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Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Aug. 31, 2019
Entity Registrant Name dei_EntityRegistrantName ETF Series Solutions
Entity Central Index Key dei_EntityCentralIndexKey 0001540305
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Dec. 26, 2019
Document Effective Date dei_DocumentEffectiveDate Jan. 01, 2020
Prospectus Date rr_ProspectusDate Jan. 01, 2020
Entity Inv Company Type dei_EntityInvCompanyType N-1A
Vident Core U.S. Bond Strategy ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Vident Core U.S. Bond Strategy ETF®
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Vident Core U.S. Bond Strategy ETF (the “Fund” or the “U.S. Bond Fund”) seeks to track the performance, before fees and expenses, of the Vident Core U.S. Bond IndexTM (the “Index” or the “U.S. Bond Index”).
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The following table describes the fees and expenses you may pay if you buy, hold, and sell shares of the Fund (“Shares”). This table and the Example below do not include the brokerage commissions that investors may pay on their purchases and sales of Shares.
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund’s performance. For the fiscal year ended August 31, 2019, the Fund’s portfolio turnover rate was 384% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 384.00%
Expense Exchange Traded Fund Commissions [Text] rr_ExpenseExchangeTradedFundCommissions This table and the Example below do not include the brokerage commissions that investors may pay on their purchases and sales of Shares.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets provided in the Financial Highlights section of the Prospectus, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.
Expense Example [Heading] rr_ExpenseExampleHeading Expense Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your Shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies of the Fund
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund employs a “passive management” – or indexing – investment approach designed to track the performance of the Index.
The Vident Core U.S. Bond IndexTM  
The Vident Core U.S. Bond IndexTM (Bloomberg:VUBDX) seeks to improve the overall mix of credit quality, interest rate and yield as compared to traditional U.S. core bond indices. The Index diversifies interest rate and credit risks across all core U.S. bond sectors, including U.S. Treasuries, U.S. agency securities, U.S. agency mortgage backed securities (“MBS”), and investment-grade corporate bonds, as well as non-core fixed income sectors such as high-yield corporate bonds (also known as “junk bonds”) and Treasury Inflation-Protected Securities (“TIPS”). While diversification among sectors is an important factor that will drive the risk/return profile of the strategy, another source of risk management is derived from the rules-based process that systematically over- or under-weights each sector based on valuations of each sector, historical relative valuations across sectors, sector default rates, and other quantitative factors. Within the investment grade and high yield corporate sectors, the strategy seeks to improve corporate bond exposures by screening for companies with relatively stronger leadership, governance, and creditworthiness factors. Within each sector, individual bonds are weighted based on a combination of yield, duration (i.e., interest rate sensitivity), creditworthiness, leadership, and governance factors, rather than amount of debt/bonds outstanding. The Index also seeks to improve liquidity by eliminating small issues and non-U.S. issuers.
The Index limits exposure to each of the high-yield corporate bonds and TIPS sectors to 20% and 15% of the Index, respectively. The Index will generally have an effective duration of three to seven years and will generally have an average credit quality of investment grade.
All rules are systematized and rely on data available at the end of each rebalancing period. The Index is rebalanced monthly and reconstituted quarterly in January, April, July, and October. As of December 13, 2019, the Index was comprised of 251 component securities.
The Index was created on November 30, 2015 by Vident Financial, LLC, the Index Provider, for use by the Fund.
The Fund’s Investment Strategy
The Fund attempts to invest all, or substantially all, of its assets in the bonds that make up the Index. The Fund expects to use a “replication” strategy to achieve its investment objective, meaning it may invest in all of the component securities of the Index, but may, when the sub-adviser believes it is in the best interests of the Fund, use a “representative sampling” strategy, meaning it may invest in a sample of the securities in the Index whose risk, return and other characteristics closely resemble the risk, return and other characteristics of the Index as a whole.
The Fund may utilize the “To Be Announced” (“TBA”) market for MBS investments. The TBA market allows investors to gain exposure to MBS with certain broad characteristics (maturity, coupon, age) without taking delivery of the actual securities until the settlement day which is once every month. In addition, the Fund may utilize the TBA roll market, in which one sells, in the TBA market, the security for current month settlement, while simultaneously committing to buy the same TBA security for next month settlement. The Fund may utilize the TBA roll market for extended periods of time without taking delivery of the physical securities.
Under normal circumstances, at least 80% of the Fund’s total assets (exclusive of collateral held from securities lending) will be invested in the component securities of the Index and TBA securities representing such component securities. Vident Advisory, LLC (“Vident Advisory” or the “Adviser”), the Fund’s investment adviser, believes, over time, the correlation between the Fund’s performance and that of the Index, before fees and expenses, will be 95% or better.
To the extent the Index concentrates (i.e., holds more than 25% of its total assets) in the securities of a particular industry or group of related industries, the Fund will concentrate its investments to approximately the same extent as the Index.
Risk [Heading] rr_RiskHeading Principal Risks of Investing in the Fund
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
The principal risks of investing in the Fund are summarized below. The principal risks are presented in alphabetical order to facilitate finding particular risks and comparing them with other funds. Each risk summarized below is considered a “principal risk” of investing in the Fund, regardless of the order in which it appears. As with any investment, there is a risk that you could lose all or a portion of your investment in the Fund. Some or all of these risks may adversely affect the Fund’s net asset value per share (“NAV”), trading price, yield, total return and/or ability to meet its objectives. For more information about the risks of investing in the Fund, see the section in the Fund’s Prospectus titled “Additional Information About the Funds.”
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Call Risk. During periods of falling interest rates, an issuer of a callable bond held by the Fund may “call” or repay the security before its stated maturity, and the Fund may have to reinvest the proceeds at lower interest rates, resulting in a decline in the Fund's income.
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Cash Redemption Risk. The Fund’s investment strategy may require it to redeem shares for cash or to otherwise include cash as part of its redemption proceeds. The Fund may be required to sell or unwind portfolio investments to obtain the cash needed to distribute redemption proceeds. This may cause the Fund to recognize a capital gain that it might not have recognized if it had made a redemption in-kind. As a result, the Fund may pay out higher annual capital gain distributions than if the in-kind redemption process was used.
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Credit Risk. Debt issuers and other counterparties may not honor their obligations or may have their debt downgraded by ratings agencies.
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ETF Risks. The Fund is an ETF, and, as a result of an ETF’s structure, it is exposed to the following risks:
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Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to NAV and possibly face delisting: (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions.
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Costs of Buying or Selling Shares. Due to the costs of buying or selling Shares, including brokerage commissions imposed by brokers and bid/ask spreads, frequent trading of Shares may significantly reduce investment results and an investment in Shares may not be advisable for investors who anticipate regularly making small investments.
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Shares May Trade at Prices Other Than NAV. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Shares will approximate the Fund’s NAV, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Shares or during periods of market volatility. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Shares in the secondary market, in which case such premiums or discounts may be significant.
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Trading. Although Shares are listed for trading on NYSE Arca, Inc. (the “Exchange”) and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that Shares will trade with any volume, or at all, on any stock exchange. In stressed market conditions, the liquidity of Shares may begin to mirror the liquidity of the Fund’s underlying portfolio holdings, which can be significantly less liquid than Shares.
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Extension Risk. During periods of rising interest rates, certain debt obligations will be paid off substantially more slowly than originally anticipated and the value of those securities may fall sharply, resulting in a decline in the Fund’s income and potentially in the value of the Fund’s investments.
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Government Obligations Risk. No assurance can be given that the U.S. government will provide financial support to U.S. government-sponsored agencies or instrumentalities where it is not obligated to do so by law, such as the Federal National Mortgage Association (“Fannie Mae”) and the Federal Home Loan Mortgage Corporation (“Freddie Mac”). Securities issued by Fannie Mae and Freddie Mac have historically been supported only by the discretionary authority of the U.S. government. While the U.S. government provides financial support to various U.S. government-sponsored agencies and instrumentalities, such as Fannie Mae and Freddie Mac, no assurance can be given that it will always do so. In September 2008, at the direction of the U.S. Department of the Treasury, Fannie Mae and Freddie Mac were placed into conservatorship under the Federal Housing Finance Agency (“FHFA”), an independent regulator, and they remain in such status as of the date of this Prospectus. The U.S. government also took steps to provide additional financial support to Fannie Mae and Freddie Mac.
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High-Yield Securities Risk. High-yield securities (also known as “junk bonds”) carry a greater degree of risk and are considered speculative by the major credit rating agencies. High-yield securities may be issued by companies that are restructuring, are smaller and less creditworthy, or are more highly indebted than other companies. This means that they may have more difficulty making scheduled payments of principal and interest. Changes in the value of high-yield securities are influenced more by changes in the financial and business position of the issuing company than by changes in interest rates when compared to investment grade securities. High-yield securities have greater volatility because there is less certainty that principal and interest payments will be made as scheduled. The Fund's investments in high-yield securities expose it to a substantial degree of credit risk. These investments are considered speculative under traditional investment standards. Prices of high-yield securities will rise and fall primarily in response to actual or perceived changes in the issuer's financial health, although changes in market interest rates also will affect prices. High-yield securities may experience reduced liquidity and sudden and substantial decreases in price.
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Interest Rate Risk. An increase in interest rates may cause the value of fixed-income securities held by the Fund to decline. The Fund may be subject to a greater risk of rising interest rates due to the current period of historically low rates and the effect of potential government fiscal policy initiatives and resulting market reaction to those initiatives.
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Issuer-Specific Risk. Issuer-specific events, including changes in the financial condition of an issuer, can have a negative impact on the value of the Fund.
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Liquidity Risk. Liquidity risk exists when particular investments are difficult to purchase or sell. This can reduce the Fund's returns because the Fund may be unable to transact at advantageous times or prices.
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Market Risk. The trading prices of debt securities and other instruments fluctuate in response to a variety of factors. The Fund’s NAV and market price may fluctuate significantly in response to these and other factors. As a result, an investor could lose money over short or long periods of time.
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Mortgage- and Asset-Backed Securities Risk. The Fund may invest in U.S. government agency-backed mortgage- and asset-backed securities. Mortgage- and asset-backed securities are subject to interest rate risk. Modest movements in interest rates (both increases and decreases) may quickly and significantly reduce the value of certain types of these securities. When interest rates fall, mortgage- and asset-backed securities may be subject to prepayment risk. When interest rates rise, certain types of mortgage- and asset-backed securities are subject to extension risk. Mortgage- and asset-backed securities can also be subject to the risk of default on the underlying residential or commercial mortgage(s) or other assets.
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Passive Investment Risk. The Fund invests in the securities included in, or representative of, the Index regardless of their investment merit. The Fund does not attempt to outperform its Index or take defensive positions in declining markets. As a result, the Fund’s performance may be adversely affected by a general decline in the market segments relating to its Index.
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Portfolio Turnover Risk. The Fund may trade all or a significant portion of the securities in its portfolio in connection with each rebalance and reconstitution of its Index. A high portfolio turnover rate increases transaction costs, which may increase the Fund’s expenses. Frequent trading may also cause adverse tax consequences for investors in the Fund due to an increase in short-term capital gains.
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Prepayment Risk. This is the risk that a borrower will prepay some or the entire principal owed to the Fund. If that happens, the Fund may have to replace the security by investing the proceeds in a security with a lower yield. This could reduce the share price and income distributions of the Fund.
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Sector Risk. To the extent the Fund invests more heavily in particular sectors of the economy, its performance will be especially sensitive to developments that significantly affect those sectors.
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TBA Securities and Rolls Risk. TBA transactions are subject to increased credit risk and increased overall investment exposure. TBA rolls involve the risk that the Fund’s counterparty will be unable to deliver the mortgage-backed securities underlying the TBA roll at the fixed time. If the buyer files for bankruptcy or becomes insolvent, the buyer or its representative may ask for and receive an extension of time to decide whether to enforce the Fund’s repurchase obligation. In addition, the Fund earns interest by investing the transaction proceeds during the roll period. TBA roll transactions may have the effect of creating leverage in the Fund’s portfolio.
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Tracking Error Risk. As with all index funds, the performance of the Fund and its Index may differ from each other for a variety of reasons. For example, the Fund incurs operating expenses and portfolio transaction costs not incurred by the Index. In addition, the Fund may not be fully invested in the securities of the Index at all times or may hold securities not included in the Index.
Risk Lose Money [Text] rr_RiskLoseMoney As with any investment, there is a risk that you could lose all or a portion of your investment in the Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following performance information indicates some of the risks of investing in the Fund. The bar chart shows the Fund’s performance for calendar years ended December 31. The table illustrates how the Fund’s average annual returns for the 1-year and since inception periods compare with those of a broad measure of market performance and the indexes tracked by the Fund during the applicable period. The Fund’s past performance, before and after taxes, does not necessarily indicate how it will perform in the future. Updated performance information is available on the Fund’s website at www.videntfunds.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information indicates some of the risks of investing in the Fund.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.videntfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance, before and after taxes, does not necessarily indicate how it will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
For the year-to-date period ended September 30, 2019, the Fund’s total return was 9.06%.
During the period of time shown in the bar chart, the Fund’s highest quarterly return was 3.06% for the quarter ended March 31, 2016, and the lowest quarterly return was -3.45% for the quarter ended December 31, 2016.
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date period ended
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2019
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 9.06%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2016
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 3.06%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2016
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (3.45%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns For the Periods Ended December 31, 2018
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates during the period covered by the table above and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Shares through tax-deferred arrangements such as an individual retirement account (“IRA”) or other tax-advantaged accounts.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher In certain cases, the figure representing “Return After Taxes on Distributions and Sale of Shares” may be higher than the other return figures for the same period. A higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates during the period covered by the table above and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Shares through tax-deferred arrangements such as an individual retirement account (“IRA”) or other tax-advantaged accounts. In certain cases, the figure representing “Return After Taxes on Distributions and Sale of Shares” may be higher than the other return figures for the same period. A higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.
Vident Core U.S. Bond Strategy ETF | Vident Core U.S. Bond Index/Vident Core U.S. Bond Strategy Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Vident Core U.S. Bond Index/Vident Core U.S. Bond Strategy Index (reflects no deduction for fees, expenses, or taxes) [1]
1 Year rr_AverageAnnualReturnYear01 (0.21%) [1]
Since Inception rr_AverageAnnualReturnSinceInception 1.88% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 15, 2014 [1]
Vident Core U.S. Bond Strategy ETF | FTSE Broad Investment Grade Bond Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel FTSE Broad Investment Grade Bond Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 (0.01%)
Since Inception rr_AverageAnnualReturnSinceInception 1.58%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 15, 2014
Vident Core U.S. Bond Strategy ETF | Vident Core U.S. Bond Strategy ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol VBND
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.41%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets none
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02% [2]
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.43%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 44
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 138
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 241
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 542
Annual Return 2015 rr_AnnualReturn2015 0.38%
Annual Return 2016 rr_AnnualReturn2016 2.38%
Annual Return 2017 rr_AnnualReturn2017 2.85%
Annual Return 2018 rr_AnnualReturn2018 (0.78%)
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (0.78%)
Since Inception rr_AverageAnnualReturnSinceInception 1.00%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 15, 2014
Vident Core U.S. Bond Strategy ETF | Vident Core U.S. Bond Strategy ETF | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 (1.90%)
Since Inception rr_AverageAnnualReturnSinceInception 0.06%
Vident Core U.S. Bond Strategy ETF | Vident Core U.S. Bond Strategy ETF | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Shares
1 Year rr_AverageAnnualReturnYear01 (0.47%)
Since Inception rr_AverageAnnualReturnSinceInception 0.35%
Vident Core U.S. Equity Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Vident Core U.S. Equity Fund®
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Vident Core U.S. Equity Fund (the “Fund” or “U.S. Equity Fund”) seeks to track the performance, before fees and expenses, of the Vident Core U.S. Stock IndexTM (the “Index” or the “U.S. Stock Index”).
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The following table describes the fees and expenses you may pay if you buy, hold, and sell shares of the Fund (“Shares”). This table and the Example below do not include the brokerage commissions that investors may pay on their purchases and sales of Shares.
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund’s performance. For the fiscal year ended August 31, 2019, the Fund’s portfolio turnover rate was 71% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 71.00%
Expense Exchange Traded Fund Commissions [Text] rr_ExpenseExchangeTradedFundCommissions This table and the Example below do not include the brokerage commissions that investors may pay on their purchases and sales of Shares.
Expense Example [Heading] rr_ExpenseExampleHeading Expense Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your Shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies of the Fund
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund employs a “passive management” – or indexing – investment approach designed to track the performance of the Index.
The Vident Core U.S. Stock IndexTM  
The Index is a rules-based, systematic strategy index comprised of equity securities of issuers domiciled and traded in the United States. The starting universe of eligible companies in the Index consists of U.S.-listed common stock of U.S. companies with market capitalizations of at least $1 billion ($800 million for companies already in the Index), meeting certain minimum liquidity requirements, and not structured as master limited partnerships. The universe of eligible companies is then screened to remove companies with significant accounting risks, governance risks, or other extreme risks, as described below.
The Index uses a forensic accounting model to score and rank companies in the Index universe based on a variety of accounting-related metrics (e.g., revenue recognition, earnings quality, changes in accruals, depreciation to capital expenditures, changes in days sales outstanding). The forensic accounting model eliminates the weakest 10% of companies from the Index universe.
The Index also assesses the corporate governance policies and practices of companies in the Index universe and scores such companies based on the number of such risks identified. Companies within each sector with the worst corporate governance scores are eliminated. Up to 10% of the companies in the Index universe may be eliminated by this screen.
Finally, the Index assesses companies in the Index universe for other extreme risks by identifying extraordinary events that may place shareholders’ capital at risk. Such extreme risks may include:
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A senior executive has been dismissed or faces prosecution for personal misconduct or misrepresentation
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The company has been late in its U.S. Securities and Exchange filings sometime in the past 12 months
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The company has come under investigation, or been subject to fine, settlement, or conviction for issues related to securities fraud, misrepresentation, or deficiencies in investor protection sometime in the past two years
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The company is experiencing difficulties obtaining needed financing or refinancing support
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The company is in breach of existing debt covenants
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The company is under threat of exchange delisting
Any companies flagged for any of the above extreme risks are removed from the Index universe.
The stocks remaining in the resulting universe are then evaluated, scored and ranked utilizing a proprietary multi-factor model, where each factor seeks to score different stock attributes (such as valuation, quality and momentum). At the time of each reconstitution, the stocks in the Index are weighted based on their relative scores, subject to a maximum allocation of 0.5% for any individual stock and certain liquidity thresholds. Overall sector weights are established based on the market capitalization of the universe of U.S.-listed common stocks of U.S. companies at the time of each reconstitution of the Index. The following are the major market sectors included in the Index: communication services, consumer discretionary, consumer staples, energy, financials, health care, industrials, information technology, materials, real estate, and utilities. A sector is comprised of multiple industries. For example, the energy sector is comprised of companies in, among others, the natural gas, oil, and petroleum industries.
All rules are systematized and rely on data available at the end of each rebalancing period. The Index is reconstituted and rebalanced semi-annually in January and July. As of December 13, 2019, the Index was comprised of 226 component securities.
The Index was created on December 31, 2014 by Vident Financial, LLC, the Index Provider, for use by the Fund.
The Fund’s Investment Strategy
The Fund attempts to invest all, or substantially all, of its assets in the common stocks that make up the Index. The Fund will generally use a “replication” strategy to achieve its investment objective, meaning it may invest in all of the component securities of the Index, but may, when the sub-adviser believes it is in the best interests of the Fund, use a “representative sampling” strategy, meaning it may invest in a sample of the securities in the Index whose risk, return and other characteristics closely resemble the risk, return and other characteristics of the Index as a whole.
Under normal circumstances, at least 80% of the Fund’s total assets (exclusive of collateral held from securities lending) will be invested in the component securities of the Index. Vident Advisory, LLC (“Vident Advisory” or the “Adviser”), the Fund’s investment adviser, expects that, over time, the correlation between the Fund’s performance and that of the Index, before fees and expenses, will be 95% or better.
To the extent the Index concentrates (i.e., holds more than 25% of its total assets) in the securities of a particular industry or group of related industries, the Fund will concentrate its investments to approximately the same extent as the Index.
Risk [Heading] rr_RiskHeading Principal Risks of Investing in the Fund
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
The principal risks of investing in the Fund are summarized below. The principal risks are presented in alphabetical order to facilitate finding particular risks and comparing them with other funds. Each risk summarized below is considered a “principal risk” of investing in the Fund, regardless of the order in which it appears. As with any investment, there is a risk that you could lose all or a portion of your investment in the Fund. Some or all of these risks may adversely affect the Fund’s net asset value per share (“NAV”), trading price, yield, total return and/or ability to meet its objectives. For more information about the risks of investing in the Fund, see the section in the Fund’s Prospectus titled “Additional Information About the Funds.”
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Equity Market Risk. The equity securities held in the Fund’s portfolio may experience sudden, unpredictable drops in value or long periods of decline in value. This may occur because of factors that affect securities markets generally or factors affecting specific issuers, industries, or sectors in which the Fund invests. Common stocks are generally exposed to greater risk than other types of securities, such as preferred stock and debt obligations, because common stockholders generally have inferior rights to receive payment from issuers.
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ETF Risks. The Fund is an ETF, and, as a result of an ETF’s structure, it is exposed to the following risks:
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Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to NAV and possibly face delisting: (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions.
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Costs of Buying or Selling Shares. Due to the costs of buying or selling Shares, including brokerage commissions imposed by brokers and bid/ask spreads, frequent trading of Shares may significantly reduce investment results and an investment in Shares may not be advisable for investors who anticipate regularly making small investments.
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Shares May Trade at Prices Other Than NAV. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Shares will approximate the Fund’s NAV, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Shares or during periods of market volatility. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Shares in the secondary market, in which case such premiums or discounts may be significant.
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Trading. Although Shares are listed for trading on NYSE Arca, Inc. (the “Exchange”) and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that Shares will trade with any volume, or at all, on any stock exchange. In stressed market conditions, the liquidity of Shares may begin to mirror the liquidity of the Fund’s underlying portfolio holdings, which can be significantly less liquid than Shares.
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Large-Capitalization Investing. The Fund’s performance may be adversely affected if securities of large cap companies underperform securities of smaller-capitalization companies or the market as a whole. The securities of large cap companies may be relatively mature compared to smaller companies and therefore subject to slower growth during times of economic expansion. Large-capitalization companies may also be unable to respond quickly to new competitive challenges, such as changes in technology and consumer tastes.
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Market Risk. The trading prices of equity securities and other instruments fluctuate in response to a variety of factors. The Fund’s NAV and market price may fluctuate significantly in response to these and other factors. As a result, an investor could lose money over short or long periods of time.
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Mid-Capitalization Investing. The Fund may invest in the securities of mid-capitalization companies. As a result, the Fund’s performance may be adversely affected if securities of mid-capitalization companies underperform securities of other capitalization ranges or the market as a whole. Securities of smaller companies are often more vulnerable to market volatility than securities of larger companies.
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Passive Investment Risk. The Fund invests in the securities included in, or representative of, the Index regardless of their investment merit. The Fund does not attempt to outperform its Index or take defensive positions in declining markets. As a result, the Fund’s performance may be adversely affected by a general decline in the market segments relating to its Index.
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Portfolio Turnover Risk. The Fund may trade all or a significant portion of the securities in its portfolio in connection with each rebalance and reconstitution of its Index. A high portfolio turnover rate increases transaction costs, which may increase the Fund’s expenses. Frequent trading may also cause adverse tax consequences for investors in the Fund due to an increase in short-term capital gains.
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Sector Risk. To the extent the Fund invests more heavily in particular sectors of the economy, its performance will be especially sensitive to developments that significantly affect those sectors. The Fund may invest a significant portion of its assets in the following sectors and, therefore, the performance of the Fund could be negatively impacted by events affecting each of these sectors.
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Consumer Discretionary Sector Risk. The success of consumer product manufacturers and retailers is tied closely to the performance of domestic and international economies, interest rates, exchange rates, competition, consumer confidence, changes in demographics and consumer preferences. Companies in the consumer discretionary sector depend heavily on disposable household income and consumer spending, and may be strongly affected by social trends and marketing campaigns. These companies may be subject to severe competition, which may have an adverse impact on their profitability.
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Financial Sector Risk. This sector can be significantly affected by changes in interest rates, government regulation, the rate of defaults on corporate, consumer and government debt, the availability and cost of capital, and fallout from the housing and sub-prime mortgage crisis. Insurance companies, in particular, may be significantly affected by changes in interest rates, catastrophic events, price and market competition, the imposition of premium rate caps, or other changes in government regulation or tax law and/or rate regulation, which may have an adverse impact on their profitability. This sector has experienced significant losses in the recent past, and the impact of more stringent capital requirements and of recent or future regulation on any individual financial company or on the sector as a whole cannot be predicted. In recent years, cyber attacks and technology malfunctions and failures have become increasingly frequent in this sector and have caused significant losses.
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Health Care Sector Risk. Companies in the health care sector are subject to extensive government regulation and their profitability can be significantly affected by restrictions on government reimbursement for medical expenses, rising costs of medical products and services, pricing pressure (including price discounting), limited product lines, an increased emphasis on the delivery of healthcare through outpatient services, loss or impairment of intellectual property rights and litigation regarding product or service liability.
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Industrial Sector Risk. The industrial sector can be significantly affected by, among other things, worldwide economic growth, supply and demand for specific products and services, rapid technological developments, international political and economic developments, environmental issues, and tax and governmental regulatory policies. As the demand for, or prices of, industrials increase, the value of the Fund’s investments generally would be expected to also increase. Conversely, declines in the demand for, or prices of, industrials generally would be expected to contribute to declines in the value of such securities. Such declines may occur quickly and without warning and may negatively impact the value of the Fund and your investment.
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Information Technology Sector Risk. Market or economic factors impacting information technology companies and companies that rely heavily on technological advances could have a significant effect on the value of the Fund’s investments. The value of stocks of information technology companies and companies that rely heavily on technology is particularly vulnerable to rapid changes in technology product cycles, rapid product obsolescence, government regulation and competition, both domestically and internationally, including competition from foreign competitors with lower production costs. Stocks of information technology companies and companies that rely heavily on technology, especially those of smaller, less-seasoned companies, tend to be more volatile than the overall market. Information technology companies are heavily dependent on patent and intellectual property rights, the loss or impairment of which may adversely affect profitability.
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Small-Capitalization Investing. The Fund may invest in the securities of small-capitalization companies. As a result, the Fund may be more volatile than funds that invest in larger, more established companies. The securities of small-capitalization companies generally trade in lower volumes and are subject to greater and more unpredictable price changes than larger capitalization stocks or the stock market as a whole. Small-capitalization companies may be particularly sensitive to changes in interest rates, government regulation, borrowing costs and earnings.
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Tracking Error Risk. As with all index funds, the performance of the Fund and its Index may differ from each other for a variety of reasons. For example, the Fund incurs operating expenses and portfolio transaction costs not incurred by the Index. In addition, the Fund may not be fully invested in the securities of the Index at all times or may hold securities not included in the Index.
Risk Lose Money [Text] rr_RiskLoseMoney As with any investment, there is a risk that you could lose all or a portion of your investment in the Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following performance information indicates some of the risks of investing in the Fund. The bar chart shows the Fund’s performance for calendar years ended December 31. The table illustrates how the Fund’s average annual returns for the 1-year and since inception periods compare with those of a broad measure of market performance and the indexes tracked by the Fund during the applicable period. The Fund’s past performance, before and after taxes, does not necessarily indicate how it will perform in the future.Updated performance information is available on the Fund’s website at www.videntfunds.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information indicates some of the risks of investing in the Fund.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.videntfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance, before and after taxes, does not necessarily indicate how it will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
For the year-to-date period ended September 30, 2019, the Fund’s total return was 11.40%.
During the period of time shown in the bar chart, the Fund’s highest quarterly return was 8.86% for the quarter ended December 31, 2016, and the lowest quarterly return was -18.02% for the quarter ended December 31, 2018.
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date period ended
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2019
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 11.40%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2016
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 8.86%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (18.02%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns For the Periods Ended December 31, 2018
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates during the period covered by the table above and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Shares through tax-deferred arrangements such as an individual retirement account (“IRA”) or other tax-advantaged accounts.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher In certain cases, the figure representing “Return After Taxes on Distributions and Sale of Shares” may be higher than the other return figures for the same period. A higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates during the period covered by the table above and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Shares through tax-deferred arrangements such as an individual retirement account (“IRA”) or other tax-advantaged accounts. In certain cases, the figure representing “Return After Taxes on Distributions and Sale of Shares” may be higher than the other return figures for the same period. A higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.
Vident Core U.S. Equity Fund | Vident Core U.S. Stock Index/Vident Core U.S. Equity Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Vident Core U.S. Stock Index/Vident Core U.S. Equity Index (reflects no deduction for fees, expenses, or taxes) [3]
1 Year rr_AverageAnnualReturnYear01 (14.75%) [3]
Since Inception rr_AverageAnnualReturnSinceInception 3.69% [3]
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 21, 2014 [3]
Vident Core U.S. Equity Fund | Morningstar US Market Total Return Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Morningstar US Market Total Return Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 (5.05%)
Since Inception rr_AverageAnnualReturnSinceInception 8.15%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 21, 2014
Vident Core U.S. Equity Fund | S&P 500 Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel S&P 500 Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 (4.38%)
Since Inception rr_AverageAnnualReturnSinceInception 8.64%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 21, 2014
Vident Core U.S. Equity Fund | Vident Core U.S. Equity Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol VUSE
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.50%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets none
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.50%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 51
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 160
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 280
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 628
Annual Return 2015 rr_AnnualReturn2015 (6.06%)
Annual Return 2016 rr_AnnualReturn2016 18.71%
Annual Return 2017 rr_AnnualReturn2017 16.44%
Annual Return 2018 rr_AnnualReturn2018 (14.75%)
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (14.75%)
Since Inception rr_AverageAnnualReturnSinceInception 3.81%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 21, 2014
Vident Core U.S. Equity Fund | Vident Core U.S. Equity Fund | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 (15.03%)
Since Inception rr_AverageAnnualReturnSinceInception 3.46%
Vident Core U.S. Equity Fund | Vident Core U.S. Equity Fund | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Shares
1 Year rr_AverageAnnualReturnYear01 (8.49%)
Since Inception rr_AverageAnnualReturnSinceInception 2.95%
Vident International Equity Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Vident International Equity Fund®
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Vident International Equity Fund (the “Fund” or “International Equity Fund”) seeks to track the performance, before fees and expenses, of the Vident Core International Equity Index™ (the “Index” or the “International Equity Index”).
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The following table describes the fees and expenses you may pay if you buy, hold, and sell shares of the Fund (“Shares”). This table and the Example below do not include the brokerage commissions that investors may pay on their purchases and sales of Shares.
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund’s performance. For the fiscal year ended August 31, 2019, the Fund’s portfolio turnover rate was 76% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 76.00%
Expense Exchange Traded Fund Commissions [Text] rr_ExpenseExchangeTradedFundCommissions This table and the Example below do not include the brokerage commissions that investors may pay on their purchases and sales of Shares.
Expense Example [Heading] rr_ExpenseExampleHeading Expense Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your Shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies of the Fund
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund employs a “passive management” – or indexing – investment approach designed to track the performance of the Index.
The Vident Core International Equity Index™
The Index is a rules-based, systematic strategy index comprised of equity securities of issuers in developed and emerging markets outside of the United States. The strategy seeks to provide a systematic and optimized investment process that addresses the risks and opportunities of allocating capital in and among international equities.
Country Allocation
Index construction begins by identifying a universe of countries that are deemed to represent the bulk of investable and reliable stock opportunities in the largest and most liquid developed and emerging markets countries located outside of the United States. The Index determines a country’s investability based on factors including the country’s liquidity, accessibility to foreign investors, opportunities for efficient transactions, and capital controls. The Index determines a country’s reliability based on factors including governance, regulatory oversight, market operational efficiency, legal protections for minority and foreign investors and institutional stability. While the number of countries represented in the Index may change from time to time (e.g., at Index reconstitution or rebalance), the number of countries represented in the Index is expected to generally be between 25 and 40.
Each country within the investable universe is assigned a Country Principles Score (“CPS”), which is calculated utilizing a proprietary scoring methodology that seeks to weigh the relative resilience of a country to economic and financial shocks and the relative attractiveness of its investment opportunities. A country’s resilience reflects the capacity of a country’s equity markets to absorb and recover from economic and financial shocks and is measured based on a variety of economic metrics related to its financial capital resources (e.g., the country’s deficit as a percentage of gross domestic product (“GDP”), physical capital resources (e.g., total investment as a percentage of GDP), human resources (e.g., productivity, GDP per capital), and institutional and organizational resources (i.e., measures of legal and corporate rights). A country’s investment opportunity is measured based on short- and long-term changes in the country’s business and regulatory environment and equity market valuations. Allocation across countries is based on an optimization model that seeks to maximize the Index’s overall CPS while ensuring the Index portfolio is liquid, well diversified across countries and regions, and transaction cost and turnover efficient.
Stock Selection
The Index employs a multi-factor model for scoring and ranking stocks listed on a securities exchange within each country in the Index universe. The model combines 20 factors into three distinct factor composites, each seeking to score different stock attributes:
Component
Examples
Weight
 
 
 
Valuation
Price-to-book ratio, cash flow to enterprise value
50%
Quality
Gross profitability, return on invested capital, margin expansion, leverage, debt & equity issuance
30%
Momentum
Total return for past six months
20%
 
 
 
Stocks are excluded from the Index universe if (i) they trade primarily in China, (ii) the stock’s issuer is domiciled in Russia or India and does not have a depositary receipt that meets the Index’s liquidity guidelines, (iii) the stock’s issuer has a market capitalization of less than US$1 billion (US$800 million for stocks already in the Index), or (iv) the stock does not meet certain minimum liquidity requirements.
At the time of each reconstitution, the optimization model weights the remaining stocks to maximize the attractive factor attributes of the stocks subject to the following constraints: (i) a maximum allocation of 0.5% for any individual stock, (ii) certain liquidity thresholds, (iii) a maximum allocation of 7.5% for any individual country, and (iv) sector allocations constrained to remain close to their sector weights in a traditional market capitalization weighted index.
All rules are systematized and rely on data available at the end of each rebalancing period. The Index is reconstituted and rebalanced semi-annually in January and July. As of December 13, 2019, the Index was comprised of 242 component securities.
The Index was created on December 31, 2014 by Vident Financial, LLC, the Index Provider, for use by the Fund.
The Fund’s Investment Strategy
The Fund attempts to invest all, or substantially all, of its assets in the common stocks that make up the Index. The Fund expects to use a “replication” strategy to achieve its investment objective, meaning it will invest in all of the component securities of the Index, but may, when the sub-adviser believes it is in the best interests of the Fund, use a “representative sampling” strategy, meaning it may invest in a sample of the securities in the Index whose risk, return and other characteristics closely resemble the risk, return and other characteristics of the Index as a whole.
Under normal circumstances, at least 80% of the Fund’s total assets (exclusive of collateral held from securities lending) will be invested in the component securities of the Index and depositary receipts representing such component securities. Vident Advisory, LLC (“Vident Advisory” or the “Adviser”), the Fund’s investment adviser, expects that, over time, the correlation between the Fund’s performance and that of the Index, before fees and expenses, will be 95% or better.
To the extent the Index concentrates (i.e., holds more than 25% of its total assets) in the securities of a particular industry or group of related industries, the Fund will concentrate its investments to approximately the same extent as the Index.
Risk [Heading] rr_RiskHeading Principal Risks of Investing in the Fund
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
The principal risks of investing in the Fund are summarized below. The principal risks are presented in alphabetical order to facilitate finding particular risks and comparing them with other funds. Each risk summarized below is considered a “principal risk” of investing in the Fund, regardless of the order in which it appears. As with any investment, there is a risk that you could lose all or a portion of your investment in the Fund. Some or all of these risks may adversely affect the Fund’s net asset value per share (“NAV”), trading price, yield, total return and/or ability to meet its objectives. For more information about the risks of investing in the Fund, see the section in the Fund’s Prospectus titled “Additional Information About the Funds.”
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Capital Controls and Sanctions Risk. Economic conditions, such as volatile currency exchange rates and interest rates, political events, military action and other conditions may, without prior warning, lead to foreign government intervention (including intervention by the U.S. government with respect to foreign governments, economic sectors, foreign companies and related securities and interests) and the imposition of capital controls and/or sanctions, which may also include retaliatory actions of one government against another government, such as seizure of assets. Capital controls and/or sanctions include the prohibition of, or restrictions on, the ability to transfer currency, securities or other assets. Capital controls and/or sanctions may also impact the ability of the Fund to buy, sell or otherwise transfer securities or currency, negatively impact the value and/or liquidity of such instruments, adversely affect the trading market and price for Shares, and cause the Fund to decline in value.
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Currency Exchange Rate Risk. The Fund may invest a relatively large percentage of its assets in investments denominated in non-U.S. currencies or in securities that provide exposure to such currencies. Changes in currency exchange rates and the relative value of non-U.S. currencies will affect the value of the Fund’s investment and the value of your Shares. Currency exchange rates can be very volatile and can change quickly and unpredictably. As a result, the value of an investment in the Fund may change quickly and without warning and you may lose money.
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Emerging Markets Risk. The Fund may invest in companies organized in emerging market nations. Investments in securities and instruments traded in developing or emerging markets, or that provide exposure to such securities or markets, can involve additional risks relating to political, economic, or regulatory conditions not associated with investments in U.S. securities and instruments or investments in more developed international markets. Such conditions may impact the ability of the Fund to buy, sell or otherwise transfer securities, adversely affect the trading market and price for Shares and cause the Fund to decline in value.
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Equity Market Risk. The equity securities held in the Fund’s portfolio may experience sudden, unpredictable drops in value or long periods of decline in value. This may occur because of factors that affect securities markets generally or factors affecting specific issuers, industries, or sectors in which the Fund invests. Common stocks are generally exposed to greater risk than other types of securities, such as preferred stock and debt obligations, because common stockholders generally have inferior rights to receive payment from issuers.
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ETF Risks. The Fund is an ETF, and, as a result of an ETF’s structure, it is exposed to the following risks:
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Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants (“APs”). In addition, there may be a limited number of market makers and/or liquidity providers in the marketplace. To the extent either of the following events occur, Shares may trade at a material discount to NAV and possibly face delisting: (i) APs exit the business or otherwise become unable to process creation and/or redemption orders and no other APs step forward to perform these services, or (ii) market makers and/or liquidity providers exit the business or significantly reduce their business activities and no other entities step forward to perform their functions.
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Costs of Buying or Selling Shares. Due to the costs of buying or selling Shares, including brokerage commissions imposed by brokers and bid/ask spreads, frequent trading of Shares may significantly reduce investment results and an investment in Shares may not be advisable for investors who anticipate regularly making small investments.
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Shares May Trade at Prices Other Than NAV. As with all ETFs, Shares may be bought and sold in the secondary market at market prices. Although it is expected that the market price of Shares will approximate the Fund’s NAV, there may be times when the market price of Shares is more than the NAV intra-day (premium) or less than the NAV intra-day (discount) due to supply and demand of Shares or during periods of market volatility. This risk is heightened in times of market volatility, periods of steep market declines, and periods when there is limited trading activity for Shares in the secondary market, in which case such premiums or discounts may be significant.
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Trading. Although Shares are listed for trading on NYSE Arca, Inc. (the “Exchange”) and may be traded on U.S. exchanges other than the Exchange, there can be no assurance that Shares will trade with any volume, or at all, on any stock exchange. In stressed market conditions, the liquidity of Shares may begin to mirror the liquidity of the Fund’s underlying portfolio holdings, which can be significantly less liquid than Shares.
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Foreign Securities Risk. Investments in non-U.S. securities involve certain risks that may not be present with investments in U.S. securities. For example, investments in non-U.S. securities may be subject to risk of loss due to foreign currency fluctuations or to political or economic instability. Investments in non-U.S. securities also may be subject to withholding or other taxes and may be subject to additional trading, settlement, custodial, and operational risks. These and other factors can make investments in the Fund more volatile and potentially less liquid than other types of investments.
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Geographic Investment Risk. To the extent the Fund invests a significant portion of its assets in the securities of companies of a single country or region, it is more likely to be impacted by events or conditions affecting that country or region.
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Geopolitical Risk. Some countries and regions in which the Fund invests have experienced security concerns, war or threats of war and aggression, terrorism, economic uncertainty, natural and environmental disasters and/or systemic market dislocations that have led, and in the future may lead, to increased short-term market volatility and may have adverse long-term effects on the U.S. and world economies and markets generally, each of which may negatively impact the Fund’s investments.
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Large-Capitalization Investing. The Fund’s performance may be adversely affected if securities of large cap companies underperform securities of smaller-capitalization companies or the market as a whole. The securities of large cap companies may be relatively mature compared to smaller companies and therefore subject to slower growth during times of economic expansion. Large-capitalization companies may also be unable to respond quickly to new competitive challenges, such as changes in technology and consumer tastes.
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Market Risk. The trading prices of equity securities and other instruments fluctuate in response to a variety of factors. The Fund’s NAV and market price may fluctuate significantly in response to these and other factors. As a result, an investor could lose money over short or long periods of time.
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Mid-Capitalization Investing. The Fund may invest in the securities of mid-capitalization companies. As a result, the Fund’s performance may be adversely affected if securities of mid-capitalization companies underperform securities of other capitalization ranges or the market as a whole. Securities of smaller companies are often more vulnerable to market volatility than securities of larger companies.
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Passive Investment Risk. The Fund invests in the securities included in, or representative of, the Index regardless of their investment merit. The Fund does not attempt to outperform its Index or take defensive positions in declining markets. As a result, the Fund’s performance may be adversely affected by a general decline in the market segments relating to its Index.
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Portfolio Turnover Risk. The Fund may trade all or a significant portion of the securities in its portfolio in connection with each rebalance and reconstitution of its Index. A high portfolio turnover rate increases transaction costs, which may increase the Fund’s expenses. Frequent trading may also cause adverse tax consequences for investors in the Fund due to an increase in short-term capital gains.
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Sector Risk. To the extent the Fund invests more heavily in particular sectors of the economy, its performance will be especially sensitive to developments that significantly affect those sectors. The Fund may invest a significant portion of its assets in the following sectors and, therefore, the performance of the Fund could be negatively impacted by events affecting each of these sectors.
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Consumer Discretionary Sector Risk. The success of consumer product manufacturers and retailers is tied closely to the performance of domestic and international economies, interest rates, exchange rates, competition, consumer confidence, changes in demographics and consumer preferences. Companies in the consumer discretionary sector depend heavily on disposable household income and consumer spending, and may be strongly affected by social trends and marketing campaigns. These companies may be subject to severe competition, which may have an adverse impact on their profitability.
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Financial Sector Risk. This sector can be significantly affected by changes in interest rates, government regulation, the rate of defaults on corporate, consumer and government debt, the availability and cost of capital, and fallout from the housing and sub-prime mortgage crisis. Insurance companies, in particular, may be significantly affected by changes in interest rates, catastrophic events, price and market competition, the imposition of premium rate caps, or other changes in government regulation or tax law and/or rate regulation, which may have an adverse impact on their profitability. This sector has experienced significant losses in the recent past, and the impact of more stringent capital requirements and of recent or future regulation on any individual financial company or on the sector as a whole cannot be predicted. In recent years, cyber attacks and technology malfunctions and failures have become increasingly frequent in this sector and have caused significant losses.
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Industrial Sector Risk. The industrial sector can be significantly affected by, among other things, worldwide economic growth, supply and demand for specific products and services, rapid technological developments, international political and economic developments, environmental issues, and tax and governmental regulatory policies.
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Information Technology Sector Risk. Market or economic factors impacting information technology companies and companies that rely heavily on technological advances could have a significant effect on the value of the Fund’s investments. The value of stocks of information technology companies and companies that rely heavily on technology is particularly vulnerable to rapid changes in technology product cycles, rapid product obsolescence, government regulation and competition, both domestically and internationally, including competition from foreign competitors with lower production costs. Stocks of information technology companies and companies that rely heavily on technology, especially those of smaller, less-seasoned companies, tend to be more volatile than the overall market. Information technology companies are heavily dependent on patent and intellectual property rights, the loss or impairment of which may adversely affect profitability.
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Small-Capitalization Investing. The Fund may invest in the securities of small-capitalization companies. As a result, the Fund may be more volatile than funds that invest in larger, more established companies. The securities of small-capitalization companies generally trade in lower volumes and are subject to greater and more unpredictable price changes than larger capitalization stocks or the stock market as a whole. Small-capitalization companies may be particularly sensitive to changes in interest rates, government regulation, borrowing costs and earnings.
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Tracking Error Risk. As with all index funds, the performance of the Fund and its Index may differ from each other for a variety of reasons. For example, the Fund incurs operating expenses and portfolio transaction costs not incurred by the Index. In addition, the Fund may not be fully invested in the securities of the Index at all times or may hold securities not included in the Index.
Risk Lose Money [Text] rr_RiskLoseMoney As with any investment, there is a risk that you could lose all or a portion of your investment in the Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following performance information indicates some of the risks of investing in the Fund. The bar chart shows the Fund’s performance for calendar years ended December 31. The table illustrates how the Fund’s average annual returns for the 1-year, 5-year, and since inception periods compare with those of a broad measure of market performance and the indexes tracked by the Fund during the applicable period. The Fund’s past performance, before and after taxes, does not necessarily indicate how it will perform in the future. Updated performance information is available on the Fund’s website at www.videntfunds.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information indicates some of the risks of investing in the Fund.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.videntfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance, before and after taxes, does not necessarily indicate how it will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
For the year-to-date period ended September 30, 2019, the Fund’s total return was 5.35%.
During the period of time shown in the bar chart, the Fund’s highest quarterly return was 10.71% for the quarter ended March 31, 2017, and the lowest quarterly return was -13.57% for the quarter ended September 30, 2015
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date period ended
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2019
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 5.35%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2017
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 10.71%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2015
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (13.57%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns For the Periods Ended December 31, 2018
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses, or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the historical highest individual federal marginal income tax rates during the period covered by the table above and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Shares through tax-deferred arrangements such as an individual retirement account (“IRA”) or other tax-advantaged accounts.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher In certain cases, the figure representing “Return After Taxes on Distributions and Sale of Shares” may be higher than the other return figures for the same period. A higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates during the period covered by the table above and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Shares through tax-deferred arrangements such as an individual retirement account (“IRA”) or other tax-advantaged accounts. In certain cases, the figure representing “Return After Taxes on Distributions and Sale of Shares” may be higher than the other return figures for the same period. A higher after-tax return results when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.
Vident International Equity Fund | Vident Core International Equity Index/Vident International Equity Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Vident Core International Equity Index/Vident International Equity Index (reflects no deduction for fees, expenses, or taxes) [4]
1 Year rr_AverageAnnualReturnYear01 (16.97%) [4]
5 Years rr_AverageAnnualReturnYear05 1.69% [4]
Since Inception rr_AverageAnnualReturnSinceInception 1.16% [4]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 29, 2013 [4]
Vident International Equity Fund | Morningstar Global ex-US Large-Mid Total Return Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Morningstar Global Markets ex-US Large-Mid Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 (13.87%)
5 Years rr_AverageAnnualReturnYear05 0.95%
Since Inception rr_AverageAnnualReturnSinceInception 1.04%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 29, 2013
Vident International Equity Fund | Morningstar Global Markets ex-US Index (reflects no deduction for fees, expenses or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Morningstar Global Markets ex-US Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 (14.17%)
5 Years rr_AverageAnnualReturnYear05 1.37%
Since Inception rr_AverageAnnualReturnSinceInception 1.46%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 29, 2013
Vident International Equity Fund | Vident International Equity Fund  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol VIDI
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.61%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets none
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.61%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 62
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 195
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 340
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 762
Annual Return 2014 rr_AnnualReturn2014 (2.16%)
Annual Return 2015 rr_AnnualReturn2015 (10.78%)
Annual Return 2016 rr_AnnualReturn2016 8.53%
Annual Return 2017 rr_AnnualReturn2017 32.87%
Annual Return 2018 rr_AnnualReturn2018 (17.32%)
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (17.32%)
5 Years rr_AverageAnnualReturnYear05 0.80%
Since Inception rr_AverageAnnualReturnSinceInception 0.27%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 29, 2013
Vident International Equity Fund | Vident International Equity Fund | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 (17.58%)
5 Years rr_AverageAnnualReturnYear05 0.51%
Since Inception rr_AverageAnnualReturnSinceInception (0.01%)
Vident International Equity Fund | Vident International Equity Fund | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Shares
1 Year rr_AverageAnnualReturnYear01 (9.60%)
5 Years rr_AverageAnnualReturnYear05 0.86%
Since Inception rr_AverageAnnualReturnSinceInception 0.45%
[1] Effective January 6, 2016, the Fund’s investment objective changed to track the performance, before fees and expenses, of the Vident Core U.S. Bond Index. Prior to January 6, 2016, the Fund’s investment objective was to track the price and total return performance, before fees and expenses, of the Vident Core U.S. Bond Strategy Index. Performance shown for periods prior to January 6, 2016 is that of the Vident Core U.S. Bond Strategy Index.
[2] Total Annual Fund Operating Expenses do not correlate to the ratio of expenses to average net assets provided in the Financial Highlights section of the Prospectus, which reflects only the operating expenses of the Fund and does not include acquired fund fees and expenses.
[3] Effective January 6, 2016, the Fund’s investment objective changed to track the performance, before fees and expenses, of the Vident Core U.S. Stock Index. Prior to January 6, 2016, the Fund’s investment objective was to track the price and total return performance, before fees and expenses, of the Vident Core U.S. Equity Index. Performance shown for periods prior to January 6, 2016 is that of the Vident Core U.S. Equity Index.
[4] Effective January 6, 2016, the Fund’s investment objective changed to track the performance, before fees and expenses, of the Vident Core International Equity Index. Prior to January 6, 2016, the Fund’s investment objective was to track the price and total return performance, before fees and expenses, of the Vident International Equity Index. Performance shown for periods prior to January 6, 2016 is that of the Vident International Equity Index.