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Optica Rare Earths & Critical Materials ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading Optica Rare Earths & Critical Materials ETF
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Optica Rare Earths & Critical Materials ETF (the “Fund”) seeks to provide investment results that, before fees and expenses, correspond generally to the total return performance of the EQM Rare Earths & Critical Materials Index (the “Index”).
Expense [Heading] rr_ExpenseHeading Fees and Expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and Example below.
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 of the Fund are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example above, affect the Fund’s performance. This rate excludes the value of portfolio securities received or delivered as a result of in-kind creations or redemptions of the Fund’s shares. Because the Fund is new, portfolio turnover information is not yet available.
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates Based on estimated amounts for the current fiscal year.
Expense Example [Heading] rr_ExpenseExampleHeading 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 sell 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. Although your actual costs may be higher or lower, based on these assumptions your cost would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Fund invests in securities comprising the Index. The Index is comprised of companies that (i) generate at least 50% of their revenue from rare earths or critical metal mining, production, recycling, processing and/or refining or (ii) engage in projects that have the potential, when developed, to generate 50% of revenue from rare earths or critical metal mining, production, recycling, processing and/or refining (“Rare Earths and Critical Materials Companies”). Rare earths and critical materials are those identified by either: (A) the U.S. Government as: (i) a non-fuel mineral or mineral material essential to the economic and national security of the United States, (ii) the supply chain of which is vulnerable to disruption, and (iii) that serves an essential function in the manufacturing of a product, the absence of which would have significant consequences for the U.S. economy or national security; or (B) Australia, Canada, Japan or the European Union as meeting similar criteria. There are a range of minerals or mineral material groups deemed critical under these criteria. Under normal circumstances, the Fund will invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in securities of Rare Earths and Critical Materials Companies.

 

The universe of eligible index components are exchange-listed equity securities of Rare Earths and Critical Materials Companies, including depositary receipts. Such companies are identified through the use of a proprietary selection methodology that includes a review of financial ratios, sell side research, and fundamental research. To be included in the Index, the minimum market capitalization of such companies must be at least $250 million with an average daily traded value over the most recent six months of at least $500 thousand. As of March 11, 2022, the Index comprised 51 component securities.

 

The Index consists of securities of issuers from around the world, including emerging markets countries. There is no limitation on the amount of foreign or emerging market securities that may be included in the Index.

 

The Index is reconstituted and rebalanced on a semi-annual basis in February and August. At that time, constituents are weighted by market capitalization with a maximum individual constituent weight of 10%. Deletions from the Index may be made at any time due to changes in business, mergers, acquisitions, bankruptcies, suspensions, de-listings and spin-offs. The Index is unmanaged and cannot be invested in directly.

 

The Fund employs a “passive management” investment strategy designed to track the performance of the Index. Exchange Traded Concepts, LLC (the “Adviser”) generally will use a replication methodology, meaning it will invest in all of the securities comprising the Index in proportion to their respective weightings in the Index. However, the Adviser may utilize a sampling methodology under various circumstances, including when it may not be possible or practicable to purchase all of the securities in the Index. The Adviser expects that over time, if the Fund has sufficient assets, the correlation between the Fund’s performance, before fees and expenses, and that of the Index will be 95% or better. A figure of 100% would indicate perfect correlation.

 

The Fund may invest up to 20% of its net assets in investments that are not included in the Index, but that the Adviser believes will help the Fund track the performance of the Index.

 

The Fund will concentrate its investments (i.e., invest more than 25% of its total assets) in a particular industry or group of industries to approximately the same extent that the Index concentrates in an industry or group of industries. As of March 11, 2022, the Index was concentrated in the Metals & Mining Industry as defined by the Global Industry Classification Standard (“GICS”). In addition, in replicating the Index, the Fund may from time to time invest a significant portion of its assets in the securities of companies in one or more sectors. As of March 11, 2022, a significant portion of the Index consisted of companies in the Materials Sector, as defined by GICS.

 

The Fund is classified as a “non-diversified” investment company under the Investment Company Act of 1940 (the “1940 Act”) and, therefore, may invest a greater percentage of its assets in a particular issuer than a diversified fund.

 

Optica Capital Pty Ltd. (the “Index Provider”), in consultation with EQM Indexes, LLC (the “Index Administrator”), developed the methodology for determining the securities to be included in the Index. The Index Administrator maintains the Index and is responsible for implementing the semi-annual rebalance and reconstitution and monitoring and implementing any adjustments, additions and deletions to the Index based on the index methodology and certain corporate actions, such as initial public offerings, mergers, acquisitions, bankruptcies, suspensions, de-listings, tender offers and spin-offs. The Index is calculated and published by Solactive AG. Neither the Index Provider, Index Administrator, or Solactive AG is affiliated with each other or with the Fund or the Adviser.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal circumstances, the Fund will invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in securities of Rare Earths and Critical Materials Companies.The Fund will concentrate its investments (i.e., invest more than 25% of its total assets) in a particular industry or group of industries to approximately the same extent that the Index concentrates in an industry or group of industries. As of March 11, 2022, the Index was concentrated in the Metals & Mining Industry as defined by the Global Industry Classification Standard (“GICS”). In addition, in replicating the Index, the Fund may from time to time invest a significant portion of its assets in the securities of companies in one or more sectors. As of March 11, 2022, a significant portion of the Index consisted of companies in the Materials Sector, as defined by GICS.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

As with all funds, a shareholder is subject to the risk that his or her investment could lose money. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the FDIC or any government agency. The principal risks affecting shareholders’ investments in the Fund are set forth below.

 

Common Stock Risk. Common stock holds the lowest priority in the capital structure of a company, and therefore takes the largest share of the company’s risk and its accompanying volatility. The value of the common stock held by the Fund may fall due to general market and economic conditions, perceptions regarding the industries in which the issuers of securities held by the Fund participate, or facts relating to specific companies in which the Fund invests.

 

Currency Exchange Rate Risk. To the extent the Fund invests in securities denominated in non-U.S. 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. Because the Fund’s net asset value (“NAV”) is determined in U.S. dollars, the Fund’s NAV could decline if the currency of the non-U.S. market in which the Fund invests depreciates against the U.S. dollar, even if the value of the Fund’s holdings, measured in the foreign currency, increases. 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.

 

Depositary Receipt Risk. Depositary receipts such as American Depositary Receipts ("ADRs") and Global Depositary Receipts ("GDRs") are subject to the risks associated with investing directly in foreign securities. In addition, investments in depositary receipts may be less liquid than the underlying shares in their primary trading market.

 

Early Close/Trading Halt Risk. An exchange or market may close or issue trading halts on specific securities, or the ability to buy or sell certain securities or financial instruments may be restricted, which may result in the Fund being unable to buy or sell certain securities or financial instruments. In such circumstances, the Fund may be unable to rebalance its portfolio, may be unable to accurately price its investments and/or may incur substantial trading losses.

 

Emerging Markets Securities Risk. Emerging markets are subject to greater market volatility, lower trading volume, political and economic instability, uncertainty regarding the existence of trading markets and more governmental limitations on foreign investment than more developed markets. In addition, securities in emerging markets may be subject to greater price fluctuations than securities in more developed markets. Differences in regulatory, accounting, auditing, and financial reporting and recordkeeping standards could impede the Adviser’s ability to evaluate local companies and impact the Fund’s performance. Investments in securities of issuers in emerging markets may also be exposed to risks related to a lack of liquidity, greater potential for market manipulation, issuers’ limited reliable access to capital, and foreign investment structures. Additionally, the Fund may have limited rights and remedies available to it to pursue claims against issuers in emerging markets.

 

Equity Securities Risk. The prices of equity securities in which the Fund invests may rise and fall daily. These price movements may result from factors affecting individual issuers, industries or the stock market as a whole.

 

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 expropriation, nationalization or adverse political or economic developments. Foreign securities may have relatively low market liquidity and decreased publicly available information about issuers. 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. Non-U.S. issuers may also be subject to inconsistent and potentially less stringent accounting, auditing, financial reporting and investor protection standards than U.S. issuers. These and other factors can make investments in the Fund more volatile and potentially less liquid than other types of investments. In addition, where all or a portion of the Fund’s portfolio holdings trade in markets that are closed when the Fund’s market is open, there may be valuation differences that could lead to differences between the Fund’s market price and the value of the Fund’s portfolio holdings.

 

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.

 

Risks of Investing in China. The Fund invests a portion of its assets in securities of Chinese issuers through the Hong Kong stock exchange via ADRs. Consequently, the Fund’s performance is expected to be influenced by social, political, and economic conditions within China to the extent of the weighting of the securities in the Fund. The government of China maintains strict currency controls in order to achieve economic, trade and political objectives and regularly intervenes in the currency market. The Chinese government also plays a major role in the country’s economic policies regarding foreign investments. Foreign investors are subject to the risk of loss from expropriation or nationalization of their investment assets and property, governmental restrictions on foreign investments and the repatriation of capital invested. In addition, the rapid growth rate of the Chinese economy over the past several years may not continue, and the trend toward economic liberalization and disparities in wealth may result in social disorder, including violence and labor unrest. These and other factors could have a negative impact on the Fund’s performance and increase the volatility of an investment in the Fund to the extent of the weighting of the Chinese securities in the Fund.

 

Index Tracking Risk. The Fund’s return may not match or achieve a high degree of correlation with the return of the Index. To the extent the Fund utilizes a sampling approach, it may experience tracking error to a greater extent than if the Fund sought to replicate the Index.

 

Industry Concentration Risk. Because the Fund’s assets will be concentrated in an industry or group of industries to the extent the Index concentrates in a particular industry or group of industries, the Fund is subject to loss due to adverse occurrences that may affect that industry or group of industries. As of March 11, 2022, the Index was concentrated in the Metals & Mining Industry.

 

Metals & Mining Industry Risk. The Fund invests in securities that are issued by and/or have exposure to, companies primarily involved in the metals and mining industry. Investments in metals and mining companies may be speculative and subject to greater price volatility than investments in other types of companies. The profitability of companies in the metals and mining industry is related to, among other things, worldwide metal prices and extraction and production costs. Worldwide metal prices may fluctuate substantially over short periods of time, and as a result, the Fund’s NAV may be more volatile than other types of investments. In addition, metals and mining companies may be significantly affected by changes in global demand for certain metals, economic developments, energy conservation, the success of exploration projects, changes in exchange rates, interest rates, economic conditions, tax treatment, trade treaties, and government regulation and intervention, and events in the regions that the companies to which the Fund has exposure operate (e.g., expropriation, nationalization, confiscation of assets and property, the imposition of restrictions on non-U.S. investments or repatriation of capital, military coups, social or political unrest, violence and labor unrest). Metals and mining companies may also be subject to the effects of competitive pressures in the metals and mining industry.

 

Investing in Rare Earths and Critical Materials Companies Risk. The Fund will be sensitive to, and its performance will depend to a greater extent on, the overall condition of Rare Earths and Critical Materials Companies. Rare earths and critical materials are industrial metals that are typically mined as by-products or secondary metals in operations focused on precious metals and base metals. Compared to base metals, they have more specialized uses. Rare earth metals (or rare earth elements) are a collection of chemical elements that are crucial to many of the world’s most advanced technologies. Consequently, the demand for rare earths and critical materials has strained supply, which has the potential to result in a shortage of such materials which could adversely affect the companies in the Fund’s portfolio. Companies involved in the various activities that are related to the mining, production, recycling, processing and/or refining of rare earths and critical materials tend to be small-, medium- and micro-capitalization companies with volatile share prices, are highly dependent on the price of rare earths and critical materials, which may fluctuate substantially over short periods of time. The value of such companies may be significantly affected by events relating to international, national and local political and economic developments, energy conservation efforts, the success of exploration projects, commodity prices, tax and other government regulations, depletion of resources, and mandated expenditures for safety and pollution control devices. The mining, production, recycling, processing and/or refining of rare earths and critical metals can be capital intensive and, if companies involved in such activities are not managed well, the share prices of such companies could decline even as prices for the underlying rare earths and critical metals are rising. In addition, companies involved in the various activities that are related to the mining, production, recycling, processing and/or refining of rare earths and critical metals may be at risk for environmental damage claims.

 

Issuer-Specific Risk. Fund performance depends on the performance of the issuers to which the Fund has exposure. Issuer-specific events, including changes in the financial condition of an issuer, can have a negative impact on the value of the Fund.

 

Large-Capitalization Risk. Returns on investments in securities of large companies could trail the returns on investments in securities of smaller and mid-sized companies. The securities of large-capitalization companies may also 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.

 

Limited Authorized Participants, Market Makers and Liquidity Providers Risk. Because the Fund is an ETF, only a limited number of institutional investors (known as “Authorized Participants”) are authorized to purchase and redeem shares directly from the Fund. 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 occurs, the risk of which is higher during periods of market stress, shares of the Fund may trade at a material discount to NAV and possibly face delisting: (i) Authorized Participants exit the business or otherwise become unable to process creation and/or redemption orders and no other Authorized Participants 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.

 

Market Risk. The market price of a security or instrument could decline, sometimes rapidly or unpredictably, due to general market conditions that are not specifically related to a particular company, such as real or perceived adverse economic or political conditions throughout the world, changes in the general outlook for corporate earnings, changes in interest or currency rates or adverse investor sentiment generally. Local, regional, or global events such as war, acts of terrorism, the spread of infectious illness or other public health issues, recessions, or other events could have a significant impact on the market generally and on specific securities. The market value of a security may also decline because of factors that affect a particular industry or industries, such as labor shortages or increased production costs and competitive conditions within an industry.

 

Methodology Risk. The Fund seeks to track the performance of stocks of companies selected using a methodology developed by the Index Provider. No assurance can be given that companies selected according to the methodology will outperform stocks of other companies. Moreover, there is no guarantee that the methodology will generate or produce the intended results.

 

New/Smaller Fund Risk. A new or smaller fund is subject to the risk that its performance may not represent how the fund is expected to or may perform in the long term. In addition, new funds have limited operating histories for investors to evaluate and new and smaller funds may not attract sufficient assets to achieve investment and trading efficiencies. There can be no assurance that the Fund will achieve an economically viable size, in which case it could ultimately liquidate. The Fund may be liquidated by the Board of Trustees (the “Board”) without a shareholder vote. In a liquidation, shareholders of the Fund will receive an amount equal to the Fund’s NAV, after deducting the costs of liquidation, including the transaction costs of disposing of the Fund’s portfolio investments. Receipt of a liquidation distribution may have negative tax consequences for shareholders. Additionally, during the Fund’s liquidation all or a portion of the Fund’s portfolio may be invested in a manner not consistent with its investment objective and investment policies.

 

Non-Diversification Risk. The Fund is non-diversified under the 1940 Act, meaning that, as compared to a diversified fund, it can invest a greater percentage of its assets in securities issued by or representing a small number of issuers. As a result, the performance of these issuers can have a substantial impact on the Fund’s performance.

 

Operational Risk. The Fund and its service providers may experience disruptions that arise from human error, processing and communications errors, counterparty or third-party errors, technology or systems failures, any of which may have an adverse impact on the Fund.

 

Passive Investment Risk. The Fund is not actively managed and, therefore, the Fund would not sell a security due to current or projected underperformance of the security, industry, or sector unless that security is removed from the Index or selling the security is otherwise required upon a rebalancing of the Index.

 

Risk of Regulatory Action and Changes in Governments. The producing, refining and recycling of rare earths and critical materials may be significantly affected by regulatory action and changes in governments. Actions by countries essential to the producing, refining or recycling of rare earths and critical materials to limit exports could have a significant adverse effect on industries around the globe and on the values of the businesses in which the Fund invests.

 

Sector Focus Risk. The Fund may invest a significant portion of its assets in one or more sectors and thus will be more susceptible to the risks affecting those sectors. While the Fund’s sector exposure is expected to vary over time, the Fund anticipates that it may be subject to some or all of the risks described below. As of March 11, 2022, a significant portion of the Index consisted of companies in the Materials Sector. 

 

Materials Sector Risk. Companies in the materials sector may be adversely impacted by the volatility of commodity prices, changes in exchange rates, depletion of resources, over-production, litigation and changes in government regulations, among other factors.

 

Small- and Mid-Capitalization Risk. The small- and mid-capitalization companies in which the Fund invests may be more vulnerable to adverse business or economic events than larger, more established companies, and may underperform other segments of the market or the equity market as a whole. Securities of small- and mid-capitalization companies generally trade in lower volumes, are often more vulnerable to market volatility, and are subject to greater and more unpredictable price changes than larger capitalization stocks or the stock market as a whole.

 

Trading Risk. Shares of the Fund may trade on the NYSE Arca, Inc. (the “Exchange”) above (premium) or below (discount) their NAV. The NAV of shares of the Fund will fluctuate with changes in the market value of the Fund’s holdings. The market prices of the Fund’s shares will fluctuate continuously throughout trading hours based on market supply and demand and may deviate significantly from the value of the Fund’s holdings, particularly in times of market stress, with the result that investors may pay more or receive less than the underlying value of the Fund shares bought or sold. When buying or selling shares in the secondary market, you may incur costs attributable to the difference between the highest price a buyer is willing to pay to purchase shares of the Fund (bid) and the lowest price a seller is willing to accept for shares of the Fund (ask), which is known as the bid-ask spread. In addition, although the Fund’s shares are currently listed on the Exchange, there can be no assurance that an active trading market for shares will develop or be maintained. Trading in Fund shares may be halted due to market conditions or for reasons that, in the view of the Exchange, make trading in shares of the Fund inadvisable. In stressed market conditions, the market for the Fund’s shares may become less liquid in response to deteriorating liquidity in the markets for the Fund’s underlying portfolio holdings. In such a circumstance, the Fund’s shares could trade at a premium or discount to their NAV.
Risk Lose Money [Text] rr_RiskLoseMoney As with all funds, a shareholder is subject to the risk that his or her investment could lose money.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Fund is not a bank deposit and is not insured or guaranteed by the FDIC or any government agency.
Risk Nondiversified Status [Text] rr_RiskNondiversifiedStatus The Fund is non-diversified under the 1940 Act, meaning that, as compared to a diversified fund, it can invest a greater percentage of its assets in securities issued by or representing a small number of issuers. As a result, the performance of these issuers can have a substantial impact on the Fund’s performance.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The Fund is new and, therefore, has no performance history. Once the Fund has completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by comparing the Fund’s return to a broad measure of market performance.  
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess Once the Fund has completed a full calendar year of operations, a bar chart and table will be included that will provide some indication of the risks of investing in the Fund by comparing the Fund’s return to a broad measure of market performance.
Optica Rare Earths & Critical Materials ETF | Optica Rare Earths & Critical Materials ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Management Fee rr_ManagementFeesOverAssets 0.85%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets none [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.85%
1 Year rr_ExpenseExampleYear01 $ 87
3 Years rr_ExpenseExampleYear03 $ 271
[1] Based on estimated amounts for the current fiscal year.