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AdvisorShares Madrona International ETF (Prospectus Summary) | AdvisorShares Madrona International ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading

ADVISORSHARES MADRONA INTERNATIONAL ETF

NYSE Arca Ticker: FWDI
Objective [Heading] rr_ObjectiveHeading

INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The AdvisorShares Madrona International ETF (the “Fund”) seeks to provide long-term capital appreciation above the capital appreciation of its international benchmarks, such as the MSCI EAFE Index, the Fund’s primary benchmark, and
Objective, Secondary [Text Block] rr_ObjectiveSecondaryTextBlock

the BNY Mellon Classic ADR Index, the Fund’s secondary benchmark.
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 Fund 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. During the most recent fiscal year ended June 30, 2017, the Fund’s portfolio turnover rate was 186% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 186.00%
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

Madrona Funds, LLC (the “Sub-Advisor”) seeks to achieve the Fund’s investment objective by selecting a portfolio primarily composed of American Depository Receipts (“ADRs”) from among the largest issuers of Europe, Australasia and the Far East (“EAFE”) and Canada. ADRs are U.S. traded equity securities that represent interests in securities issued by foreign publicly listed companies. The Fund’s portfolio may also include ADRs that provide exposure to the largest issuers in markets deemed to be emerging markets. The Fund also may invest in repurchase agreements.

 

Securities are selected, weighted and sold based upon the Sub-Advisor’s proprietary investment process. The Sub-Advisor’s investment committee meets on a bi-weekly basis to monitor the portfolio and make allocation decisions. The investment committee uses third-party analyst research and a proprietary fundamental process to make allocation decisions. The Fund’s strategy may frequently involve buying and selling securities, which may lead to relatively high portfolio turnover.
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, as 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.

 

American Depositary Receipt Risk. ADRs have the same currency and economic risks as the underlying non-U.S. shares they represent. They are affected by the risks associated with non-U.S. securities, such as changes in political or economic conditions of other countries, changes in the exchange rates of, or exchange control regulations associated with, foreign currencies, and differing accounting, auditing, financial reporting and legal standards and practices. In addition, investments in ADRs may be less liquid than the underlying securities in their primary trading market.

 

Currency Risk. As a result of the Fund’s investments in securities receiving revenues in, foreign currencies, the Fund will be subject to currency risk. This is the risk that currencies to which the Fund is exposed will decline in value relative to the U.S. dollar, which may cause the dollar value of an investment in the Fund to be adversely affected.

 

Emerging Markets Risk. Certain of the Fund’s investments will expose the Fund’s portfolio to the risks of investing in emerging markets. Emerging markets, which consist of countries or markets with low to middle income economies as classified by the World Bank and other countries or markets with similar characteristics as determined by the Advisor, can be subject to greater social, economic, regulatory, and political uncertainties and can be extremely volatile.

 

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.

 

Foreign Investment Risk. The Fund’s investments in securities of foreign issuers, including ADRs, may involve certain risks that are greater than those associated with investments in securities of U.S. issuers. These include risks of adverse changes in foreign economic, political, regulatory and other conditions; changes in currency exchange rates or exchange control regulations (including limitations on currency movements and exchanges); differing accounting, auditing, financial reporting and legal standards and practices; differing securities market structures; and higher transaction costs.

 

Geographic Investment Risk. To the extent that the Fund has significant investments in a particular country or region, the Fund will be susceptible to loss due to adverse market, political, regulatory, and geographic events affecting that country or region. The Fund has significant investment exposure to the countries and regions listed below.

 

Asia. While certain Asian economies are exemplars of growth and development others have been and continue to be subject, to some extent, to over-extension of credit, currency devaluations and restrictions, high unemployment, high inflation, decreased exports and economic recessions.

 

Canada. The Canadian economy is susceptible to adverse changes in certain commodities markets, including those related to the agricultural and mining industries. It is also heavily dependent on trading with key partners. Any reduction in this trading may adversely affect the Canadian economy.

 

Europe. The European economy is diverse and includes both large, competitive economies and small, struggling economies. The European economy is vulnerable to decreasing imports or exports, changes in governmental regulations on trade, changes in the exchange rate of the euro and recessions in EU economies.

 

United States. The United States is a significant trading partner of many emerging markets in which the Fund invests. The United States economy has traditionally been considered to be one of the most stable and productive economies in the world. However, the recent financial crisis, declining United States imports, new trade regulations, changes in exchange rates, and increasing public debt pose concerns for many of the United States’ trading partners that depend on its historically high levels of consumer spending and foreign investment.

 

Large-Capitalization Risk. Large-cap securities tend to go in and out of favor based on market and economic conditions. During a period when the demand for large-cap securities is less than for other types of investments — small-cap securities, for instance — the Fund’s performance could be reduced.

 

Management Risk. The Sub-Advisor continuously evaluates the Fund’s holdings, purchases and sales with a view to achieving the Fund’s investment objective. However, the achievement of the stated investment objective cannot be guaranteed. 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. 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 Fund performance that is lower than expected.

 

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 NYSE Arca, Inc. (the “Exchange”), make trading in shares inadvisable.
Risk Lose Money [Text] rr_RiskLoseMoney

The Fund is subject to a number of risks, as 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

The bar chart and table that follow show how the Fund has performed on a calendar year basis and provide an indication of the risks of investing in the Fund. The table also shows how the Fund’s performance compares to the MSCI EAFE Index and the BNY Mellon Classic ADR Index. The MSCI EAFE Index is an unmanaged free float-adjusted market capitalization index that is designed to measure the equity market performance of developed markets, excluding the United States and Canada. The BNY Mellon Classic ADR Index combines the over the counter (OTC) traded ADRs with exchange-listed ADRs bringing transparency to the available universe of American Depositary Receipts, including those issued by many of the world’s premier companies. Both the bar chart and the table assume the reinvestment of all dividends and distributions. 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 Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress

www.advisorshares.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture

Past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.
Annual Return Caption [Text] rr_AnnualReturnCaption

Calendar Year Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

The Fund’s year-to-date total return as of September 30, 2017 was 23.50%.

 

Best and Worst Quarter Returns (for the period reflected in the bar chart above)

 

  Return Quarter/Year
Highest Return 14.39% 1Q/2012
Lowest Return -16.60% 3Q/2015
Year to Date Return, Label rr_YearToDateReturnLabel

Total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2017
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 23.50%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel

Highest Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2012
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 14.39%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel

Lowest Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2015
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (16.60%)
Performance Table Heading rr_PerformanceTableHeading

AVERAGE ANNUAL TOTAL RETURNS FOR THE PERIODS ENDED DECEMBER 31, 2016
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred

Actual after-tax returns depend on your tax situation and may differ from those shown and are not relevant if you hold your shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher

In some cases the return after taxes on distributions and sale of fund shares may exceed other average annual total returns due to an assumed tax benefit from any losses on a sale of shares at the end of the measurement period.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

After-tax returns are calculated using the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on your tax situation and may differ from those shown and are not relevant if you hold your shares through tax-advantaged arrangements, such as 401(k) plans or individual retirement accounts. In some cases the return after taxes on distributions and sale of fund shares may exceed other average annual total returns due to an assumed tax benefit from any losses on a sale of shares at the end of the measurement period.
AdvisorShares Madrona International ETF (Prospectus Summary) | AdvisorShares Madrona International ETF | AdvisorShares Madrona International ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
MANAGEMENT FEES rr_ManagementFeesOverAssets 0.80%
DISTRIBUTION (12b-1) FEES rr_DistributionAndService12b1FeesOverAssets none
OTHER EXPENSES rr_OtherExpensesOverAssets 1.00%
ACQUIRED FUND FEES AND EXPENSES rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [1]
TOTAL ANNUAL OPERATING EXPENSES rr_ExpensesOverAssets 1.81%
FEE WAIVER/EXPENSE REIMBURSEMENT rr_FeeWaiverOrReimbursementOverAssets (0.55%)
TOTAL ANNUAL OPERATING EXPENSES AFTER FEE WAIVER/EXPENSE REIMBURSEMENT rr_NetExpensesOverAssets 1.26% [2]
1 YEAR rr_ExpenseExampleYear01 $ 128
3 YEARS rr_ExpenseExampleYear03 516
5 YEARS rr_ExpenseExampleYear05 929
10 YEARS rr_ExpenseExampleYear10 $ 2,081
Annual Return 2012 rr_AnnualReturn2012 19.87%
Annual Return 2013 rr_AnnualReturn2013 20.44%
Annual Return 2014 rr_AnnualReturn2014 (7.94%)
Annual Return 2015 rr_AnnualReturn2015 (6.74%)
Annual Return 2016 rr_AnnualReturn2016 5.55%
Label rr_AverageAnnualReturnLabel

Return Before Taxes Based on NAV
1 Year rr_AverageAnnualReturnYear01 5.55%
5 Years rr_AverageAnnualReturnYear05 5.52%
Since Inception rr_AverageAnnualReturnSinceInception 1.18%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 20, 2011
AdvisorShares Madrona International ETF (Prospectus Summary) | AdvisorShares Madrona International ETF | BNY Mellon Classic ADR Index [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes

Reflects no deduction for fees, expenses, or taxes
Label rr_AverageAnnualReturnLabel

BNY Mellon Classic ADR Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 3.12%
5 Years rr_AverageAnnualReturnYear05 5.57%
Since Inception rr_AverageAnnualReturnSinceInception 2.21%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 20, 2011
AdvisorShares Madrona International ETF (Prospectus Summary) | AdvisorShares Madrona International ETF | After Taxes on Distributions | AdvisorShares Madrona International ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel

Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 5.17%
5 Years rr_AverageAnnualReturnYear05 5.25%
Since Inception rr_AverageAnnualReturnSinceInception 0.93%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 20, 2011
AdvisorShares Madrona International ETF (Prospectus Summary) | AdvisorShares Madrona International ETF | After Taxes on Distributions and Sales | AdvisorShares Madrona International ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 3.70%
5 Years rr_AverageAnnualReturnYear05 4.45%
Since Inception rr_AverageAnnualReturnSinceInception 1.03%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 20, 2011
AdvisorShares Madrona International ETF (Prospectus Summary) | AdvisorShares Madrona International ETF | MSCI EAFE Index [Member]  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes

Reflects no deduction for fees, expenses, or taxes
Label rr_AverageAnnualReturnLabel

MSCI EAFE Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 1.00%
5 Years rr_AverageAnnualReturnYear05 6.53%
Since Inception rr_AverageAnnualReturnSinceInception 3.31%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 20, 2011
[1] Total Annual Operating Expenses and Total Annual Operating Expenses After Fee Waiver/Expense Reimbursement 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.
[2] AdvisorShares Investments, LLC (the "Advisor") has contractually agreed to waive its fees and/or reimburse expenses 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 at least one year from the date of this Prospectus. The expense limitation agreement may be terminated without payment of any penalty (i) by the Trust for any reason and at any time and (ii) by the Advisor, for any reason, upon ninety (90) days' prior written notice to the Trust, such termination to be effective as of the close of business on the last day of the then-current one-year period.