rr_RiskReturnHeading

Summary Section ALPS EQUAL SECTOR WEIGHT ETF (THE "FUND")

rr_ObjectivePrimaryTextBlock

The Fund seeks investment results that replicate as closely as possible, before fees and expenses, the performance of the NYSE^® Equal Sector Weight Index (ticker symbol NYXLEW) (the "Underlying Index").

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund ("Shares"). Investors purchasing or selling Shares in the secondary market may be subject to fees and expenses (including customary brokerage commissions) charged by their broker. These fees and expenses are not included in the expense example below.

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

March 31, 2021

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. During the most recent fiscal year ended November 30, 2019, the Fund's portfolio turnover rate was 4% of the average value of its portfolio.

rr_ExpenseExchangeTradedFundCommissions

Investors purchasing or selling Shares in the secondary market may be subject to fees and expenses (including customary brokerage commissions) charged by their broker.

rr_ExpenseExampleNarrativeTextBlock

The following example is intended to help you compare the cost of investing in the Fund with the costs of investing in other funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then hold or redeem all of your Shares at the end of those periods. The example also assumes that your investment has a 5% return each year, that all dividends and capital gains are reinvested each year, and that the Fund's operating expenses remain the same each year.

Although your actual costs may be higher or lower, based on these assumptions your costs would be:

rr_StrategyNarrativeTextBlock

The Fund will seek investment results that replicate as closely as possible, before fees and expenses, the performance of the Underlying Index. The Underlying Index is an index of ETFs comprised of all active Select Sector SPDR^®ETFs in an equal weighted portfolio. These are the Communication Services Select Sector SPDR^® Fund, Consumer Discretionary Select Sector SPDR^® Fund, Consumer Staples Select Sector SPDR^® Fund, Materials Select Sector SPDR^® Fund, Energy Select Sector SPDR^® Fund, Technology Select Sector SPDR^® Fund, Utilities Select Sector SPDR^® Fund, Financial Select Sector SPDR^® Fund, Industrial Select Sector SPDR^® Fund, Health Care Select Sector SPDR^® Fund and Real Estate Select Sector SPDR^® Fund (each, an "Underlying Sector ETF" and collectively, the "Underlying Sector ETFs"). In order to track the Underlying Index, the Fund will use a "fund of funds" approach, and seek to achieve its investment objective by investing at least 90% of its total assets in the shares of the Underlying Sector ETFs. The Underlying Index is designed to track performance of the equally weighted Underlying Sector ETFs. Accordingly, the Underlying Index is rebalanced to an equal weighting quarterly during the months of March, June, September, and December.

Each Underlying Sector ETF is an "index fund" that invests in the equity securities of companies in a particular sector or group of industries. The objective of each Underlying Sector ETF is to track its respective underlying sector index by replicating the securities in the underlying sector index. Together, the ten Underlying Sector ETFs represent the Underlying Index as a whole.

rr_RiskNarrativeTextBlock

Investors should consider the following risk factors and special considerations associated with investing in the Fund, which may cause you to lose all or part of your money. See also the section "Risks of Underlying Sector ETFs" for additional information about the Fund's risk factors.

Investment Risk. An investment in the Fund is subject to investment risk including the possible loss of the entire principal amount that you invest.

Fund of Funds Risk. The Fund pursues its investment objective by investing its assets in the Underlying Sector ETFs rather than investing directly in stocks, bonds, cash or other investments. The Fund's investment performance depends on the investment performance of the Underlying Sector ETFs in which it invests. An investment in the Fund is subject to the risks associated with the Underlying Sector ETFs that comprise the Underlying Index.

Underlying Sector ETFs Risk. Investment in the Underlying Sector ETFs may subject the Fund to the following risks: Market Risk and Non-Correlation Risk. The Fund may also be subject to certain other risks specific to each Underlying Sector ETF.

Market Risk. The Fund's investment in an Underlying Sector ETF involves risks similar to those of investing in any fund of equity securities, such as market fluctuations caused by such factors as economic, political and social developments, inflation (or expectations for inflation), changes in interest rates and perceived trends in stock prices. The values of equity securities could decline generally or could underperform other investments.

Non-Correlation Risk. The Fund's return may not match the return of the Underlying Index for a number of reasons, including operating expenses incurred by the Fund not applicable to the Underlying Index, costs in buying and selling securities, asset valuation differences and differences between the Fund's portfolio and the Underlying Index resulting from legal restrictions, cash flows or operational inefficiencies.

Fluctuation of Net Asset Value. The net asset value ("NAV") of the Fund's Shares will generally fluctuate with changes in the market value of the Fund's holdings. The market prices of the Shares will generally fluctuate in accordance with changes in NAV as well as the relative supply of and demand for the Shares on the NYSE Arca, Inc. (the "NYSE Arca"). The Adviser cannot predict whether the Shares will trade below, at or above their NAV.

Performance Information Illustrates Variability of Returns [Text]

rr_BarChartAndPerformanceTableHeading

FUND PERFORMANCE

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart and table provide an indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for certain time periods compare with the average annual returns of the Underlying Index and of another benchmark of market performance.

rr_PerformanceAvailabilityWebSiteAddress

www.alpsfunds.com

rr_BarChartHeading

Annual Total Returns (calendar years ended 12/31)

rr_PerformanceTableHeading

Average Annual Total Returns For periods ended December 31, 2019

rr_PerformanceTableNotRelevantToTaxDeferred

After-tax returns are not relevant to investors who hold Shares of the Fund through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.

rr_ProspectusLineItems

Acquired Fund Fees and Expenses

rr_ManagementFeesOverAssets

0.37%

rr_AcquiredFundFeesAndExpensesOverAssets

0.13%

Fee Waiver and Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.19%)

^[1]

rr_ExpenseExampleYear01

$ 29

rr_ExpenseExampleYear05

244

Annual Return 2010

rr_AnnualReturn2010

15.67%

Annual Return 2012

rr_AnnualReturn2012

14.51%

rr_AnnualReturn2014

13.05%

rr_AnnualReturn2016

13.22%

rr_AnnualReturn2018

(6.01%)

rr_HighestQuarterlyReturnLabel

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

13.28%

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2011

rr_AverageAnnualReturnYear01

27.86%

rr_AverageAnnualReturnYear10

12.20%

rr_ProspectusLineItems

rr_AverageAnnualReturnYear05

8.93%

rr_AverageAnnualReturnYear01

16.88%

rr_AverageAnnualReturnYear10

10.06%

rr_ProspectusLineItems

rr_AverageAnnualReturnYear05

9.75%

^[2]

rr_AverageAnnualReturnYear01

31.49%

^[2]

rr_AverageAnnualReturnYear10

13.56%

^[2]

rr_ProspectusLineItems

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

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FEES AND EXPENSES OF THE FUND

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Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment):

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 Fund 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. During the Fund's most recent fiscal year ended November 30, 2019, the Fund's portfolio turnover rate was 34% of the average value of its portfolio.

rr_ExpenseExchangeTradedFundCommissions

Investors purchasing Shares in the secondary market may be subject to fees and expenses (including customary brokerage commissions) charged by their broker.

rr_ExpenseExampleNarrativeTextBlock

The following example is intended to help you compare the cost of investing in the Fund with the costs of investing in other funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then hold or redeem all of your Shares at the end of those periods. The example also assumes that your investment has a 5% return, that all dividends and capital gains are reinvested each year, and that the Fund's operating expenses remain the same each year.

Although your actual costs may be higher or lower based on these assumptions, your costs would be:

rr_StrategyNarrativeTextBlock

The Fund employs a "passive management" - or indexing - investment approach designed to track the performance of the Underlying Index. The Underlying Index is a rules based, modified capitalization weighted, float adjusted index intended to give investors a means of tracking the overall performance of the United States energy infrastructure Master Limited Partnership ("MLP") asset class. The Underlying Index was developed by Alerian, a leading provider of objective energy infrastructure and MLP benchmarks, data and analytics. The Underlying Index is comprised of energy infrastructure MLPs that earn a majority of their cash flow from the transportation, storage and processing of energy commodities. As of December 31, 2019, the U.S. dollar-denominated market capitalizations of the Index Components ranged from approximately $1.45 billion to approximately $61.46 billion.

The Fund will normally invest at least 90% of its total assets in securities that comprise the Underlying Index.

Energy infrastructure MLPs are publicly traded partnerships engaged in the transportation, storage and processing of minerals and natural resources. By confining their operations to these specific activities, their interests, or units, are able to trade on public securities exchanges exactly like the shares of a corporation, without entity level taxation.

To qualify as a MLP and not to be taxed as a corporation, a partnership must receive at least 90% of its income from qualifying sources as set forth in Section 7704(d) of the Internal Revenue Code of 1986, as amended (the "Code"). These qualifying sources include natural resource-based activities such as the processing, transportation and storage of mineral or natural resources. MLPs generally have two classes of owners, the general partner and limited partners. The general partner of an MLP is typically owned by a major energy company, an investment fund, the direct management of the MLP, or is an entity owned by one or more of such parties. The general partner may be structured as a private or publicly traded corporation or other entity. The general partner typically controls the operations and management of the MLP through an up to 2% equity interest in the MLP plus, in many cases, ownership of common units and subordinated units. Limited partners typically own the remainder of the partnership, through ownership of common units, and have a limited role in the partnership's operations and management.

MLPs are typically structured such that common units and general partner interests have first priority to receive quarterly cash distributions up to an established minimum amount ("minimum quarterly distributions" or "MQD"). Common and general partner interests also accrue arrearages in distributions to the extent the MQD is not paid. Once common and general partner interests have been paid, subordinated units receive distributions of up to the MQD; however, subordinated units do not accrue arrearages. Distributable cash in excess of the MQD is paid to both common and subordinated units and is distributed to both common and subordinated units generally on a pro rata basis. The general partner is also eligible to receive incentive distributions if the general partner operates the business in a manner which results in distributions paid per common unit surpassing specified target levels. As the general partner increases cash distributions to the limited partners, the general partner receives an increasingly higher percentage of the incremental cash distributions.

Unlike direct investments in MLPs, income and losses from the Fund's investments in MLPs will not directly flow through to the personal tax returns of shareholders. The Fund will report distributions from its investments, including MLPs, made to shareholders annually on Form 1099. Shareholders will not, solely by virtue of their status as Fund shareholders, be treated as engaged in the business conducted by the underlying MLPs for federal or state income tax purposes or for purposes of the tax on unrelated business income of tax-exempt organizations. Under recent tax legislation, individuals and certain other non-corporate investors will be entitled to a 20% deduction against taxable income allocated from direct investments in MLPs. Neither the Fund directly nor the Fund's shareholders indirectly will be entitled to this deduction with respect to the Fund's MLP investments.

Risk Nondiversified Status [Text]

rr_RiskNarrativeTextBlock

Investors should consider the following risk factors associated with investing in the Fund which may cause you to lose money.

Investment Risk. An investment in the Fund is subject to investment risk including the possible loss of the entire principal amount that you invest.

Market Risk. The market value of a security may decline due to general market conditions that are not specifically related to a particular company, such as real or perceived adverse economic, political and social conditions, inflation (or expectations for inflation), changes in the outlook for corporate earnings, changes in interest or currency rates or adverse investor sentiment generally.

Tax Status of the Fund. The Fund is taxed as a regular corporation for federal income tax purposes. This differs from most investment companies, which elect to be treated as "regulated investment companies" under the Code in order to avoid paying entity level income taxes. Under current law, the Fund is not eligible to elect treatment as a regulated investment company due to its investments primarily in MLPs invested in energy assets. As a result, the Fund will be obligated to pay applicable federal and state corporate income taxes on its taxable income as opposed to most other investment companies which are not so obligated.

Deferred Tax Liability. Cash distributions from an MLP to the Fund that exceed the Fund's allocable share of such MLP's net taxable income are considered a tax-deferred return of capital that will reduce the Fund's adjusted tax basis in the equity securities of the MLP. These reductions in the Fund's adjusted tax basis in the MLP equity securities will increase the amount of gain (or decrease the amount of loss) recognized by the Fund on a subsequent sale of the securities. The Fund will accrue deferred income taxes for any future tax liability associated with (i) that portion of MLP distributions considered to be a tax-deferred return of capital as well as (ii) capital appreciation of its investments. Upon the sale of an MLP security, the Fund may be liable for previously deferred taxes. The Fund's accrued deferred tax liability will be reflected each day in the Fund's net asset value ("NAV"). Increases in deferred tax liability will decrease NAV. Conversely, decreases in deferred liability will increase NAV, but only to the extent of previously accrued deferred tax liability, i.e., no deferred tax asset will be accrued. The Fund will rely to a large extent on information provided by the MLPs, which is not necessarily timely, to estimate deferred tax liability for purposes of financial statement reporting and determining the NAV. From time to time, ALPS Advisors, Inc. will modify the estimates or assumptions regarding the Fund's deferred tax liability as new information becomes available. The Fund's estimates regarding its deferred tax liability are made in good faith, however, the daily estimate of the Fund's deferred tax liability used to calculate the Fund's NAV could vary significantly from the Fund's actual tax liability. The Fund will generally compute deferred income taxes based on the federal income tax rate applicable to corporations, currently 21%, and an assumed rate attributable to state taxes.

Potential Substantial After-Tax Tracking Error from Underlying Index Performance. As discussed above, the Fund will be subject to taxation on its taxable income. The NAV of Fund Shares will also be reduced by the accrual of any current and deferred tax liabilities. The Underlying Index however is calculated without any deductions for taxes. As a result, the Fund's after tax performance could differ significantly from the Underlying Index even if the pretax performance of the Fund and the performance of the Underlying Index are closely correlated.

Returns of Capital Distributions From the Fund Reduce the Tax Basis of Fund Shares. A portion of the Fund's distributions are expected to be treated as a return of capital for tax purposes. Returns of capital distribution are not taxable income to you but reduce your tax basis in your Fund Shares. Such a reduction in tax basis will result in larger taxable gains and/or lower tax losses on a subsequent sale of Fund Shares.

Industry Specific Risks. The Fund invests primarily in energy infrastructure companies. Energy infrastructure companies are subject to risks specific to the industry they serve including, but not limited to, the following:

	●	fluctuations in energy commodity prices which may impact the volume of energy commodities transported, processes, stored or distributed;
	●	reduced volumes of natural gas or other energy commodities available for transporting, processing or storing;
	●	new construction risks and acquisition risk which can limit growth potential;
	●	a sustained reduced demand for crude oil, natural gas and refined petroleum products resulting from a recession or an increase in market price or higher taxes;
	●	changes in the regulatory environment;
	●	extreme weather;
	●	rising interest rates which could result in a higher cost of capital and drive investors into other investment opportunities;
	●	global, political and economic instability; and
	●	threats of attack by terrorists.

MLP Risk. Investments in securities of MLPs involve risks that differ from investments in common stock including risks related to limited control and limited rights to vote on matters affecting the MLP, risks related to potential conflicts of interest between the MLP and the MLP's general partner, dilution risks and risks related to the general partner's right to require unit-holders to sell their common units at an undesirable time or price due to regulatory changes and cash flow risks. MLP common units and other equity securities can be affected by macro-economic and other factors affecting the stock market in general, expectations of interest rates, investor sentiment towards MLPs or the energy sector, changes in a particular issuer's financial condition, or unfavorable or unanticipated poor performance of a particular issuer (in the case of MLPs, generally measured in terms of distributable cash flow). MLPs holding credit-related investments are subject to interest rate risk and the risk of default on payment obligations by debt issuers. Prices of common units of individual MLPs and other equity securities also can be affected by fundamentals unique to the partnership or company, including cash flow growth, cash generating power and distribution coverage.

MLP Tax Risk. MLPs generally do not pay U.S. federal income tax at the partnership level, although under the centralized audit regime, MLPs are audited and imputed underpayments at the partnership level. A change in current tax law, or a change in the underlying business mix of a given MLP, could result in an MLP being treated as a corporation for U.S. federal income tax purposes, which would result in such MLP being required to pay U.S. federal income tax on its taxable income. The classification of an MLP as a corporation for U.S. federal income tax purposes would have the effect of reducing the amount of cash available for distribution by the MLP and could result in a reduction in the value of your investment in the Fund.

Liquidity Risk. Certain MLP securities may trade less frequently than those of larger companies due to their smaller capitalizations. In the event certain MLP securities experience limited trading volumes, the prices of such MLPs may display abrupt or erratic movements at times. Additionally, it may be more difficult for the Fund to buy and sell significant amounts of such securities without an unfavorable impact on prevailing market prices. As a result, these securities may be difficult to dispose of at a fair price at the times when the Fund is required to do so based on changes in the Underlying Index or to fund redemptions.

Issuer-Specific Risk. The value of an individual security or particular type of security can be more volatile than the market as a whole and can perform differently from the value of the market as a whole.

Non-Diversified Fund Risk. The Fund is considered non-diversified and can invest a greater portion of assets in securities of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a diversified fund.

Fluctuation of Net Asset Value. The NAV of the Fund's Shares will generally fluctuate with changes in the market value of the Fund's holdings. The market prices of the Shares will generally fluctuate in accordance with changes in NAV as well as the relative supply of and demand for Shares on the NYSE Arca, Inc. (the "NYSE Arca"). The Adviser cannot predict whether the Shares will trade below, at or above their NAV.

Index Management Risk. Unlike many investment companies, the Fund is not "actively" managed. Therefore, it would not necessarily sell a security because the security's issuer was in financial trouble unless that security is removed from the Underlying Index.

Non-Correlation Risk. In addition to the risk of tracking error due to the effect of taxes, the Fund's return may not match the return of the Underlying Index for other reasons, including operating expenses incurred by the Fund not applicable to the Underlying Index, costs in buying and selling securities, asset valuation differences and differences between the Fund's portfolio and the Underlying Index resulting from legal restrictions, cash flows or operational inefficiencies.

Risk of Cash Transactions. Unlike many ETFs, the Fund expects to effect redemptions for cash, rather than in-kind. Because the Fund may effect redemptions for cash, it may be required to sell portfolio securities in order to obtain the cash needed to distribute redemption proceeds. As a result, an investment in the Fund may be less tax-efficient than an investment in a more conventional ETF, which may avoid realizing capital gains by making only in-kind redemptions. Moreover, cash transactions may entail higher transaction costs than in-kind transactions, which costs may be passed on to redeemers of Creation Units in the form of redemption transaction fees.

rr_RiskNondiversifiedStatus

The Fund is considered non-diversified and can invest a greater portion of assets in securities of individual issuers than a diversified fund. As a result, changes in the market value of a single investment could cause greater fluctuations in share price than would occur in a diversified fund.

rr_PerformanceNarrativeTextBlock

On July 1, 2011, ALPS Advisors, Inc. assumed all responsibility for selecting the Fund's investments. Performance figures shown below for periods before July 1, 2011 represent performance of the Fund during the times when the Fund's investments were selected by a prior sub-advisor to the Fund. The following bar chart and table provide an indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for certain time periods compare with the average annual returns of the Underlying Index and of another benchmark of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Total return figures assume reinvestment of dividends and include the effect of the Fund's recurring expenses. Updated performance information is available online at www.alpsfunds.com or by calling 877.398.8461.

rr_PerformanceAvailabilityPhone

877.398.8461

rr_PerformancePastDoesNotIndicateFuture

The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.

rr_BarChartClosingTextBlock

Highest Quarterly Return	19.13%	(June 30, 2016)
Lowest Quarterly Return	-18.20%	(September 30, 2015)

The after-tax returns presented in the table below are calculated using highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your specific tax situation and may differ from those shown below. After-tax returns are not relevant to investors who hold Shares of the Fund through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.

rr_PerformanceTableUsesHighestFederalRate

The after-tax returns presented in the table below are calculated using highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes.

dei_TradingSymbol

AMLP

rr_OtherExpensesOverAssets

none

rr_ExpenseExampleYear01

$ 89

rr_ExpenseExampleYear05

482

Annual Return 2011

rr_AnnualReturn2011

10.04%

Annual Return 2013

rr_AnnualReturn2013

18.15%

rr_AnnualReturn2015

(25.89%)

rr_AnnualReturn2017

(7.80%)

rr_AnnualReturn2019

5.95%

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2016

rr_LowestQuarterlyReturnLabel

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(18.20%)

rr_AverageAnnualReturnYear05

(6.15%)

rr_AverageAnnualReturnInceptionDate

Aug. 24, 2010

rr_ProspectusLineItems

rr_AverageAnnualReturnYear05

(6.49%)

rr_AverageAnnualReturnInceptionDate

Aug. 24, 2010

rr_ProspectusLineItems

rr_AverageAnnualReturnYear05

(4.51%)

rr_AverageAnnualReturnInceptionDate

Aug. 24, 2010

rr_ProspectusLineItems

rr_AverageAnnualReturnYear05

(7.04%)

^[2]

rr_AverageAnnualReturnInceptionDate

Aug. 24, 2010

^[2]

rr_ProspectusLineItems

rr_AverageAnnualReturnYear05

(7.00%)

^[2]

rr_AverageAnnualReturnInceptionDate

Aug. 24, 2010

^[2]

rr_ProspectusLineItems

Objective, Secondary [Text Block]

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

rr_ObjectiveSecondaryTextBlock

As a secondary objective, the Fund seeks to provide total return through income and capital appreciation.

rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund ("Shares"). Investors purchasing or selling Shares in the secondary market may be subject to fees and expenses (including customary brokerage commissions) charged by their broker. These fees and expenses are not included in the expense example below.

rr_PortfolioTurnoverHeading

PORTFOLIO TURNOVER

rr_PortfolioTurnoverRate

26.00%

rr_ExpenseExampleHeading

Example

rr_StrategyHeading

PRINCIPAL INVESTMENT STRATEGIES

rr_RiskHeading

PRINCIPAL INVESTMENT RISKS

rr_RiskLoseMoney

Investors should consider the following risk factors and special considerations associated with investing in the Fund, which may cause you to lose money.

Performance Information Illustrates Variability of Returns [Text]

rr_BarChartAndPerformanceTableHeading

FUND PERFORMANCE

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart and table provide an indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for a certain time period compare with the average annual returns of the Underlying Index and of another benchmark of market performance.

rr_PerformanceAvailabilityWebSiteAddress

www.alpsfunds.com

rr_BarChartHeading

Annual Total Returns (calendar years ended 12/31)

rr_PerformanceTableHeading

Average Annual Total Returns For periods ended December 31, 2019

rr_PerformanceTableNotRelevantToTaxDeferred

After-tax returns are not relevant to investors who hold Shares of the Fund through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.

rr_ProspectusLineItems

Total Annual Fund Operating Expenses

rr_ManagementFeesOverAssets

0.65%

rr_ExpensesOverAssets

0.65%

Three Years

rr_ExpenseExampleYear03

208

Ten Years

rr_ExpenseExampleYear10

$ 810

rr_AnnualReturn2015

(37.29%)

rr_AnnualReturn2017

(0.09%)

rr_AnnualReturn2019

21.20%

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2019

rr_LowestQuarterlyReturnLabel

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(23.18%)

rr_AverageAnnualReturnYear05

(2.51%)

rr_AverageAnnualReturnInceptionDate

Oct. 31, 2013

rr_ProspectusLineItems

rr_AverageAnnualReturnYear05

(3.05%)

rr_AverageAnnualReturnInceptionDate

Oct. 31, 2013

rr_ProspectusLineItems

rr_AverageAnnualReturnYear05

(1.93%)

rr_AverageAnnualReturnInceptionDate

Oct. 31, 2013

rr_ProspectusLineItems

rr_AverageAnnualReturnYear05

(1.74%)

^[2]

rr_AverageAnnualReturnInceptionDate

Oct. 31, 2013

^[2]

rr_ProspectusLineItems

rr_AverageAnnualReturnYear05

(7.00%)

^[2]

rr_AverageAnnualReturnInceptionDate

Oct. 31, 2013

^[2]

rr_ProspectusLineItems

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

rr_ExpenseHeading

FEES AND EXPENSES OF THE FUND

rr_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

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. During the most recent fiscal year ended November 30, 2019, the Fund's portfolio turnover rate was 44% of the average value of its portfolio.

rr_ExpenseExchangeTradedFundCommissions

Investors purchasing or selling Shares in the secondary market may be subject to fees and expenses (including customary brokerage commissions) charged by their broker.

rr_ExpenseExampleNarrativeTextBlock

The following example is intended to help you compare the cost of investing in the Fund with the costs of investing in other funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then hold or redeem all of your Shares at the end of those periods. The example also assumes that your investment has a 5% return each year, that all dividends and capital gains are reinvested each year, and that the Fund's operating expenses remain the same each year.

Although your actual costs may be higher or lower, based on these assumptions your costs would be:

rr_StrategyNarrativeTextBlock

The Fund seeks to achieve its investment objective by investing in a global portfolio of fixed income securities of various maturities, ratings and currency denominations. The Fund utilizes various investment strategies in a broad array of fixed income sectors. The Fund allocates its investments based upon the analysis of RiverFront Investment Group, LLC ("RiverFront" or the "Sub-Adviser") of the pertinent economic and market conditions, as well as yield, maturity and currency considerations.

The Fund's portfolio is constructed through a two-step process. The first step is setting the strategic allocation among different fixed income asset classes, with the objective being to construct an allocation that is designed to balance the probability of upside returns with downside risks for investors with a three- to five-year time horizon for their investments.

The second step is tactically adjusting these allocations as market conditions warrant and determining security selection within those asset classes in order to maximize potential returns over time. The strategic allocation across long-term, medium-term and short-term investment grade securities, long-term and short-term high yield securities and emerging market debt is adjusted at least annually or as market conditions warrant and is determined by a quantitative methodology. This methodology models historical returns as a function of initial valuation conditions and creates estimates of potential returns and downside risks consistent with historical market behavior. The capital market assumptions produced by this methodology are then incorporated into a proprietary Mean Reversion Optimization ("MRO") process to produce the model weighting for each of the major fixed income asset classes.

The Fund may purchase fixed income securities issued by U.S. or foreign corporations or financial institutions, including debt securities of all types and maturities, convertible securities and preferred stocks. The Fund also may purchase securities issued or guaranteed by the U.S. government or foreign governments (including foreign states, provinces and municipalities) or their agencies and instrumentalities ("government entities") or issued or guaranteed by international organizations designated or supported by multiple government entities to promote economic reconstruction or development ("supranational entities"). The Fund may purchase or sell securities on a when issued, delayed delivery or forward commitment basis. The Fund may also invest in other exchange-traded funds ("ETFs") and/or closed-end funds which invest in fixed income securities.

The Fund has not established any credit rating criteria for the fixed income securities in which it may invest, and it may invest entirely in high yield securities ("junk bonds"). Junk bonds are debt securities that are rated below investment grade by nationally recognized statistical rating organizations ("NRSROs"), or are unrated securities that the Sub-Adviser believes are of comparable quality. The Sub-Adviser considers the credit ratings assigned by NRSROs as one of several factors in its independent credit analysis of issuers.

The Fund may invest without limitation in U.S. dollar-denominated securities of foreign issuers in developed markets. Additionally, the Fund can invest up to 50% of its assets in non-dollar denominated securities. The Fund may also invest up to 50% of its assets in the securities of issuers located in emerging markets. In certain circumstances, the Sub-Adviser may attempt to offset a portion or all of the foreign currency exposure in these securities by entering into contracts with banks, brokers or dealers to purchase or sell securities or foreign currencies at a future date ("forward contracts"). The Fund may elect to enter into swap contracts that effectively bundle the purchase of foreign bonds and the hedging of foreign currency into a single transaction.

The average maturity or duration of the Fund's portfolio of fixed income securities will vary based on the Sub-Adviser's assessment of economic and market conditions, as well as current and anticipated changes in interest rates; however, the Sub-Adviser intends to manage the Fund's portfolio so that it has an average duration of between one and five years, under normal circumstances. Duration measures the price sensitivity of a security to interest rate changes. The longer the duration, the more sensitive the Fund's portfolio will be to a change in interest rates. A 1% change in interest rates is typically estimated to change the price of a fixed income security by 1% for each year of the security's duration. For example, if a fixed income security has a duration of three years, a 1% rise in interest rates would typically be expected to reduce the price of the security by approximately 3%. Similar estimates would typically apply to a portfolio of fixed income securities, such as the Fund's, based on the portfolio's average duration. As the value of a security changes over time, so will its duration, which in turn will affect the Fund's duration.

rr_RiskNarrativeTextBlock

Investors should consider the following risk factors and special considerations associated with investing in the Fund, which may cause you to lose money. The following principal risk factors have been identified for the Fund. See also the sections "Additional Information about the Fund's Principal Investment Risks" and "Additional Risk Considerations" for additional information about the Fund's risk factors.

Investment Risk. An investment in the Fund is subject to investment risk, including the possible loss of the entire principal amount that you invest.

Credit/Default Risk. Credit risk is the risk that issuers or guarantors of debt instruments or the counterparty to a derivatives contract, repurchase agreement or loan of portfolio securities is unable or unwilling to make timely interest and/or principal payments or otherwise honor its obligations. Credit rating downgrades and defaults (failure to make interest or principal payment) may potentially reduce the Fund's income and Share price.

Interest Rate Risk. As interest rates rise, the value of fixed income securities held by the Fund are likely to decrease. Securities with longer durations tend to be more sensitive to interest rate changes, making them more volatile than securities with shorter durations. The Fund may face a heightened level of interest rate risk due to certain changes in monetary policy, such as interest rate changes by the Federal Reserve. Rising interest rates may also lead to decreased liquidity in the bond markets, making it more difficult for the Fund to value or sell its bond investments at any given time.

Junk Bond Risk. The Fund may invest in junk bonds that are considered speculative. Junk bonds are subject to the increased risk of an issuer's inability to meet principal and interest payment obligations. These securities may be subject to greater price volatility due to such factors as specific corporate developments, interest rate sensitivity, negative perceptions of the junk bond markets generally and less secondary market liquidity. Even if an established secondary market exists, less active markets diminish the Fund's ability to obtain accurate market quotations when valuing the portfolio securities and therefore give rise to valuation risk.

Call Risk/Prepayment Risk. During periods of falling interest rates, an issuer of a callable bond may exercise its right to pay principal on an obligation earlier than expected. This may result in the Fund reinvesting proceeds at lower interest rates, resulting in a decline in the Fund's income.

Income Risk. Income risk is the risk that falling interest rates will cause the Fund's income to decline.

Liquidity Risk. Liquidity risk exists when particular investments are difficult to purchase or sell. Such securities may become illiquid under adverse market or economic conditions and/or due to specific adverse changes in the condition of a particular issuer. If the Fund invests in illiquid securities or securities that become illiquid, Fund returns may be reduced because the Fund may be unable to sell the illiquid securities at an advantageous time or price.

U.S. Government Securities Risk. There are different types of U.S. government securities with different levels of credit risk, including the risk of default, depending on the nature of the particular government support for that security. For example, a U.S. government-sponsored entity, such as Fannie Mae or Freddie Mac, although chartered or sponsored by an Act of Congress, may issue securities that are neither insured nor guaranteed by the U.S. Treasury and are therefore riskier than those that are.

Foreign Investment Risk. The Fund's investments in non-U.S. issuers may involve unique risks of loss that are not typically associated with investing in securities of U.S. issuers, including, among others, less liquidity generally, greater market volatility than U.S. securities and less public or complete financial information than is required for U.S. issuers. In addition, adverse political, economic, social, regulatory, business or environmental developments could undermine the value of the Fund's investments or prevent the Fund from realizing the full value of its investments.

Emerging Markets Risk. The Fund may invest in securities and instruments that are economically tied to emerging market countries. Emerging markets countries may have relatively unstable governments; may present heightened risks of nationalization of businesses, restrictions on foreign ownership, less liquidity and prohibitions on the repatriation of assets; and may have economies based on only a few industries, making them more vulnerable to changes in local or global trade conditions and more sensitive to debt burdens, inflation rates or adverse news and events.

Foreign Currency Risk. The value of the Fund's investments denominated in foreign currencies may fluctuate relative to the value of the U.S. dollar. The Sub-Adviser does not intend, under normal circumstances, to attempt to hedge against currency risk. The Sub-Adviser may, in certain circumstances, attempt to reduce this risk by entering into foreign currency forward contracts, but its attempts may not be successful. Furthermore, such transactions may reduce or preclude the opportunity for gain if the value of the currency should move in the direction opposite to the position taken.

Risk of Investment in Other Investment Companies. The market value of the shares of other investment companies may be less than their net asset values ("NAVs"). As an investor in investment companies, the Fund would bear its ratable share of that entity's expenses, while continuing to pay its own advisory and administration fees and other expenses, causing Fund shareholders to absorb duplicate levels of fees with respect to investments in other investment companies.

Convertible Securities Risk. The Fund's investments in convertible securities subject the Fund to the risks associated with both fixed income securities and common stocks. To the extent that a convertible security's investment value is greater than its conversion value, its price will be likely to increase when interest rates fall and decrease when interest rates rise, as with a fixed income security. If the conversion value exceeds the investment value, the price of the convertible security will tend to fluctuate directly with the price of the underlying equity security.

Preferred Stock Risk. Preferred stock generally has a preference as to dividends and liquidation over an issuer's common stock but ranks junior to debt securities in an issuer's capital structure. Unlike interest payments on debt securities preferred stock dividends are payable only if declared by the issuer's board of directors. Preferred stock also may be subject to optional or mandatory redemption provisions.

Issuer-Specific Risk. The value of an individual security or particular type of security can be more volatile than the market as a whole and can perform differently from the value of the market as a whole.

Management Risk. The Fund is subject to management risk because it is an actively managed portfolio. In managing the Fund's portfolio securities, the Sub-Adviser will apply investment techniques and risk analyses in making investment decisions for the Fund, but there can be no guarantee that these will produce the desired results. The Sub-Adviser's decisions relating to the Fund's duration will also affect the Fund's yield, and in unusual circumstances will affect its share price. To the extent that the Sub-Adviser anticipates interest rates imprecisely, the Fund's yield at times could lag those of other similarly managed funds.

Fluctuation of Net Asset Value. The NAV of the Fund's Shares will generally fluctuate with changes in the market value of the Fund's holdings. The market prices of the Shares will generally fluctuate in accordance with changes in NAV as well as the relative supply of and demand for the Shares on the NYSE Arca, Inc. (the "NYSE Arca"). The Sub-Adviser cannot predict whether the Shares will trade below, at or above their NAV.

Risk of Cash Transactions. Unlike many ETFs, the Fund primarily effects creations and redemptions partly or wholly for cash, rather than in-kind. Because the Fund may effect redemptions for cash, it may be required to sell portfolio securities in order to obtain the cash needed to distribute redemption proceeds. As a result, an investment in the Fund may be less tax-efficient than an investment in a more conventional ETF, which may avoid realizing capital gains by making only in-kind redemptions. Moreover, cash transactions entail higher transaction costs than in-kind transactions, which costs may be passed on to purchasers and redeemers of Creation Units in the form of creation and redemption transaction fees.

Swaps Risk. The Fund expects to use cleared and over-the-counter ("OTC") swap agreements, which involve liquidity, interest rate, investment, credit/default and management risks, as well as the potential for mispricing or valuation complexity. The Fund's use of swap agreements may result in losses to the Fund, a reduction in the Fund's returns and/or increased volatility. OTC swap agreements are also subject to the risk that the other party in the transaction will not fulfill its contractual obligations.

Derivatives Risk. Derivatives are financial instruments, such as futures, swaps and options, whose values are based on the value of one or more indicators, such as a security, asset, currency, interest rate, or index. Derivatives involve risks different from, and possibly greater than, the risks associated with investing directly in securities and other more traditional investments. For example, derivatives involve the risk of mispricing or improper valuation and the risk that changes in the value of a derivative may not correlate perfectly with the underlying indicator. Derivative transactions can create investment leverage, may be highly volatile and the Fund could lose more than the amount it invests. Many derivative transactions are entered into "over-the-counter" (not on an exchange or contract market); as a result, the value of such a derivative transaction will depend on the ability and the willingness of the Fund's counterparty to perform its obligations under the transaction. If a counterparty were to default on its obligations, the Fund's contractual remedies against such counterparty may be subject to bankruptcy and insolvency laws, which could affect the Fund's rights as a creditor (e.g., the Fund may not receive the net amount of payments that it is contractually entitled to receive). A liquid secondary market may not always exist for the Fund's derivative positions at any time.

Forward Currency Contracts Risk. A forward currency contract is a negotiated agreement between two parties to exchange specified amounts of two or more currencies at a specified future time at a specified rate. The rate specified by the forward contract can be higher or lower than the spot rate between the currencies that are the subject of the contract. By entering into a forward currency contract for the purchase or sale, for a fixed amount of dollars or other currency, of the amount of foreign currency involved in the underlying security transactions, the Fund may be able to protect itself against a possible loss resulting from an adverse change in the relationship between the U.S. dollar or other currency which is being used for the security purchase and the foreign currency in which the security is denominated during the period between the date on which the security is purchased or sold and the date on which payment is made or received. Furthermore, such transactions reduce or preclude the opportunity for gain if the value of the currency should move in the direction opposite to the position taken. There is an additional risk to the extent that currency contracts create exposure to currencies in which the Fund's securities are not denominated. Unanticipated changes in currency prices may result in poorer overall performance for the Fund than if it had not entered into such contracts. Forward currency contracts may limit gains on portfolio securities that could otherwise be realized had they not been utilized and could result in losses. The contracts also may increase the Fund's volatility and may involve a significant amount of risk relative to the investment of cash.

Asset Allocation Program Risk. The Sub-Adviser specializes in managing asset allocation portfolios, which invest in various investment vehicles, including the Fund and other ETFs, to obtain targeted amounts of exposure to different asset classes. The Fund was developed to serve as, and will serve as, an investment vehicle for such asset allocation portfolios. As the manager of the Fund and the portfolios, the Sub-Adviser is likely to encounter conflicts of interest. For example, the Sub-Adviser may need to reduce its asset allocation portfolios' exposure to an asset class to which the portfolios obtain exposure by investing in the Fund. Under such circumstances, the Sub-Adviser would liquidate some or all of the portfolios' investments in the Fund, which could adversely affect the Fund.

Quantitative Methodology Risk. The Sub-Adviser uses certain quantitative methodologies to help assess the criteria of issuers to be included in the Fund's portfolio, including information that may be based on assumptions and estimates. None of the Fund, the Adviser or the Sub-Adviser can offer assurances that the quantitative methodology will provide an accurate assessment of included issuers.

Performance Information Illustrates Variability of Returns [Text]

rr_BarChartAndPerformanceTableHeading

FUND PERFORMANCE

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart and table provide an indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for a certain time period compare with the average annual returns of the Fund's benchmark index and of another benchmark of market performance.

rr_PerformanceAvailabilityWebSiteAddress

www.alpsfunds.com

rr_BarChartHeading

Annual Total Returns (calendar years ended 12/31)

rr_PerformanceTableHeading

Average Annual Total Returns For periods ended December 31, 2019

rr_PerformanceTableNotRelevantToTaxDeferred

After-tax returns are not relevant to investors who hold Shares of the Fund through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.

rr_ProspectusLineItems

Acquired Fund Fees and Expenses

rr_ManagementFeesOverAssets

0.46%

^[3]

rr_AcquiredFundFeesAndExpensesOverAssets

0.01%

rr_ExpenseExampleYear01

$ 48

rr_ExpenseExampleYear05

263

rr_AnnualReturn2014

3.08%

rr_AnnualReturn2016

8.77%

rr_AnnualReturn2018

(0.07%)

rr_HighestQuarterlyReturnLabel

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

3.35%

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2015

rr_AverageAnnualReturnYear01

6.92%

rr_AverageAnnualReturnSinceInception

4.23%

rr_AverageAnnualReturnYear01

5.23%

rr_AverageAnnualReturnSinceInception

2.50%

rr_AverageAnnualReturnYear01

4.08%

rr_AverageAnnualReturnSinceInception

2.46%

rr_AverageAnnualReturnYear01

8.72%

^[2]

rr_AverageAnnualReturnSinceInception

3.37%

^[2]

rr_RiskReturnHeading

Summary Section Alps Sector Dividend Dogs ETF (The "Fund")

rr_ObjectivePrimaryTextBlock

The Fund seeks investment results that replicate as closely as possible, before fees and expenses, the performance of the S-Network^® Sector Dividend Dogs Index (ticker symbol SDOGX) (the "Underlying Index").

rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund ("Shares"). Investors purchasing or selling Shares in the secondary market may be subject to fees and expenses (including customary brokerage commissions) charged by their broker. These fees and expenses are not included in the expense example below.

rr_PortfolioTurnoverHeading

PORTFOLIO TURNOVER

rr_PortfolioTurnoverRate

55.00%

rr_ExpenseExampleHeading

Example

rr_StrategyHeading

PRINCIPAL INVESTMENT STRATEGIES

rr_RiskHeading

PRINCIPAL INVESTMENT RISKS

rr_RiskLoseMoney

Investors should consider the following risk factors and special considerations associated with investing in the Fund, which may cause you to lose money.

rr_PerformanceNarrativeTextBlock

The following bar chart and table provide an indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for certain time periods compare with the average annual returns of the Underlying Index and of another benchmark of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Total return figures assume reinvestment of dividends and include the effect of the Fund's recurring expenses. Updated performance information is available online at www.alpsfunds.com or by calling 866.675.2639.

rr_PerformanceAvailabilityPhone

866.675.2639

rr_PerformancePastDoesNotIndicateFuture

The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.

rr_BarChartClosingTextBlock

Highest Quarterly Return	14.11%	(March 31, 2013)
Lowest Quarterly Return	-13.81%	(December 31, 2018)

The after-tax returns presented in the table below are calculated using highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your specific tax situation and may differ from those shown below. After-tax returns are not relevant to investors who hold Shares of the Fund through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.

rr_PerformanceTableUsesHighestFederalRate

The after-tax returns presented in the table below are calculated using highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes.

dei_TradingSymbol

SDOG

rr_OtherExpensesOverAssets

none

rr_ExpenseExampleYear01

$ 41

rr_ExpenseExampleYear05

224

Annual Return 2013

rr_AnnualReturn2013

34.29%

rr_AnnualReturn2015

(3.20%)

rr_AnnualReturn2017

12.67%

rr_AnnualReturn2019

24.09%

rr_BarChartHighestQuarterlyReturnDate

Mar. 31, 2013

rr_LowestQuarterlyReturnLabel

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(13.81%)

rr_AverageAnnualReturnYear05

8.00%

rr_AverageAnnualReturnInceptionDate

Jun. 29, 2012

rr_ProspectusLineItems

rr_AverageAnnualReturnYear05

7.10%

rr_AverageAnnualReturnInceptionDate

Jun. 29, 2012

rr_ProspectusLineItems

rr_AverageAnnualReturnYear05

6.16%

rr_AverageAnnualReturnInceptionDate

Jun. 29, 2012

rr_ProspectusLineItems

rr_AverageAnnualReturnYear05

8.49%

^[2]

rr_AverageAnnualReturnInceptionDate

Jun. 29, 2012

^[2]

rr_ProspectusLineItems

rr_AverageAnnualReturnYear05

11.70%

^[2]

rr_AverageAnnualReturnInceptionDate

Jun. 29, 2012

^[2]

rr_ProspectusLineItems

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

rr_ExpenseHeading

FEES AND EXPENSES OF THE FUND

rr_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

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. During the most recent fiscal year ended November 30, 2019, the Fund's portfolio turnover rate was 58% of the average value of the Fund.

rr_ExpenseExchangeTradedFundCommissions

Investors purchasing or selling Shares in the secondary market may be subject to fees and expenses (including customary brokerage commissions) charged by their broker.

rr_ExpenseExampleNarrativeTextBlock

The following example is intended to help you compare the cost of investing in the Fund with the costs of investing in other funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then hold or redeem all of your Shares at the end of those periods. The example also assumes that your investment has a 5% return each year, that all dividends and capital gains are reinvested each year, and that the Fund's operating expenses remain the same each year.

Although your actual costs may be higher or lower, based on these assumptions your costs would be:

rr_StrategyNarrativeTextBlock

ALPS Advisors, Inc. (the "Adviser") will seek investment results that replicate as closely as possible, before fees and expenses, the performance of the Underlying Index. The Underlying Index is a rules-based index intended to give investors a means of tracking the overall performance of the highest dividend paying stocks (i.e. "Dividend Dogs") in the S-Network Developed Markets (ex NA) Index, a universe of mainly large capitalization stocks in international developed markets not located in the Americas (the "S-Net Developed Markets") on a sector by-sector basis. "Dividend Dogs" refers to the five stocks in each of the Global Industry Classification Standard ("GICS") sectors (excluding the real estate sector) that make up the S-Net Developed Markets which offer the highest dividend yields.

The Underlying Index generally consists of 50 stocks on each annual reconstitution date, which is the third Friday of December each year. The Underlying Index's stocks must be constituents of the S-Net Developed Markets universe, which includes stocks whose domicile and primary exchange listings are in countries in Europe, Australia and the Far East and identified by the World Bank as High Income Countries, and excludes stocks from countries a) located in the Americas, b) that do not have stock exchanges, c) were members of the former Comecon (Council for Mutual Economic Assistance, a former economic organization led by the Soviet Union that comprised Eastern Bloc countries and other socialist states elsewhere in the world) and d) whose companies, in the opinion of the Index Provider (defined below), have idiosyncratic dividend policies. The World Bank's methodology for identifying High Income Countries is based on the country's gross national income (GNI) per capita. The selection criteria for the universe also includes requirements for sector inclusion, primary exchange listing, minimum market capitalization, share price, average daily trading volume and other factors.

The Underlying Index methodology selects the five stocks in ten of the eleven GICS sectors (excluding the real estate sector) that make up the S-Net Developed Markets which offer the highest dividend yields as of the last trading day of November. Dividend yield is computed based on the regular cash dividends paid by the company over the previous twelve month period, divided by the share price. The eligible stocks that are selected for inclusion in the Underlying Index's portfolio are equally weighted. If there are less than 5 eligible securities represented in any sector, then the Underlying Index will include only those securities that qualify. The Underlying Index is rebalanced quarterly.

rr_RiskNarrativeTextBlock

Investors should consider the following risk factors and special considerations associated with investing in the Fund, which may cause you to lose money.

Investment Risk. An investment in the Fund is subject to investment risk, including the possible loss of the entire principal amount that you invest.

Market Risk. The values of equity securities, such as common stocks and preferred stock, may decline due to general market conditions that are not specifically related to a particular company, such as real or perceived adverse economic, political and social conditions, inflation (or expectations for inflation), changes in the general outlook for corporate earnings, changes in interest or currency rates or adverse investor sentiment generally. Equity securities generally have greater price volatility than fixed-income securities.

Foreign Investment Risk. The Fund's investments in non-U.S. issuers may involve unique risks compared to investing in securities of U.S. issuers, including, among others, less liquidity generally, greater market volatility than U.S. securities and less complete financial information than for U.S. issuers. In addition, adverse political, economic or social developments could undermine the value of the Fund's investments or prevent the Fund from realizing the full value of its investments. Finally, the value of the currency of the country in which the Fund has invested could decline relative to the value of the U.S. dollar, which may affect the value of the investment to U.S. investors.

Non-Correlation Risk. The Fund's return may not match the return of the Underlying Index for a number of reasons, including operating expenses incurred by the Fund not applicable to the Underlying Index, costs in buying and selling securities, asset valuation differences and differences between the Fund's portfolio and the Underlying Index resulting from legal restrictions, cash flows or operational inefficiencies. Tax withholdings imposed by foreign countries may also contribute to differences between the Fund's return and the return of the Underlying Index.

Index Management Risk. Unlike many investment companies, the Fund is not "actively" managed. Therefore, it would not necessarily sell a security because the security's issuer was in financial trouble unless that security is removed from the Underlying Index.

Issuer-Specific Risk. The value of an individual security or particular type of security can be more volatile than the market as a whole and can perform differently from the value of the market as a whole.

Geographic Concentration Risk. To the extent the Underlying Index and the Fund are significantly comprised of securities of issuers from a single country, the Fund would be more likely to be impacted by events or conditions affecting that country.

Underlying Sector Risk. The Fund will be exposed to the additional risks associated with its investments in companies of each GICS sector of the Underlying Index. For more on these risks, see "Risks of Underlying Sectors" in this Prospectus.

High Dividend Yield Style Risk. While the Fund may hold securities of companies that have historically paid a high dividend yield, those companies may reduce or discontinue their dividends, thus reducing the yield of the Fund. Also, the market return of high dividend yield securities, in certain market conditions, may be worse than the market return of other investment strategies or the overall stock market.

Fluctuation of Net Asset Value. The net asset value ("NAV") of the Fund's Shares will generally fluctuate with changes in the market value of the Fund's holdings. The market prices of the Shares will generally fluctuate in accordance with changes in NAV as well as the relative supply of and demand for the Shares on the NYSE Arca, Inc. (the "NYSE Arca"). The Adviser cannot predict whether the Shares will trade below, at or above their NAV.

Performance Information Illustrates Variability of Returns [Text]

rr_BarChartAndPerformanceTableHeading

FUND PERFORMANCE

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart and table provide an indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for a certain time period compare with the average annual returns of the Underlying Index and of another benchmark of market performance.

rr_PerformanceAvailabilityWebSiteAddress

www.alpsfunds.com

rr_BarChartHeading

Annual Total Returns (calendar years ended 12/31)

rr_PerformanceTableHeading

Average Annual Total Returns For periods ended December 31, 2019

rr_PerformanceTableUsesHighestFederalRate

The after-tax returns presented in the table below are calculated using highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes.

dei_TradingSymbol

IDOG

rr_OtherExpensesOverAssets

none

rr_ExpenseExampleYear01

$ 51

rr_ExpenseExampleYear05

280

rr_AnnualReturn2014

(6.00%)

rr_AnnualReturn2016

3.97%

rr_AnnualReturn2018

(13.09%)

rr_HighestQuarterlyReturnLabel

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

10.55%

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2018

rr_AverageAnnualReturnYear01

20.86%

rr_AverageAnnualReturnSinceInception

5.63%

rr_AverageAnnualReturnYear01

19.54%

rr_AverageAnnualReturnSinceInception

4.79%

rr_AverageAnnualReturnYear01

13.63%

rr_AverageAnnualReturnSinceInception

4.48%

rr_AverageAnnualReturnYear01

21.36%

^[4]

rr_AverageAnnualReturnSinceInception

6.05%

^[4]

rr_AverageAnnualReturnYear01

22.26%

^[4],[5]

rr_AverageAnnualReturnSinceInception

6.42%

^[4],[5]

rr_AverageAnnualReturnYear01

22.01%

^[4]

rr_AverageAnnualReturnSinceInception

6.20%

^[4]

rr_RiskReturnHeading

SUMMARY SECTION Alps Emerging Sector Dividend Dogs ETF (The "Fund")

rr_ObjectivePrimaryTextBlock

The Fund seeks investment results that replicate as closely as possible, before fees and expenses, the performance of the S-Network^® Emerging Sector Dividend Dogs Index (ticker symbol EDOGX) (the "Underlying Index").

rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund ("Shares"). Investors purchasing or selling Shares in the secondary market may be subject to fees and expenses (including customary brokerage commissions) charged by their broker. These fees and expenses are not included in the expense example below.

rr_PortfolioTurnoverHeading

PORTFOLIO TURNOVER

rr_PortfolioTurnoverRate

83.00%

rr_ExpenseExampleHeading

Example

rr_StrategyHeading

PRINCIPAL INVESTMENT STRATEGIES

rr_RiskHeading

PRINCIPAL INVESTMENT RISKS

rr_RiskLoseMoney

Investors should consider the following risk factors and special considerations associated with investing in the Fund, which may cause you to lose money.

rr_PerformanceNarrativeTextBlock

The following bar chart and table provide an indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for a certain time period compare with the average annual returns of the Underlying Index and of another benchmark of market performance. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Total return figures assume reinvestment of dividends and include the effect of the Fund's recurring expenses. Updated performance information is available online at www.alpsfunds.com or by calling 866.675.2639.

rr_PerformanceAvailabilityPhone

866.675.2639

rr_PerformancePastDoesNotIndicateFuture

The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.

Performance Table Market Index Changed

rr_BarChartClosingTextBlock

Highest Quarterly Return	14.43%	(March 31, 2016)
Lowest Quarterly Return	-12.90%	(September 30, 2015)

The after-tax returns presented in the table below are calculated using highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your specific tax situation and may differ from those shown below. After-tax returns are not relevant to investors who hold Shares of the Fund through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.

rr_PerformanceTableMarketIndexChanged

Effective December 13, 2019, the Fund replaced the MSCI EM Index as the Fund's secondary benchmark for performance comparison purposes. The Adviser made this recommendation to the Board because the Fund's new secondary benchmark, the Morningstar Emerging Markets Index, closely aligns with the Fund's investment strategies and investment restrictions. Returns for both benchmarks will be shown for a transition period.

rr_PerformanceTableNotRelevantToTaxDeferred

After-tax returns are not relevant to investors who hold Shares of the Fund through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.

rr_ProspectusLineItems

Total Annual Fund Operating Expenses

rr_ManagementFeesOverAssets

0.60%

rr_ExpensesOverAssets

0.60%

Three Years

rr_ExpenseExampleYear03

192

Ten Years

rr_ExpenseExampleYear10

$ 750

rr_AnnualReturn2016

14.80%

rr_AnnualReturn2018

(15.79%)

rr_HighestQuarterlyReturnLabel

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

14.43%

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2015

rr_AverageAnnualReturnYear01

12.70%

rr_AverageAnnualReturnSinceInception

1.63%

rr_AverageAnnualReturnYear01

11.61%

rr_AverageAnnualReturnSinceInception

0.83%

rr_AverageAnnualReturnYear01

8.63%

rr_AverageAnnualReturnSinceInception

1.33%

rr_AverageAnnualReturnYear01

13.59%

^[4]

rr_AverageAnnualReturnSinceInception

2.49%

^[4]

rr_AverageAnnualReturnYear01

18.12%

^[4],[6]

rr_AverageAnnualReturnSinceInception

5.29%

^[4],[6]

rr_AverageAnnualReturnYear01

18.44%

^[4]

rr_AverageAnnualReturnSinceInception

4.89%

^[4]

rr_RiskReturnHeading

Summary Section* ALPS REIT DIVIDEND DOGS ETF (THE "FUND") * Effective January 2, 2020, the Cohen & Steers Global Realty Majors ETF (Ticker: GRI) changed its name and ticker symbol to the ALPS REIT Dividend Dogs ETF (Ticker: RDOG).

rr_ObjectivePrimaryTextBlock

The Fund seeks investment results that replicate as closely as possible, before fees and expenses, the performance of an index called the S-Network^® REIT Dividend Dogs Index (ticker symbol RDOGX) (the "Underlying Index").

rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund ("Shares"). Investors purchasing or selling Shares in the secondary market may be subject to fees and expenses (including customary brokerage commissions) charged by their broker. These fees and expenses are not included in the expense example below.

rr_PortfolioTurnoverHeading

PORTFOLIO TURNOVER

Expenses Restated to Reflect Current [Text]

rr_PortfolioTurnoverRate

10.00%

rr_ExpensesRestatedToReflectCurrent

Restated to reflect current fees.

rr_ExpenseExampleNarrativeTextBlock

The following example is intended to help you compare the cost of investing in the Fund with the costs of investing in other funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then hold or 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 each year.

Although your actual costs may be higher or lower, based on these assumptions your costs would be:

rr_StrategyNarrativeTextBlock

ALPS Advisors, Inc. (the "Adviser") will seek investment results that replicate as closely as possible, before fees and expenses, the performance of the Underlying Index. The Underlying Index is a rules-based index intended to give investors a means of tracking the overall performance of the highest dividend paying real estate investment trusts ("REITs") (i.e. "Dividend Dogs") in the S-Network^® US Composite REIT Index, a universe of mainly REITs listed in the United States (the "S-Net U.S. REIT"), on a segment-by-segment basis. "Dividend Dogs" refers to the five REITs in each of the nine segments that make up the S-Net U.S. REIT which offer the highest dividend yields.

The Fund will normally invest at least 90% of its total assets in common stocks and other equity securities (which may include REITs, American depositary receipts ("ADRs"), American depositary shares ("ADSs") and global depositary receipts ("GDRs")) that comprise the Underlying Index. The Fund may invest in companies with a market capitalization of greater than $50 million as of the annual reconstitution date, which is the third Friday of December each year. The Fund generally will invest in all of the securities that comprise the Underlying Index in proportion to their weightings in the Underlying Index.

The Underlying Index, like the S-Net U.S. REIT from which components of the Underlying Index are selected, divides into nine segments, eight of which are based on Global Industry Classification Standard ("GICS") Sub-Industries (excluding Technology REITs involved in cell towers and/or data centers) and a separate Technology REIT segment based on the research of the Underlying Index provider, S-Network^® Global Indexes, Inc. (the "Index Provider"). The Underlying Index generally consists of 45 REITs on each annual reconstitution date. The Underlying Index's REITs must be constituents of the S-Net U.S. REIT universe, which includes a universe of mainly REITs listed in the United States. The selection criteria for the universe also includes requirements for segment inclusion, primary exchange listing, minimum market capitalization, share price, average daily trading volume and other factors. The Underlying Index is rebalanced quarterly.

Individual securities to be included in the Underlying Index are selected based on a ranking system within each segment that selects the top five REITs in the segment by indicated dividend yield as of the last trading day of November that have funds from operations per share greater than their trailing-12-month dividends per share. Indicated dividend yield is computed based on the last regular cash dividend paid by the company multiplied by the payment frequency, divided by the share price. (Special dividends are not included). The eligible REITs that are selected for inclusion in the Underlying Index's portfolio are equally weighted.

rr_RiskNarrativeTextBlock

Investors should consider the following risk factors and special considerations associated with investing in the Fund, which may cause you to lose money.

Investment Risk. An investment in the Fund is subject to investment risk, including the possible loss of the entire principal amount that you invest.

Market Risk. The values of equity securities, such as common stocks and preferred stock, may decline due to general market conditions that are not specifically related to a particular company, such as real or perceived adverse economic, political and social conditions, inflation (or expectations for inflation), changes in the general outlook for corporate earnings, changes in interest or currency rates or adverse investor sentiment generally. Equity securities generally have greater price volatility than fixed-income securities.

Real Estate Investment Risk. The Fund invests in companies in the real estate industry, including real estate investment trusts ("REITs"). Therefore, the Fund is subject to the risks associated with investing in real estate, which may include, but are not limited to, possible declines in the value of real estate; adverse changes in national, state or local real estate conditions; obsolescence of properties; changes in the availability, cost and terms of mortgage funds (including changes in interest rates); the impact of changes in environmental laws; overbuilding in a real estate company's market; and environmental problems.

REIT Investment Risk. In addition to risks related to investments in real estate generally, investing in REITs involves certain other risks related to their structure and focus, which include, but are not limited to, management risk, non-diversification risk, financing risk, self-liquidation risk, mortgage financing and interest rate risks, and, in many cases, relatively small market capitalization, which may result in less market liquidity and greater price volatility. REITs are also subject to the risk that the real estate market may experience an economic downturn generally, which may have a material effect on the real estate in which the REITs invest and their underlying portfolio securities. REITs are also subject to unique federal tax requirements.

Small- and Mid-Capitalization Company Risk. Smaller and mid-size companies often have a more limited track record, narrower markets, less liquidity, more limited managerial and financial resources and a less diversified product offering than larger, more established companies. As a result, their performance can be more volatile, which may increase the volatility of the Fund's portfolio.

Concentration Risk. Real estate companies may lack diversification due to ownership of a limited number of properties and concentration in a particular geographic region or property type.

Interest Rate Risk. Rising interest rates could result in higher costs of capital for real estate companies, which could negatively impact a real estate company's ability to meet its payment obligations. The Fund may face a heightened level of interest rate risk due to certain changes in monetary policy, such as interest rate changes by the Federal Reserve.

Underlying Segment Risk. The Fund will be exposed to the additional risks associated with its investments in companies of each segment of the Underlying Index.

High Dividend Yield Style Risk. While the Fund may hold securities of companies that have historically paid a high dividend yield, those companies may reduce or discontinue their dividends, thus reducing the yield of the Fund. Also, the market return of high dividend yield securities, in certain market conditions, may be worse than the market return of other investment strategies or the overall stock market.

Issuer-Specific Risk. The value of an individual security or particular type of security can be more volatile than the market as a whole and can perform differently from the value of the market as a whole.

Leverage Risk. Real estate companies may use leverage (and some may be highly leveraged), which increases investment risk and the risks normally associated with debt financing and could adversely affect a real estate company's operations and market value in periods of rising interest rates.

Liquidity Risk. Real estate is relatively illiquid and, therefore, a real estate company may have a limited ability to vary or liquidate properties in response to changes in economic or other conditions. These risks are especially applicable in conditions of declining real estate values, such as those experienced for several years starting in 2007.

Management Risk. Real estate companies are dependent upon management skills and may have limited financial resources. Real estate companies are generally not diversified and may be subject to heavy cash flow dependency, default by borrowers and self-liquidation. In addition, transactions between real estate companies and their affiliates may be subject to conflicts of interest, which may adversely affect a real estate company's shareholders.

Property Risk. Real estate companies may be subject to risks relating to functional obsolescence or reduced desirability of properties; extended vacancies; catastrophic events; and casualty or condemnation losses. Real estate income and values also may be greatly affected by demographic trends, changing tastes and values, or increasing vacancies or declining rents.

Regulatory Risk. Real estate income and values may be adversely affected by such factors as applicable domestic and foreign laws (including tax laws). Government actions, such as tax increases, zoning law changes or environmental regulations, also may have a major impact on real estate.

Repayment Risk. The prices of real estate company securities may drop because of the failure of borrowers to repay their loans, poor management, and the inability to obtain financing either on favorable terms or at all. If the properties do not generate sufficient income to meet operating expenses, ground lease payments, tenant improvements, third-party leasing commissions and other capital expenditures, the income and ability of the real estate company to make payments of interest and principal on their loans will be adversely affected.

Non-Correlation Risk. The Fund's return may not match the return of the Underlying Index for a number of reasons including operating expenses incurred by the Fund not applicable to the Underlying Index, costs in buying and selling securities, asset valuation differences and differences between the Fund's portfolio and the Underlying Index resulting from legal restrictions, cash flows or operational inefficiencies.

Depositary Receipt Risk. The Fund may invest in depositary receipts which involve similar risks to those associated with investments in foreign securities. Investments in depositary receipts may be less liquid than the underlying shares in their primary trading market and, if not included in the Underlying Index, may negatively affect the Fund's ability to replicate the performance of the Underlying Index.

Index Management Risk. Unlike many investment companies, the Fund is not "actively" managed. Therefore, it would not necessarily sell a security because the security's issuer was in financial trouble unless that security is removed from the Underlying Index.

Geographic Concentration Risk. To the extent the Underlying Index and the Fund are significantly comprised of securities of issuers from a single country, the Fund would be more likely to be impacted by events or conditions affecting that country.

Portfolio Turnover Risk. The Fund will experience increased portfolio turnover in connection with the change in the Fund's investment objective and Underlying Index and the Fund's repositioning, which will result in increased transaction costs to the Fund, including brokerage commissions, dealer mark-ups and other transaction costs on the sale of the securities and on reinvestment in other securities.

Fluctuation of Net Asset Value. The net asset value ("NAV") of the Fund's Shares will generally fluctuate with changes in the market value of the Fund's holdings. The market prices of the Shares will generally fluctuate in accordance with changes in NAV as well as the relative supply of and demand for the Shares on the NYSE Arca, Inc. (the "NYSE Arca"). The Adviser cannot predict whether the Shares will trade below, at or above their NAV.

Performance Information Illustrates Variability of Returns [Text]

rr_BarChartAndPerformanceTableHeading

FUND PERFORMANCE

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart and table provide an indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for certain time periods compare with the average annual returns of the Underlying Index and other benchmarks of market performance.

rr_PerformanceAvailabilityWebSiteAddress

www.alpsfunds.com

rr_BarChartHeading

Annual Total Returns (calendar years ended 12/31)

rr_PerformanceTableHeading

Average Annual Total Returns For the periods ended December 31, 2019

rr_PerformanceTableUsesHighestFederalRate

The after-tax returns presented in the table below are calculated using highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes.

dei_TradingSymbol

RDOG

rr_OtherExpensesOverAssets

none

rr_ExpenseExampleYear01

$ 36

rr_ExpenseExampleYear05

196

Annual Return 2010

rr_AnnualReturn2010

19.91%

Annual Return 2012

rr_AnnualReturn2012

28.92%

rr_AnnualReturn2014

14.80%

rr_AnnualReturn2016

1.74%

rr_AnnualReturn2018

(4.82%)

rr_HighestQuarterlyReturnLabel

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

18.50%

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2011

rr_AverageAnnualReturnYear01

20.46%

rr_AverageAnnualReturnYear10

8.41%

rr_ProspectusLineItems

rr_AverageAnnualReturnYear05

4.23%

rr_AverageAnnualReturnYear01

12.28%

rr_AverageAnnualReturnYear10

6.15%

rr_ProspectusLineItems

rr_AverageAnnualReturnYear05

9.22%

^[2],[8]

rr_AverageAnnualReturnYear01

21.46%

^[2]

rr_AverageAnnualReturnYear10

9.21%

^[2]

rr_ProspectusLineItems

rr_AverageAnnualReturnYear05

8.45%

^[2],[9]

rr_AverageAnnualReturnYear01

31.49%

^[2]

rr_AverageAnnualReturnYear10

13.56%

^[2]

rr_ProspectusLineItems

rr_AverageAnnualReturnYear05

6.53%

^[2]

rr_RiskReturnHeading

Summary Section BARRON'S 400SM ETF (THE "FUND")

rr_ObjectivePrimaryTextBlock

The Fund seeks investment results that correspond generally, before fees and expenses, to the performance of the Barron's 400^SM Index (ticker symbol B400) (the "Underlying Index").

rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund ("Shares"). Investors purchasing or selling Shares in the secondary market may be subject to fees and expenses (including customary brokerage commissions) charged by their broker. These fees and expenses are not included in the expense example below.

rr_PortfolioTurnoverHeading

PORTFOLIO TURNOVER

rr_PortfolioTurnoverRate

109.00%

rr_ExpenseExampleHeading

Example

rr_StrategyHeading

PRINCIPAL INVESTMENT STRATEGIES

rr_RiskHeading

PRINCIPAL INVESTMENT RISKS

rr_RiskLoseMoney

Investors should consider the following risk factors and special considerations associated with investing in the Fund, which may cause you to lose money.

rr_PerformanceNarrativeTextBlock

The following bar chart and table provide an indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for a certain time period compare with the average annual returns of the Underlying Index. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Total return figures assume reinvestment of dividends and capital gains distributions and include the effect of the Fund's recurring expenses. Updated performance information is available online at www.alpfunds.com or by calling 855.724.0450.

rr_PerformanceAvailabilityPhone

855.724.0450

rr_PerformancePastDoesNotIndicateFuture

The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.

rr_BarChartClosingTextBlock

Highest Quarterly Return	12.95%	(March 31, 2019)
Lowest Quarterly Return	-20.28%	(December 31, 2018)

The after-tax returns presented in the table below are calculated using highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your specific tax situation and may differ from those shown below. After-tax returns are not relevant to investors who hold Shares of the Fund through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.

rr_PerformanceTableUsesHighestFederalRate

The after-tax returns presented in the table below are calculated using highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes.

dei_TradingSymbol

BFOR

rr_OtherExpensesOverAssets

none

rr_ExpenseExampleYear01

$ 66

rr_ExpenseExampleYear05

362

rr_AnnualReturn2014

6.28%

rr_AnnualReturn2016

17.43%

rr_AnnualReturn2018

(13.45%)

rr_HighestQuarterlyReturnLabel

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

12.95%

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2018

rr_AverageAnnualReturnYear01

21.30%

rr_AverageAnnualReturnSinceInception

9.30%

rr_AverageAnnualReturnYear01

21.10%

rr_AverageAnnualReturnSinceInception

9.11%

rr_AverageAnnualReturnYear01

12.75%

rr_AverageAnnualReturnSinceInception

7.44%

rr_AverageAnnualReturnYear01

22.08%

^[2]

rr_AverageAnnualReturnSinceInception

10.01%

^[2]

rr_RiskReturnHeading

Summary Section ALPS MEDICAL BREAKTHROUGHS ETF (THE "FUND")

rr_ObjectivePrimaryTextBlock

The Fund seeks investment results that correspond (before fees and expenses) generally to the performance of its underlying index, the S-Network^® Medical Breakthroughs Index (ticker symbol PMBI) (the "Underlying Index").

rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund ("Shares"). Investors purchasing or selling Shares in the secondary market may be subject to fees and expenses (including customary brokerage commissions) charged by their broker. These fees and expenses are not included in the expense example below.

rr_PortfolioTurnoverHeading

PORTFOLIO TURNOVER

rr_PortfolioTurnoverRate

88.00%

rr_ExpenseExampleHeading

Example

rr_StrategyHeading

PRINCIPAL INVESTMENT STRATEGIES

rr_RiskHeading

PRINCIPAL INVESTMENT RISKS

rr_RiskLoseMoney

Investors should consider the following risk factors and special considerations associated with investing in the Fund, which may cause you to lose money.

rr_PerformanceNarrativeTextBlock

The following bar chart and table provide an indication of the risks of investing in the Fund by showing changes in the Fund's performance from year to year and by showing how the Fund's average annual returns for certain time periods compare with the average annual returns of the Underlying Index. The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future. Total return figures assume reinvestment of dividends and include the effect of the Fund's recurring expenses. Updated performance information is available online at www.alpsfunds.com or by calling 844.234.5852.

rr_PerformanceAvailabilityPhone

844.234.5852

rr_PerformancePastDoesNotIndicateFuture

The Fund's past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.

rr_BarChartClosingTextBlock

Highest Quarterly Return	33.88%	(December 31, 2019)
Lowest Quarterly Return	-30.81%	(March 31, 2016)

The after-tax returns presented in the table below are calculated using highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Your actual after-tax returns will depend on your specific tax situation and may differ from those shown below. After-tax returns are not relevant to investors who hold Shares of the Fund through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.

rr_PerformanceTableUsesHighestFederalRate

The after-tax returns presented in the table below are calculated using highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes.

dei_TradingSymbol

SBIO

rr_OtherExpensesOverAssets

none

rr_ExpenseExampleYear01

$ 51

rr_ExpenseExampleYear05

280

rr_AnnualReturn2015

28.09%

rr_AnnualReturn2017

44.91%

rr_AnnualReturn2019

49.86%

rr_BarChartHighestQuarterlyReturnDate

Dec. 31, 2019

rr_LowestQuarterlyReturnLabel

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(30.81%)

rr_AverageAnnualReturnYear05

12.31%

rr_AverageAnnualReturnInceptionDate

Dec. 30, 2014

rr_ProspectusLineItems

rr_AverageAnnualReturnYear05

11.90%

rr_AverageAnnualReturnInceptionDate

Dec. 30, 2014

rr_ProspectusLineItems

rr_AverageAnnualReturnYear05

9.62%

rr_AverageAnnualReturnInceptionDate

Dec. 30, 2014

rr_ProspectusLineItems

rr_AverageAnnualReturnYear05

12.65%

^[2]

rr_AverageAnnualReturnInceptionDate

Dec. 30, 2014

^[2]

rr_ProspectusLineItems

rr_AverageAnnualReturnYear05

4.04%

^[2]

rr_AverageAnnualReturnInceptionDate

Dec. 30, 2014

^[2]

rr_ProspectusLineItems

rr_ObjectiveHeading

INVESTMENT OBJECTIVE

rr_ExpenseHeading

FEES AND EXPENSES OF THE FUND

rr_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)

rr_PortfolioTurnoverTextBlock

The Fund will pay transaction costs, such as commissions, when it purchases and sells securities (or "turns over" its portfolio). A higher portfolio turnover will cause the Fund to incur additional 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, may affect the Fund's performance. During the most recent fiscal year ended November 30, 2019, the Fund's portfolio turnover rate was 23% of the average value of its portfolio.

rr_ExpenseExchangeTradedFundCommissions

Investors purchasing or selling Shares in the secondary market may be subject to fees and expenses (including customary brokerage commissions) charged by their broker.

rr_ExpenseExampleNarrativeTextBlock

The following example is intended to help you compare the cost of investing in the Fund with the costs of investing in other funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then hold or redeem all of your Shares at the end of those periods. The example also assumes that your investment has a 5% return, that all dividends and capital gains are reinvested each year, and that the Fund's operating expenses remain the same each year.

Although your actual costs may be higher or lower, based on these assumptions your costs would be: