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Entity Central Index Key dei_EntityCentralIndexKey 0001408970
AdvisorShares Treesdale Rising Rates ETF (Prospectus Summary) | AdvisorShares Treesdale Rising Rates ETF
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

ADVISORSHARES TREESDALE RISING RATES ETF (NYSE Arca Ticker: HDGB)
Objective [Heading] rr_ObjectiveHeading

INVESTMENT OBJECTIVES
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The AdvisorShares Treesdale Rising Rates ETF seeks to generate current income while providing protection in a rising interest rate environment.
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 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 Fund 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.

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.
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates

Because the Fund is new, “Other Expenses” are based on estimated amounts for the current fiscal year.

Expense Example [Heading] rr_ExpenseExampleHeading

EXAMPLE
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of investing in the 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 the 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 seeks to achieve its investment objectives by primarily taking positions in mortgage-related products with interest-only cash flows while managing duration risk with liquid interest rate products. To employ the Fund's strategy, Treesdale Partners, LLC (the “Sub-Advisor”) seeks to generate enhanced returns in an environment of rising interest rates by investing principally in agency interest-only mortgage-backed securities, interest-only swaps and certain other mortgage-related derivative instruments, while maintaining a negative portfolio duration with a generally positive current yield by investing in U.S. Treasury obligations and other liquid rate instruments. The mortgage-related instruments in which the Fund invests are intended to provide significant negative duration exposure and will generally benefit from rising interest rates. The overall duration of the Fund's fixed income investments will range from -5 to -15 years. Duration is a measure used to determine the sensitivity of a security's price to changes in interest rates. The longer a security's duration, the more sensitive it will be to changes in interest rates.  A portfolio with negative duration generally incurs a loss when interest rates and yields fall.  To counter the impact of such potential losses, the Fund's negative duration will be partly offset with long positions in U.S. Treasury obligations, interest rate swaps and other positive duration products.

 

In determining the Fund's investment allocations, the Sub-Advisor will perform both top-down and security specific analysis. The overall negative duration target and allocation to specific subsectors of the mortgage interest-only and derivatives markets are based on high-level macro and relative value analysis across fixed income markets. Using these targets, allocations to individual positions are made based on detailed value analysis. Liquid U.S. Treasury obligations and interest rate swaps are used to adjust the portfolio to certain negative duration targets. While the U.S. Treasury and rate swap hedges will be rebalanced daily, the core mortgage portfolio will be less frequently rebalanced.

 

To mitigate idiosyncratic prepayment risks and other dimensions of bond risk, the Sub-Advisor seeks to diversify the Fund's portfolio. To hedge against the risk of a large downward move in interest rates, the Sub-Advisor may also purchase options on interest rates.
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 that may affect the value of its shares, including:

 

Counterparty Risk. The Fund may invest in financial instruments involving counterparties that attempt to gain exposure to a particular group of securities, index or asset class without actually purchasing those securities or investments, or to hedge a position. The Fund's use of such financial instruments, including swap agreements and structured notes, involves risks that are different from those associated with ordinary portfolio securities transactions. For example, if a swap agreement counterparty defaults on its payment obligations to the Fund, this default will cause the value of your investment in the Fund to decrease.

 

Credit Risk. The Fund could lose money if the issuer or guarantor of a debt instrument in which the Fund invests becomes unwilling or unable to make timely principal and/or interest payments, or to otherwise meet its obligations.

 

Derivatives Risk. Derivatives may be riskier than other types of investments because they may be more sensitive to changes in economic or market conditions than other types of investments and could result in losses that significantly exceed the Fund's original investment. A derivative is a financial contract the value of which depends on, or is derived from, the value of a financial asset (such as stock, bond or currency), a physical asset (such as gold) or a market index (such as the S&P 500 Index). Many derivatives create leverage thereby causing the Fund to be more volatile than it would be if it had not invested in derivatives. Derivatives also expose the Fund to counterparty risk (the risk that the derivative counterparty will not fulfill its contractual obligations) and to credit risk.

 

Early Closing Risk.  An unanticipated early closing of the NYSE Arca, Inc. (the “Exchange”) may result in a shareholder's inability to buy or sell shares of the Fund on that day.

 

Fixed Income Securities Risk. The market value of fixed income investments in which the Fund may invest may change in response to interest rate changes and other factors. During periods of falling interest rates, the value of outstanding fixed income securities generally rise. Conversely, during periods of rising interest rates, the value of fixed income securities generally decline.

 

Income Risk. The income from the Fund's investments may decline because of falling market interest rates. This can result when the Fund invests the proceeds from new share sales, or from matured or called bonds, at market interest rates that are below the Fund portfolio's current earnings rate.

 

Interest Rate Risk. The Fund's investment in fixed income securities will change in value in response to interest rate changes and other factors, such as the perception of the issuer's creditworthiness.

 

Issuer Risk. The value of a security may increase for a number of reasons which directly relate to the issuer, such as management performance, improved financial condition and increased demand of the issuer's goods or services. An increase in the value of the securities of an issuer or guarantor of a debt instrument may cause the value of your investment in the Fund to decrease.

 

Liquidity Risk. Trading in shares of the Fund may be halted because of market conditions or for reasons that, in the view of the Exchange, make trading in shares inadvisable. A particular investment may be difficult to purchase or sell, and the Fund may be unable to sell illiquid securities (for example, certain swap agreements) at an advantageous time or price or achieve its desired level of exposure to a certain section.

 

Management Risk. The Sub-Advisor continuously evaluates the Fund's holdings, purchases and sales with a view to achieving the Fund's investment objectives. However, the achievement of the stated investment objectives cannot be guaranteed over short- or long-term market cycles. The Sub-Advisor's judgments about the markets, the economy, or companies may not anticipate actual market movements, economic conditions or company performance, and these judgments 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.

  

Mortgage-Backed and Asset-Backed Securities Risk. The risk that the impairment of the value of collateral underlying a mortgage-backed or asset-backed security, such as due to non-payment of loans, will result in a reduction in the value of such security.

 

Options Risk. Writing and purchasing call and put options are highly specialized activities and entail greater than ordinary investment risks. The value of the Fund's positions in options fluctuates in response to changes in the value of the underlying security. The Fund also risks losing all or part of the cash paid for purchasing call and put options. Fund assets covering written options cannot be sold while the option is outstanding, unless replaced with similar assets. As a result, there is a possibility that segregation of a large percentage of the Fund's assets could affect its portfolio management as well as the ability of the Fund to meet other current obligations.

 

Prepayment Risk. The Fund may invest in mortgage related securities, which, like other debt securities, may be paid off early when the issuer of a debt security can repay the principal prior to a security's maturity. If interest rates are falling, the Fund may have to reinvest the unanticipated proceeds at lower interest rates, resulting in a decline in the Fund's income.

 

Trading Risk. Shares of the Fund may trade below their net asset value (“NAV”). The NAV of shares will fluctuate with changes in the market value of the Fund's holdings. In addition, although the Fund's shares are currently listed on the Exchange, there can be no assurance that an active trading market for shares will develop or be maintained.

 

U.S. Government Securities Risk. The Fund may invest in U.S. government securities, which are subject to price fluctuations and to default in the event that an agency or instrumentality defaults on an obligation not backed by the full faith and credit of the United States.

 

As with any fund, there is no guarantee that the Fund will achieve its investment objectives.
Risk Lose Money [Text] rr_RiskLoseMoney As with any fund, there is no guarantee that the Fund will achieve its investment objectives.
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 Treesdale Rising Rates ETF (Prospectus Summary) | AdvisorShares Treesdale Rising Rates ETF | AdvisorShares Treesdale Rising Rates ETF
  
Risk/Return: rr_RiskReturnAbstract  
MANAGEMENT FEES rr_ManagementFeesOverAssets 1.15%
DISTRIBUTION (12b-1) FEES rr_DistributionAndService12b1FeesOverAssets none
OTHER EXPENSES rr_Component1OtherExpensesOverAssets 0.45% [1]
TOTAL ANNUAL FUND OPERATING EXPENSES rr_ExpensesOverAssets 1.60%
FEE WAIVER AND/OR EXPENSE REIMBURSEMENT rr_FeeWaiverOrReimbursementOverAssets 0.35% [2]
TOTAL ANNUAL FUND OPERATING EXPENSES AFTER FEE WAIVER AND/OR EXPENSE REIMBURSEMENT rr_NetExpensesOverAssets 1.25%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 127
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 $ 470
[1] Because the Fund is new, 'Other Expenses' are based on estimated amounts for the current fiscal year.
[2] AdvisorShares Investments, LLC (the 'Advisor') has contractually agreed to reduce its fees and/or reimburse expenses in order to keep net expenses (excluding amounts payable pursuant to any plan adopted in accordance with Rule 12b-1, interest expense, taxes, brokerage commissions, Acquired Fund Fees and Expenses, other expenditures which are capitalized in accordance with generally accepted accounting principles, and extraordinary expenses) from exceeding 1.25% of the Fund's average daily net assets for a year from the date of this Prospectus and for an indefinite period thereafter subject to annual approval by the AdvisorShares Trust Board of Trustees (the 'Board'). The expense limitation agreement (i) may be terminated at any time by the Board and (ii) will be terminated upon termination of the investment advisory agreement between the Advisor and the Fund.