Summary of Stock Options, Restricted Stock, Restricted Stock Unit and Performance Stock Unit Activity	A summary of stock options, restricted stock and restricted stock unit activity for the three months ended March 31, 2019 is as follows: Stock RSAs RSUs PRSUs Balance at January 1, 2019 570,537 1,957,102 9,494 — Granted — 2,233,878 35,283 270,872 (1) Exercised/vested (20,000 ) (827,721 ) (4,341 ) — Forfeitures — (93,194 ) — — Balance at March 31, 2019 550,537 3,270,065 40,436 270,872 (1) (1) Represents the target number of granted and outstanding. The number of that ultimately vest ranges from 0% to 200% of this amount. A Monte Carlo simulation was used to value these awards using the following assumptions for the Company and the peer group: (i) beginning 90-day average stock prices; (ii) valuation date stock prices; (iii) historical stock price volatilities ranging from 22% to 42% (average 28%); (iv) correlation coefficients based upon the price data used to calculate the historical volatilities; (v) a risk free interest rate of 2.56%; and (vi) an expected dividend yield of 0%.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	3 Months Ended
Earnings Per Share (Tables)	Mar. 31, 2019
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 March 31, Basic Earnings per Share 2019 2018 Net income $ 8,824 $ 9,424 Less: Income distributed to participating securities (544 ) (71 ) Less: Undistributed income allocable to participating securities (391 ) (85 ) Net income available to common stockholders $ 7,889 $ 9,268 Weighted average common shares (in thousands) 151,625 135,329 Basic earnings per share $ 0.05 $ 0.07 Three Months Ended March 31, Diluted Earnings per Share 2019 2018 Net income $ 8,824 $ 9,424 Weighted Average Diluted Shares (in thousands): Weighted average common shares 151,625 135,329 Dilutive effect of common stock equivalents 15,186 1,139 Weighted average diluted shares 166,811 136,468 Diluted earnings per share $ 0.05 $ 0.07

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
Income Taxes (Tables)	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Summary of Deferred Tax Asset Recorded	A summary of the components of the Company’s deferred tax assets at March 31, 2019 and December 31, 2018 are as follows: March 31, 2019 December 31, 2018 Deferred tax assets: NOLs Foreign $ 8,222 $ 6,605 Goodwill and intangible assets 1,794 1,841 Accrued expenses 1,358 2,699 Stock-based compensation 1,189 2,673 Net lease liability 1,172 1,184 Capital losses 794 794 NOLs – U.S. 635 762 Other 37 40 Deferred tax assets 15,201 16,598 Deferred tax liabilities: Fixed assets and prepaid assets 1,439 1,433 Unrealized gains 748 724 Deferred tax liabilities 2,187 2,157 Total deferred tax assets less deferred tax liabilities 13,014 14,441 Less: valuation allowance (9,016 ) (7,399 ) Deferred tax assets, net $ 3,998 $ 7,042
Schedule of Changes in Balance of Gross Unrecognized Tax Benefits	The table below sets forth the aggregate changes in the balance of these gross unrecognized tax benefits for the three months ended March 31, 2019: Total Unrecognized Interest and Balance on January 1, 2019 $ 34,876 $ 28,101 $ 6,775 Decrease—Lapse of statute of limitations (4,309 ) (2,999 ) (1,310 ) Increases 101 — 101 Foreign currency translation (1) 925 745 180 Balance at March 31, 2019 $ 31,593 $ 25,847 $ 5,746

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	3 Months Ended
Goodwill and Intangible Assets (Tables)	Mar. 31, 2019
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 . Goodwill allocated to the European Business reporting unit is tested annually for impairment on November 30 th : Reporting Unit European Business (1) U.S. Business Total Balance at January 1, 2019 $ 84,057 $ 1,799 $ 85,856 Changes — — — Balance at March 31, 2019 $ 84,057 $ 1,799 $ 85,856 (1) The European Business is included in the Company’s International Business reportable segment.
Summary of Indefinite-lived Intangible Assets	Intangible Assets (Indefinite-Lived) Advisory (ETFS) Advisory Total Balance at January 1, 2019 $ 601,247 $ 1,962 $ 603,209 Foreign currency translation — 42 42 Balance at March 31, 2019 $ 601,247 $ 2,004 $ 603,251

Segment Reporting (Tables)

Segment Reporting (Tables)	3 Months Ended
Segment Reporting (Tables)	Mar. 31, 2019
Segment Reporting [Abstract]
Reportable Segment Information	Information concerning these reportable segments are as follows: Three Months Ended March 31, 2019 2018 U.S. Business Segment Operating revenues Advisory fees $ 42,517 $ 55,518 Other income 106 147 Total operating revenues $ 42,623 $ 55,665 Total operating expenses $ (37,176 ) $ (39,030 ) Other income/(expenses) Interest expense $ (192 ) $ — Interest income 779 962 Impairment (572 ) — Other gains/(losses), net 145 (226 ) Total other income/(expenses) $ 160 $ 736 Total income before taxes (U.S. Business Segment) $ 5,607 $ 17,371 International Business Segment (1) Operating revenues Advisory fees $ 22,323 $ 2,938 Other income 539 301 Total operating revenues $ 22,862 $ 3,239 Total operating expenses $ (17,626 ) $ (6,653 ) Other income/(expenses) Interest expense $ (2,700 ) $ — Gain on revaluation of deferred consideration 4,404 — Other losses, net (4,772 ) (35 ) Total other income/(expenses) $ (3,068 ) $ (35 ) Total income/(loss) before taxes (International Business Segment) $ 2,168 $ (3,449 ) Income/(loss) before taxes U.S. Business segment $ 5,607 $ 17,371 International Business segment 2,168 (3,449 ) Total income before taxes $ 7,775 $ 13,922 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.

Organization and Description _2

Organization and Description of Business - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Operating income	$ 10,683	$ 13,221
WisdomTree Japan [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Operating income	(430)	$ (1,232)
Impairment of Leasehold	$ 572
Acquisition of ETFS Business [Member]
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Business Acquisition, Effective Date of Acquisition	Apr. 11, 2018

Significant Accounting Polici_4

Significant Accounting Policies - Summary of Reclassifications to Conform to the Current Year's Consolidated Financial Statement Presentation (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Revenues:
Advisory fees		$ 58,456
Other income		448
Total revenues (currently reported)	$ 65,485	58,904
Other Income/(Expenses):
Other losses, net	(4,627)	(261)
Interest income	$ 779	962
Previously Reported [Member]
Operating Revenues:
Advisory fees		58,756
Other income		849
Restatement Adjustment [Member] \| Advisory Fees Reclassified To Other Income [Member]
Operating Revenues:
Advisory fees		(300)
Restatement Adjustment [Member] \| Other Exchange Trade Product Fees Reclassified From Advisory Fees [Member]
Operating Revenues:
Other income		300
Restatement Adjustment [Member] \| Interest Income Reclassified to Other Income Expenses [Member]
Operating Revenues:
Other income		(962)
Restatement Adjustment [Member] \| Realized and Unrealized Losses Reclassified to Other Losses Net [Member]
Operating Revenues:
Other income		261
Restatement Adjustment [Member] \| Interest Income Reclassified From Operating Revenues [Member]
Other Income/(Expenses):
Interest income		962
Restatement Adjustment [Member] \| Realized and Unrealized Losses Reclassified From Operating Revenues [Member]
Other Income/(Expenses):
Other losses, net		$ (261)

Significant Accounting Polici_5

Significant Accounting Policies - Schedule of Estimated Useful Lives of Related Assets (Detail)	3 Months Ended
	Mar. 31, 2019
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 Polici_6

Significant Accounting Policies - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Cash and cash equivalents maturity period, maximum	90 days
Short-term lease exception - Lease term	12 months

Business Combination - Addition

Business Combination - Additional Information (Detail) - USD ($)	Apr. 11, 2018	Mar. 31, 2019	Mar. 31, 2018
Acquisition related costs		$ 313,000	$ 2,062,000
Acquisition of ETFS Business [Member]
Business acquisition, cash paid	$ 253,000,000
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 of ETFS Business [Member] \| Term Loan Facility [Member]
Borrowing under term loan facility	$ 200,000,000
Acquisition of ETFS Business [Member] \| Revolving Credit Facility [Member]
Revolving credit facility maximum borrowing capacity	$ 50,000,000
Acquisition of ETFS Business [Member] \| Common Stock [Member]
Business acquisition, number of shares to be issued	15,250,000
Series A Non-Voting Convertible Preferred Stock [Member] \| Acquisition of ETFS Business [Member]
Business acquisition, number of shares to be issued	14,750

Business Combination - Summary

Business Combination - Summary of Allocation of Purchase Price (Detail) $ / shares in Units, $ in Thousands	Apr. 11, 2018USD ($)$ / sharesshares	Mar. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Business Acquisition [Line Items]
WisdomTree stock price \| $ / shares	$ 9
Goodwill		$ 85,856	$ 85,856
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	13,687
Receivables and other current assets	14,069
Intangible assets	601,247
Other current liabilities	(17,314)
Fair value of net assets acquired	611,689
Goodwill	$ 84,057
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] \| 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 - Summar_2

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 - Summar_3

Business Combination - Summary of Operating Results of ETFS since the Acquisition Date (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
Business Combinations [Abstract]
Revenues	$ 79,771
Net income	11,243
Proforma loss on revaluation of deferred consideration	$ (2,555)

Cash and Cash Equivalents - Add

Cash and Cash Equivalents - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Cash equivalents held at financial institution	$ 566	$ 24
Cash and cash equivalents held at one financial institution	34,029	34,398
International Business Segment [Member]
Liquid assets	$ 12,164	$ 11,005

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liquid investments, original maturities	90 days
Growth rate for deferred consideration	1.50%
Discounted rate for deferred consideration	10.00%
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gold forward-looking price range	$ 1,303	$ 1,294
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Gold forward-looking price range	$ 2,394	$ 2,621

Fair Value Measurements - Summa

Fair Value Measurements - Summary of Categorization of Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Liabilities:
Deferred consideration	$ 157,147	$ 161,540
Fair Value, Measurements, Recurring [Member]
Assets:
Cash equivalents	566	24
Securities owned, at fair value	6,419	8,873
Total	6,985	8,897
Liabilities:
Deferred consideration	157,147	161,540
Securities sold, but not yet purchased	1,338	1,698
Total	158,485	163,238
Fair Value, Measurements, Nonrecurring [Member]
Assets:
Thesys—Series Y preferred stock		3,080
Total		3,080
Fair Value, Inputs, Level 1 [Member] \| Fair Value, Measurements, Recurring [Member]
Assets:
Cash equivalents	566	24
Securities owned, at fair value	6,419	8,873
Total	6,985	8,897
Liabilities:
Securities sold, but not yet purchased	1,338	1,698
Total	1,338	1,698
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Recurring [Member]
Liabilities:
Deferred consideration	157,147	161,540
Total	$ 157,147	161,540
Fair Value, Inputs, Level 3 [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Assets:
Thesys—Series Y preferred stock		3,080
Total		$ 3,080

Fair Value Measurements - Sum_2

Fair Value Measurements - Summary of Reconciliation of Recurring Fair Value Measurements (Detail) - Deferred Consideration Obligation [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance	$ 161,540
Net realized losses/(gains)	3,098
Net unrealized losses/(gains)	(4,404)
Settlements	(3,087)
Ending balance	$ 157,147

Securities Owned_Sold but Not_3

Securities Owned/Sold but Not Yet Purchased - Schedule of Securities Owned/Sold But Not Yet Purchased (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Securities Owned Total	$ 6,419	$ 8,873
Securities Sold, but not yet Purchased Total	1,338	1,698
Trading Securities [Member]
Security Owned and Sold, Not yet Purchased, at Fair Value [Line Items]
Securities Owned Total	6,419	8,873
Securities Sold, but not yet Purchased Total	$ 1,338	$ 1,698

Securities Owned_Sold but Not_4

Securities Owned/Sold but Not Yet Purchased - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
Fair Value Disclosures [Abstract]
Proceeds from sale and maturity of available-for-sale securities	$ 60,498
Recognized gross realized losses	$ 716

Securities Held-to-Maturity - S

Securities Held-to-Maturity - Schedule of Securities Held-to-Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Schedule of Held-to-maturity Securities [Line Items]
Federal agency debt instruments (amortized cost)	$ 20,159	$ 20,180
Federal Agency [Member]
Schedule of Held-to-maturity Securities [Line Items]
Federal agency debt instruments (amortized cost)	$ 20,159	$ 20,180

Securities Held-to-Maturity -_2

Securities Held-to-Maturity - Schedule of Unrealized Gains, Losses and Fair Value of Securities Held-to-Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Held-to-maturity cost or amortized cost	$ 20,159	$ 20,180
Held-to-maturity gross unrealized gains	6	5
Held-to-maturity gross unrealized losses	(1,083)	(1,679)
Held-to-maturity fair value	$ 19,082	$ 18,506

Securities Held-to-Maturity -_3

Securities Held-to-Maturity - Schedule of Maturity Profile of Securities Held-to-Maturity (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Held-to-maturity due five years through ten years	$ 7,519	$ 7,521
Held-to-maturity due over ten years	12,640	12,659
Held-to-maturity cost or amortized cost	$ 20,159	$ 20,180

Note Receivables - Additional I

Note Receivables - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest rate	5.00%
Percentage of interest rate increase at the event of default	10.00%
Promissory note maturity date	Dec. 29, 2021
Interest income recognized	$ 595	$ 416
Fair Value, Inputs, Level 2 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value of notes receivable	$ 28,802		$ 27,618

Note Receivables - Summary of O

Note Receivables - Summary of Outstanding Note Receivable Balance (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total note receivable, net	$ 29,317	$ 28,722
Notes Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Note receivable (face value)	30,000	30,000
Less: Original issue discount ("OID"), unamortized	(2,378)	(2,582)
Plus: PIK interest	1,695	1,304
Total note receivable, net	$ 29,317	$ 28,722

Investments, Carried at Cost -

Investments, Carried at Cost - Details of Investments Carried at Cost (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Investment [Line Items]
Investments, carried at cost	$ 28,080	$ 28,080
AdvisorEngine [Member] \| Convertible Preferred Stock [Member]
Investment [Line Items]
Investments, carried at cost	25,000	25,000
Thesys Group, Inc [Member]
Investment [Line Items]
Investments, carried at cost	$ 3,080	$ 3,080

Investment, Carried at Cost - A

Investment, Carried at Cost - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended
	Jun. 20, 2017	Mar. 31, 2019	Dec. 31, 2018
Investment [Line Items]
Carrying value of investmet		$ 28,080	$ 28,080
AdvisorEngine [Member]
Investment [Line Items]
Ownership interest percentage		46.00%
Original fully diluted ownership interest percentage		41.00%
AdvisorEngine [Member] \| Convertible Preferred Stock [Member]
Investment [Line Items]
Carrying value of investmet		$ 25,000	25,000
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]
Number of shares purchased		2,646,062
Thesys Group, Inc [Member]
Investment [Line Items]
Carrying value of investmet		$ 3,080	$ 3,080
Thesys Group, Inc [Member] \| Convertible Preferred Stock [Member] \| Series Y Preferred Stock [Member]
Investment [Line Items]
Number of shares issued	7,797,533
Current fully diluted ownership percentage	19.00%
Liquidation preference	$ 0.231
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%

Investment - Summary of Ranges

Investment - Summary of Ranges and Weighted Averages of Significant Unobservable Inputs Used to Determine Enterprise Value (Detail) - Thesys Group, Inc [Member] - Preferred Stock [Member] - Level 3 [Member] - Income Approach Valuation Technique [Member]	12 Months Ended
	Dec. 31, 2018
Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted average cost of capital ("WACC")	3.80%
Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted average cost of capital ("WACC")	15.50%
Weighted Average [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Weighted average cost of capital ("WACC")	14.10%

Investment - Summary of Range_2

Investment - Summary of Ranges and Weighted Averages of Significant Unobservable Inputs Used to Quantitative Assessments (Detail) - Advisor Engine [Member] - Preferred Stock [Member] - Level 3 [Member]	12 Months Ended
	Dec. 31, 2018
Minimum [Member] \| Market Approach Valuation Technique [Member]
Fair Value Inputs Assets Quantitative Informations [Line Items]
Revenue multiple	4.7
Maximum [Member] \| Market Approach Valuation Technique [Member]
Fair Value Inputs Assets Quantitative Informations [Line Items]
Revenue multiple	5.4
Weighted Average [Member] \| Market Approach Valuation Technique [Member]
Fair Value Inputs Assets Quantitative Informations [Line Items]
Revenue multiple	5
Weighted Average [Member] \| Income Approach Valuation Technique [Member]
Fair Value Inputs Assets Quantitative Informations [Line Items]
Weighted average cost of capital ("WACC")	26.00%

Fixed Assets, net - Schedule of

Fixed Assets, net - Schedule of Fixed Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Less accumulated depreciation and amortization	$ (6,621)	$ (6,304)
Total	8,863	9,122
Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	2,284	2,244
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	2,218	2,218
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, Gross	$ 10,982	$ 10,964

Deferred Consideration - Additi

Deferred Consideration - Additional Information (Detail)	3 Months Ended
Deferred Consideration - Additional Information (Detail)	Mar. 31, 2019USD ($)oz	Dec. 31, 2018USD ($)
Business Acquisition [Line Items]
Fixed payment ounces of gold \| oz	2,375
Upfront consideration paid	$ 0
Deferred consideration	157,147,000	$ 161,540,000
Deferred consideration, current	11,857,000	11,765,000
Deferred consideration, non-current	$ 145,290,000	$ 149,775,000
Discount rate used to value the deferred consideration	10.00%
Contractual gold payments	$ 3,098,000
Gain/loss on revaluation of deferred consideration	$ 4,404,000
April 1, 2018 through March 31, 2058 [Member]
Business Acquisition [Line Items]
Fixed payment ounces of gold \| oz	9,500
April 1, 2058 and Thereafter [Member]
Business Acquisition [Line Items]
Fixed payment ounces of gold \| oz	6,333

Long-Term Debt - Additional Inf

Long-Term Debt - Additional Information (Detail) - USD ($)	Apr. 11, 2018	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Interest expense		$ 2,892,000
Fair Value, Inputs, Level 2 [Member]
Debt Instrument [Line Items]
Long-term debt, fair value		194,876,000	$ 196,126,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Unamortized issuance costs		$ (1,066,000)	$ (1,195,000)
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) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Term Loan Facility [Member]
Debt Instrument [Line Items]
Amount borrowed	$ 200,000	$ 200,000
Unamortized issuance costs	(4,826)	(5,408)
Carrying amount	$ 195,174	$ 194,592
Effective interest rate	5.47%	5.09%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Unamortized issuance costs	$ 1,066	$ 1,195
Carrying amount	$ 1,066	$ 1,195

Long-Term Debt - Summary of Fin

Long-Term Debt - Summary of Financial Covenant and Leverage Ratio (Detail)	Apr. 11, 2018
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	Mar. 31, 2019
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]
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]
Class of Stock [Line Items]
Shares issued in business acquisition	30,000,000
Acquisition price per share	$ 9
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] - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Preferred Units [Line Items]
Issuance of Preferred Shares	$ 132,750	$ 132,750
Less: Issuance costs	(181)	(181)
Preferred Shares – carrying value	$ 132,569	$ 132,569

Leases - Summary of additional

Leases - Summary of additional information regarding Company's Leases (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Lease cost:
Operating lease cost	$ 798	$ 743
Short-term lease cost	389	284
Total lease cost	1,187	$ 1,027
Other information:
Cash paid for amounts included in the measurement of operating liabilities (operating leases)	$ 881
Weighted-average remaining lease term (in years) – operating leases	10 years
Weighted-average discount rate – operating leases	6.30%

Leases - Additional Information

Leases - Additional Information (Detail) - USD ($) $ in Thousands	Aug. 21, 2024	Mar. 31, 2019	Jan. 01, 2019
Right of use asset		$ 19,446	$ 19,827
Lease liability		$ 24,355	$ 24,817
Operating lease notice to landlord before cancellation		12 months
Scenario, Forecast [Member]
Operating lease cancellation cost	$ 4,236
Japan Office [Member]
Operating lease, impairment loss		$ 572
US Office [Member]
Operating lease, standby letter of credit		$ 1,384

Leases - Summary of future mini

Leases - Summary of future minimum lease payments (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 31, 2018
Lessee Disclosure [Abstract]
Remainder	$ 2,723	$ 3,072
2019		3,764
2020	3,695	3,516
2021	2,958	3,146
2022	2,958	2,958
2023	2,958	20,599
2024	17,641
Total future minimum lease payments (undiscounted)	$ 32,933	$ 37,055

Leases - Summary of Reconciles

Leases - Summary of Reconciles future minimum lease payments (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Mar. 31, 2018
Amounts recognized in the Company's Consolidated Balance Sheet
Lease liability – short term	$ 3,651
Lease liability – long term	20,704
Subtotal	24,355	$ 24,817
Difference between undiscounted and discounted cash flows	8,578
Total future minimum lease payments (undiscounted)	$ 32,933		$ 37,055

Variable Interest Entity - Summ

Variable Interest Entity - Summary of Information about Variable Interests (Detail) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Carrying Amount - Assets
Preferred stock	$ 25,000,000	$ 25,000,000
Note receivable - unsecured	29,317,000	28,722,000
Total carrying amount - Assets	54,317,000	53,722,000
Maximum exposure to loss	$ 54,317,000	$ 53,722,000

Revenues from Contracts with _3

Revenues from Contracts with Customers - Summary of Revenues from Contracts with Customers (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items]
Total operating revenues	$ 65,485	$ 58,904
Advisory Fees [Member]
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items]
Total operating revenues	64,840	58,456
Other Income [Member]
Revenues Categorized as Revenues from Contracts with Customers and Other Sources of Revenues [Line Items]
Total operating revenues	$ 645	$ 448

Related Party Transactions - Su

Related Party Transactions - Summary of Accounts Receivable from Related Parties (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Accounts receivable from related parties	$ 25,112	$ 24,670
WisdomTree Trust [Member]
Related Party Transaction [Line Items]
Accounts receivable from related parties	15,036	14,678
ETFS Issuers [Member]
Related Party Transaction [Line Items]
Accounts receivable from related parties	8,786	8,779
Boost Issuer PLC And WisdomTree Issuer plc [Member]
Related Party Transaction [Line Items]
Accounts receivable from related parties	1,004	951
WisdomTree Asset Management Canada, Inc [Member]
Related Party Transaction [Line Items]
Accounts receivable from related parties	189	167
WisdomTree Commodity Services LLC [Member]
Related Party Transaction [Line Items]
Accounts receivable from related parties	$ 97	$ 95

Related Party Transactions - _2

Related Party Transactions - Summary of Revenues from Advisory Services Provided to Related Parties (Detail) - Advisory Services [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Related Party Transaction [Line Items]
Revenues from advisory services	$ 64,840	$ 58,456
WisdomTree Trust [Member]
Related Party Transaction [Line Items]
Revenues from advisory services	42,223	55,202
ETFS Issuers [Member]
Related Party Transaction [Line Items]
Revenues from advisory services	19,273
Boost Issuer PLC And WisdomTree Issuer plc [Member]
Related Party Transaction [Line Items]
Revenues from advisory services	2,504	2,626
WisdomTree Asset Management Canada, Inc [Member]
Related Party Transaction [Line Items]
Revenues from advisory services	546	311
WisdomTree Commodity Services LLC [Member]
Related Party Transaction [Line Items]
Revenues from advisory services	$ 294	$ 317

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Gain (Loss) on Investments	$ 353	$ 9
WisdomTree ETF [Member]
Related Party Transaction [Line Items]
Investment	$ 4,940		$ 7,117

Stock-Based Awards - Additional

Stock-Based Awards - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Jun. 20, 2016	Mar. 31, 2019	Mar. 31, 2018
PRSU
Shares of common stock authorized to issue under equity award plan	10,000,000
Stock-based compensation expense		$ 3,072	$ 3,309
Below 25th Percentile [Member]
PRSU
Shares granted and outstanding, Vesting percentage		0.00%
At 50th Percentile [Member]
PRSU
Shares granted and outstanding, Vesting percentage		100.00%
At 100th Percentile [Member]
PRSU
Shares granted and outstanding, Vesting percentage		200.00%
Performance Based Restricted Stock Unit [Member] \| Maximum [Member]
PRSU
Shares granted and outstanding, Vesting percentage		200.00%
Performance Based Restricted Stock Unit [Member] \| Minimum [Member]
PRSU
Shares granted and outstanding, Vesting percentage		0.00%

Stock-Based Awards - Summary of

Stock-Based Awards - Summary of Unrecognized Stock-Based Compensation Expense and Average Remaining Vesting Period (Detail) - Employees and Directors [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average Remaining Vesting Period	2 years 5 months 23 days
Unrecognized Stock-Based Compensation	$ 24,012

Stock-Based Awards - Summary _2

Stock-Based Awards - Summary of Stock Options, Restricted Stock and Restricted Stock Unit Activity (Detail)	3 Months Ended
	Mar. 31, 2019shares
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, beginning balance	570,537
Options, Granted	0
Options, Exercised/vested	(20,000)
Options, Forfeitures	0
Options, ending balance	550,537
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock, beginning balance	1,957,102
Restricted Stock, Granted	2,233,878
Restricted Stock, Exercised/vested	(827,721)
Restricted Stock, Forfeitures	(93,194)
Restricted Stock, ending balance	3,270,065
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock, beginning balance	9,494
Restricted Stock, Granted	35,283
Restricted Stock, Exercised/vested	(4,341)
Restricted Stock, Forfeitures	0
Restricted Stock, ending balance	40,436
Performance Based Restricted Stock Unites (PRSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Stock, beginning balance	0
Restricted Stock, Granted	270,872
Restricted Stock, Exercised/vested	0
Restricted Stock, Forfeitures	0
Restricted Stock, ending balance	270,872

Stock-Based Awards - Summary _3

Stock-Based Awards - Summary of Stock Options, Restricted Stock and Restricted Stock Unit Activity (Parenthetical) (Detail) - Performance Based Restricted Stock Unit [Member]	3 Months Ended
	Mar. 31, 2019
PRSUs - Monte Carlo Inputs
Historical volatility - Average	28.00%
Shares granted and outstanding, Risk free interest rate	2.56%
Shares granted and outstanding, Expected dividend rate	0.00%
Maximum [Member]
PRSUs - Monte Carlo Inputs
Shares granted and outstanding, Vesting percentage	200.00%
Historical volatility - Average	42.00%
Minimum [Member]
PRSUs - Monte Carlo Inputs
Shares granted and outstanding, Vesting percentage	0.00%
Historical volatility - Average	22.00%

Earnings Per Share - Reconcilia

Earnings Per Share - Reconciliation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income	$ 8,824	$ 9,424
Less: Income distributed to participating securities	(544)	(71)
Less: Undistributed income allocable to participating securities	(391)	(85)
Net income available to common stockholders	$ 7,889	$ 9,268
Weighted average common shares (in thousands)	151,625	135,329
Basic earnings per share	$ 0.05	$ 0.07
Net income	$ 8,824	$ 9,424
Weighted average common shares	151,625	135,329
Dilutive effect of common stock equivalents	15,186	1,139
Weighted average diluted shares	166,811	136,468
Diluted earnings per share	$ 0.05	$ 0.07

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Detail) - shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Anti-dilutive common stock equivalents excluded from calculation of diluted earnings per share	3,495,080	1,101,513

Income Taxes - Schedule of Chan

Income Taxes - Schedule of Changes in Balance of Gross Unrecognized Tax Benefits (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Income Tax Contingency [Line Items]
Beginning balance	$ 34,876
Decrease—Lapse of statute of limitations	(4,309)
Increases	101
Foreign currency translation	925
Ending balance	31,593
Unrecognized Tax Benefits [Member]
Income Tax Contingency [Line Items]
Beginning balance	28,101
Decrease—Lapse of statute of limitations	(2,999)
Foreign currency translation	745
Ending balance	25,847
Interest And Penalties [Member]
Income Tax Contingency [Line Items]
Beginning balance	6,775
Decrease—Lapse of statute of limitations	(1,310)
Increases	101
Foreign currency translation	180
Ending balance	$ 5,746

Income Taxes - Summary of Defer

Income Taxes - Summary of Deferred Tax Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Deferred tax assets:
NOLs – Foreign	$ 8,222	$ 6,605
Goodwill and intangible assets	1,794	1,841
Accrued expenses	1,358	2,699
Stock-based compensation	1,189	2,673
Net lease liability	1,172	1,184
Capital losses	794	794
NOLs – U.S.	635	762
Other	37	40
Deferred tax assets	15,201	16,598
Deferred tax liabilities:
Fixed assets and prepaid assets	1,439	1,433
Unrealized gains	748	724
Deferred tax liabilities	2,187	2,157
Total deferred tax assets less deferred tax liabilities	13,014	14,441
Less: valuation allowance	(9,016)	(7,399)
Deferred tax assets, net	$ 3,998	$ 7,042

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Schedule Of Income Tax [Line Items]
Pre-tax federal net operating losses that expire	$ 2,622
Pre-tax federal net operating losses expiration date	2024
Tax effected NOLs - Foreign	$ 8,222		$ 6,605
Federal statutory rate	21.00%	21.00%
Accrued for unrecognized tax benefits and interest/penalties related to a tax position claimed or expected to be claimed on a tax return	$ 31,593		$ 34,876
Unrecognized tax benefits that would impact effective tax rate	25,847
Pre-tax capital loss	572
Income Tax Expense (Benefit)	(1,049)	$ 4,498
Reduction in unrecognized tax benefits	$ 4,309
Estimated effective rate	(13.50%)	32.30%
Foreign Tax Authority [Member]
Schedule Of Income Tax [Line Items]
Pre-tax federal net operating losses that expire	$ 4,050
Operating loss Expiration Period	expire between the years 2036 and 2039
Advisor Engine [Member]
Schedule Of Income Tax [Line Items]
Pre-tax capital loss	$ 3,278
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	$ 31,593

Shares Repurchased - Additional

Shares Repurchased - Additional Information (Detail) - USD ($)	Apr. 24, 2019	Mar. 31, 2019	Mar. 31, 2018	Apr. 11, 2018
Class of Stock [Line Items]
Repurchased common stock, value		$ 2,005,000	$ 734,000
Maximum [Member]
Class of Stock [Line Items]
Total Leverage Ratio				1.75%
Three-Year Share Repurchase Program [Member]
Class of Stock [Line Items]
Repurchased common stock, shares		311,213,000	60,508,000
Repurchased common stock, value		$ 2,005,000	$ 734,000
Dollar amount remaining available for future share repurchases		$ 83,724,000
Three-Year Share Repurchase Program [Member] \| Subsequent Event [Member]
Class of Stock [Line Items]
Share repurchase program, extended term date	Apr. 27, 2022

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Summary of Goodwill by Reporting Unit (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Goodwill [Line Items]
Beginning balance	$ 85,856
Ending balance	85,856
Reportable Subsegments [Member]
Goodwill [Line Items]
Beginning balance	85,856
Changes	0
Ending balance	85,856
Reportable Subsegments [Member] \| European Business Segment [Member]
Goodwill [Line Items]
Beginning balance	84,057
Changes	0
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 Asset_3

Goodwill and Intangible Assets - Additional Information (Detail) $ in Thousands, $ in Thousands	Apr. 11, 2018USD ($)	Mar. 31, 2019USD ($)	Dec. 31, 2017USD ($)Fund	Dec. 31, 2017CAD ($)Fund	Dec. 31, 2018USD ($)
Indefinite-lived Intangible Assets [Line Items]
Intangible asset related to its customary advisory agreement		$ 603,251			$ 603,209
Questrade ETFs [Member]
Indefinite-lived Intangible Assets [Line Items]
Intangible asset related to its customary advisory agreement		2,004			1,962
Questrade ETFs [Member] \| WisdomTree Asset Management Canada, Inc [Member]
Indefinite-lived Intangible Assets [Line Items]
Number of ETF acquired by company \| Fund			8	8
Business acquisition, cash paid			$ 2,132	$ 2,675
Acquisition Of Etfs Business [Member]
Indefinite-lived Intangible Assets [Line Items]
Business acquisition, cash paid	$ 253,000
Intangible asset related to its customary advisory agreement		$ 601,247			$ 601,247
Weighted average cost of capital percentage	11.60%
Acquisition completion date		Apr. 11, 2018
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 Asset_4

Goodwill and Intangible Assets - Summary of Indefinite-lived Intangible Assets (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Indefinite-lived Intangible Assets [Line Items]
Beginning balance	$ 603,209
Foreign currency translation	42
Ending balance	603,251
Acquisition Of Etfs Business [Member]
Indefinite-lived Intangible Assets [Line Items]
Beginning balance	601,247
Ending balance	601,247
Questrade ETFs [Member]
Indefinite-lived Intangible Assets [Line Items]
Beginning balance	1,962
Foreign currency translation	42
Ending balance	$ 2,004

Segment Reporting - Reportable

Segment Reporting - Reportable Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Revenues:
Total revenues	$ 65,485	$ 58,904
Total operating expenses	(54,802)	(45,683)
Other income/(expenses)
Interest expense	(2,892)
Interest income	779	962
Gain on revaluation of deferred consideration	4,404
Impairment	572
Other gains/(losses), net	(4,627)	(261)
Income/(loss) before taxes	7,775	13,922
Advisory Fees [Member]
Operating Revenues:
Total revenues	64,840	58,456
U.S. Business segment [Member]
Operating Revenues:
Other income	106	147
Total revenues	42,623	55,665
Total operating expenses	(37,176)	(39,030)
Other income/(expenses)
Interest expense	(192)
Interest income	779	962
Impairment	(572)
Other gains/(losses), net	145	(226)
Other income/(expenses)	160	736
Income/(loss) before taxes	5,607	17,371
U.S. Business segment [Member] \| Advisory Fees [Member]
Operating Revenues:
Total revenues	42,517	55,518
International Business Segment [Member]
Operating Revenues:
Other income	539	301
Total revenues	22,862	3,239
Total operating expenses	(17,626)	(6,653)
Other income/(expenses)
Interest expense	(2,700)
Gain on revaluation of deferred consideration	4,404
Other gains/(losses), net	(4,772)	(35)
Other income/(expenses)	(3,068)	(35)
Income/(loss) before taxes	2,168	(3,449)
International Business Segment [Member] \| Advisory Fees [Member]
Operating Revenues:
Total revenues	$ 22,323	$ 2,938

Subsequent Events - Additional

Subsequent Events - Additional Information (Detail) - USD ($)	Apr. 11, 2019	Mar. 31, 2019
Convertible note bears interest rate		5.00%
Convertible Debt Securities [Member] \| Subsequent Event [Member]
Consideration for a convertible note	$ 1,540
Convertible note bears interest rate	3.00%
Convertible Debt Securities [Member] \| Subsequent Event [Member] \| Qualified Financing [Member]
Debt instrument, convertible, terms of conversion feature	at a price per share equal to 80% of the price per share sold in such transaction
Convertible Debt Securities [Member] \| Subsequent Event [Member] \| Corporate Transaction [Member]
Debt instrument, convertible, terms of conversion feature	convertible note would be repaid in cash from the proceeds of such transaction in the amount of 1.5 times the outstanding principal amount, plus any accrued and unpaid interest
Convertible Debt Securities [Member] \| Subsequent Event [Member] \| Non Qualified Non Corporate [Member]
Debt instrument, convertible, terms of conversion feature	convertible note is repaid at a rate of 1.25 times the outstanding principal amount, plus accrued and unpaid interest