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AdvisorShares Dorsey Wright FSM US Core ETF (Prospectus Summary) | AdvisorShares Dorsey Wright FSM US Core ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading ADVISORSHARES Dorsey Wright FSM US CORE ETF NASDAQ Ticker: DWUS
Objective [Heading] rr_ObjectiveHeading INVESTMENT OBJECTIVE
Objective, Secondary [Text Block] rr_ObjectiveSecondaryTextBlock

The AdvisorShares Dorsey Wright FSM US Core ETF (the “Fund”) seeks to provide long-term capital appreciation with capital preservation as a secondary objective.
Expense [Heading] rr_ExpenseHeading FUND FEES AND EXPENSES
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Most investors will incur customary brokerage commissions when buying or selling shares of the Fund, which are not reflected in the table below.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption SHAREHOLDER FEES (fees paid directly from your investment) None
Operating Expenses Caption [Text] rr_OperatingExpensesCaption ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading PORTFOLIO TURNOVER
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Total Annual Operating Expenses or in the Example, affect the Fund’s performance. This rate excludes the value of portfolio securities received or delivered as a result of in-kind creations or redemptions of the Fund’s shares. The Fund is new and does not yet have a portfolio turnover rate.
Expense Exchange Traded Fund Commissions [Text] rr_ExpenseExchangeTradedFundCommissions Most investors will incur customary brokerage commissions when buying or selling shares of the Fund, which are not reflected in the table below
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Total Annual Operating Expenses in this fee table may not correlate to the expense ratios in the Fund’s financial highlights (and the Fund’s financial statements) because the financial highlights include only the Fund’s direct operating expenses and do not include Acquired Fund Fees and Expenses, which represent the Fund’s pro rata share of the fees and expenses of the exchange-traded funds in which it invests.
Expense Example [Heading] rr_ExpenseExampleHeading EXAMPLE
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of investing in the shares of the Fund with the cost of investing in other funds. This Example does not take into account creation or redemption transaction fees, or the brokerage commissions that you pay when purchasing or selling shares of the Fund. If these fees and commissions were included, your costs would be higher.

 

The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then sell all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading PRINCIPAL INVESTMENT STRATEGIES
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Fund is an actively managed exchange-traded fund (“ETF”) that is primarily a “fund of funds.” The Advisor seeks to achieve the Fund’s investment objective by investing in ETFs that invest primarily in domestic large capitalization equity securities. During periods in which the Advisor believes the market indicates broad equity weakness and cash strength, the Fund invests in fixed income ETFs with a short or ultra-short duration, money market funds, cash and cash equivalents (“Defensive Investments”). The Fund may invest in affiliated and unaffiliated ETFs. Under normal circumstances, the Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in US investments.

 

The Advisor allocates the Fund’s portfolio investments using research obtained from the FSM Core Solution US Core Model (the “FSM US Core Model”), a proprietary model developed by Dorsey, Wright and Associates, LLC (“DWA”). The FSM US Core Model applies a proprietary ranking system based on certain technical indicators to a pre-determined universe of US large-cap ETFs, selected by DWA. Each ETF within the universe that ranks in a top tier is included in the model. If an ETF in the portfolio no longer ranks in a top tier at the time of rebalancing, then that ETF is removed and the position is allocated to a Defensive Investment.

 

The Advisor uses the FSM US Core Model to measure the relative ranking of the Fund’s core portfolio. When the model identifies broad equity weakness and cash strength, the Advisor will sell equity positions in order to allocate some or all of the portfolio to Defensive Investments. When the Fund is invested in Defensive Investments, the Advisor will shorten the Fund’s rebalancing frequency to seek to move back into equity ETF positions once the model again identifies favorable equity market conditions.

 

The Fund also may invest in repurchase agreements.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal circumstances, the Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in US investments.
Risk [Heading] rr_RiskHeading PRINCIPAL RISKS OF INVESTING IN THE FUND
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

The Fund is subject to a number of risks, described below, that may affect the value of its shares including the possible loss of money. As with any fund, there is no guarantee that the Fund will achieve its investment objective.

 

Allocation Risk. The Fund’s particular allocations may have a significant effect on the Fund’s performance. Allocation risk is the risk that the selection of ETFs and the allocation of assets among such ETFs will cause the Fund to underperform other funds with a similar investment objective that do not allocate their assets in the same manner or the market as a whole.

 

Equity Risk. The prices of equity securities rise and fall daily. These price movements may result from factors affecting individual issuers, industries or the securities market as a whole. In addition, equity markets tend to move in cycles which may cause stock prices to fall over short or extended periods of time.

 

ETF Market Risk. In stressed market conditions, the market for ETF shares may become less liquid in response to deteriorating liquidity in the markets for the ETF’s underlying portfolio holdings. This adverse effect on liquidity for the ETF’s shares in turn can lead to differences between the market price of the ETF’s shares and the underlying value of those shares.

 

Exchange-Traded Fund Risk. Through its investments in ETFs, the Fund is subject to the risks associated with the ETFs’ investments or reference assets/benchmark components, including the possibility that the value of the securities or instruments held by or linked to an ETF could decrease. These risks include any combination of the risks described below, as well as certain of the other risks described in this section. The Fund’s exposure to a particular risk will be proportionate to the Fund’s overall allocation to the ETFs and the ETFs’ asset allocation.

 

·Concentration Risk. An ETF may, at various times, concentrate in the securities of a particular industry, group of industries, or sector, and when a fund is over-weighted in an industry, group of industries, or sector, it may be more sensitive to any single economic, business, political, or regulatory occurrence than a fund that is not over-weighted in an industry, group of industries, or sector.

 

·Credit Risk. Certain of the ETFs are subject to the risk that a decline in the credit quality of a portfolio investment or reference asset could cause the ETF’s share price to fall. The ETFs could lose money if the issuer or guarantor of a portfolio investment or the counterparty to a derivatives contract fails to make timely principal or interest payments or otherwise honor its obligations.

 

·Equity Risk. The prices of equity securities rise and fall daily. These price movements may result from factors affecting individual issuers, industries or the stock market as a whole. In addition, equity markets tend to move in cycles which may cause stock prices to fall over short or extended periods of time.

 

·Fixed Income Securities Risk. An ETF’s investments in, or exposure to, fixed income securities are subject to the risk that the securities may be paid off earlier or later than expected. Either situation could cause the ETF to hold securities paying lower- than-market rates of interest, which could hurt the Fund’s yield or share price.

 

·High-Yield Risk. An ETF may invest in, or be exposed to, high-yield securities and unrated securities of similar credit quality (commonly known as “junk bonds”). High-yield securities generally pay higher yields (greater income) than investment in higher quality securities; however, high-yield securities and junk bonds may be subject to greater levels of interest rate, credit and liquidity risk than funds that do not invest in such securities, and are considered predominantly speculative with respect to an issuer’s continuing ability to make principal and interest payments.

 

·Income Risk. An ETF may derive dividend and interest income from certain of its investments. This income can vary widely over the short- and long-term. If prevailing market interest rates drop, distribution rates of an ETF’s income producing investments may decline which then may adversely affect the Fund’s value.

 

·Interest Rate Risk. An ETF’s investments in or exposure to fixed income securities are subject to the risk that interest rates rise and fall over time. As with any investment whose yield reflects current interest rates, an ETF’s yield will change over time. During periods when interest rates are low, an ETF’s yield (and total return) also may be low. To the extent that the investment advisor or issuer of an ETF anticipates interest rate trends imprecisely, the ETF could miss yield opportunities or its share price could fall.

 

·Large-Capitalization Risk. The large-cap segment of the market may underperform other segments of the equity market or the equity market as a whole. The underperformance of large-cap securities may cause the ETF’s performance to be less than expected.

 

Management Risk. The Advisor continuously evaluates the Fund’s holdings, purchases and sales with a view to achieving the Fund’s investment objective. However, achievement of the stated investment objective cannot be guaranteed. The Advisor’s judgment about the markets, the economy, or companies may not anticipate actual market movements, economic conditions or company performance, and these factors may affect the return on your investment.

 

Market Risk. Due to market conditions, the value of the Fund’s investments may fluctuate significantly from day to day. Price fluctuations may be temporary or may last for extended periods. This volatility may cause the value of your investment in the Fund to decrease. Because of its link to the markets, an investment in the Fund may be more suitable for long-term investors who can bear the risk of short-term principal fluctuations, which at times may be significant.

 

Portfolio Turnover Risk. The Fund may experience relatively high portfolio turnover, which may result in increased transaction costs and performance that is lower than expected and potentially greater tax exposure.

 

Repurchase Agreement Risk. The Fund will be subject to credit risk with respect to the counterparties with which the Fund enters into repurchase agreements, including with respect to recovering or realizing on collateral.

 

Trading Risk. Shares of the Fund may trade above or below their net asset value (“NAV”). The trading price of the Fund’s shares may deviate significantly from their NAV during periods of market volatility and, in such instances, you may pay significantly more or receive significantly less than the underlying value of the Fund’s shares. There can be no assurance that an active trading market for the Fund’s shares will develop or be maintained. In addition, trading in shares of the Fund may be halted because of market conditions or for reasons that, in the view of the NASDAQ Stock Market LLC (the “Exchange”), make trading in shares inadvisable.
Risk Lose Money [Text] rr_RiskLoseMoney The Fund is subject to a number of risks, described below, that may affect the value of its shares including the possible loss of money.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading FUND PERFORMANCE
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

A comparison of the Fund’s performance with that of a broad measure of market performance may give some indication of the risks of an investment in the Fund; however, the Fund is new and, therefore, does not have a performance history for a full calendar year. Of course, once the Fund has performance, this past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.

 

Updated performance information is available on the Fund’s website at www.advisorshares.com.
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess A comparison of the Fund’s performance with that of a broad measure of market performance may give some indication of the risks of an investment in the Fund; however, the Fund is new and, therefore, does not have a performance history for a full calendar year
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.advisorshares.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Of course, once the Fund has performance, this past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.
AdvisorShares Dorsey Wright FSM US Core ETF (Prospectus Summary) | AdvisorShares Dorsey Wright FSM US Core ETF | AdvisorShares Dorsey Wright FSM US Core ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
MANAGEMENT FEES rr_ManagementFeesOverAssets 0.75%
DISTRIBUTION (12b-1) FEES rr_DistributionAndService12b1FeesOverAssets none
OTHER EXPENSES rr_OtherExpensesOverAssets 0.24%
ACQUIRED FUND FEES AND EXPENSES rr_AcquiredFundFeesAndExpensesOverAssets 0.15% [1]
TOTAL ANNUAL OPERATING EXPENSES rr_ExpensesOverAssets 1.14%
1 YEAR rr_ExpenseExampleYear01 $ 116
3 YEARS rr_ExpenseExampleYear03 $ 362
[1] Total Annual Operating Expenses in this fee table may not correlate to the expense ratios in the Fund's financial highlights (and the Fund's financial statements) because the financial highlights include only the Fund's direct operating expenses and do not include Acquired Fund Fees and Expenses, which represent the Fund's pro rata share of the fees and expenses of the exchange-traded funds in which it invests.