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AdvisorShares KIM Korea Equity ETF (Prospectus Summary) | AdvisorShares KIM Korea Equity ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading

ADVISORSHARES KIM KOREA EQUITY ETF

NYSE Arca Ticker: KOR
Objective [Heading] rr_ObjectiveHeading

INVESTMENT OBJECTIVE
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The AdvisorShares KIM Korea Equity ETF (the “Fund”) seeks to provide long-term capital appreciation above the capital appreciation of its primary benchmark, the MSCI Korea Index, and other Korea-focused indexes.
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 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. During the most recent fiscal year ended June 30, 2017, the Fund’s portfolio turnover rate was 69% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 69.00%
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

The Fund seeks to achieve its investment objective by investing primarily in growth-oriented stocks of any capitalization range listed on the Korea Exchange. Under normal circumstances, the Fund will invest at least 80% of its net assets (plus any borrowings for investment purposes) in equity securities listed on the Korea Exchange. Companies in the information technology sector have significant representation on the Korea Exchange.

 

 

The Fund’s sub-advisor, Korea Investment Management Co., Ltd. (the “Sub-Advisor”), manages the Fund’s portfolio by buying and holding stocks of companies at attractive valuation that it believes have growth potential. When selecting stocks of companies that it believes have growth potential, the Sub-Advisor considers a number of factors including a company’s annual sales growth with sustained profit margins; annual earnings per share growth; and anticipated sales or earnings per share growth. The Sub-Advisor focuses on corporate fundamental research in its stock selection, often called “bottom up” analysis. The Sub-Advisor will invest the Fund’s assets with a mid- to long-term view, typically seeking to avoid short-term trading. In selecting investments for the Fund’s portfolio, the Sub-Advisor places emphasis on fundamentals rather than on short-term momentum and continuously monitors market risks. In deciding whether to sell investments in the Fund’s portfolio, the Sub-Advisor considers the following factors:  a company’s stock price reaches its target price; a company in the portfolio experiences negative fundamental changes; errors are found in the previous assumptions or forecasts of a company; and more profitable alternatives are found.

 

In addition to individual stock selection, the Sub-Advisor engages in sector allocation based on analysis of the macro economy and its effect on corporate competitiveness and industry cycles. This is often called “top down” analysis. The Sub-Advisor strives to invest with large economic cycles as compared to short-term market trends and short-term supply and demand.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration

Under normal circumstances, the Fund will invest at least 80% of its net assets (plus any borrowings for investment purposes) in equity securities listed on the Korea Exchange.
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.

 

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. 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 Sub-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 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.

 

Foreign Investment Risk. The Fund’s investments in securities of foreign issuers 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.

 

South Korea. Economic and political developments of South Korean neighbors may have an adverse effect on the South Korean economy. Substantial political tensions exist between North Korea and South Korea and, recently, these political tensions have escalated. In addition, South Korea's economic growth potential has recently been on a decline. South Korea's economic growth potential is susceptible to problems from large scale emigration, rigid labor regulations and ongoing labor relations issues.

 

Growth Investing Risk. The Fund pursues a growth style of investing. Growth stocks can be volatile for several reasons. Since those companies usually invest a high portion of earnings in their businesses, they may lack the dividends of value stocks that can cushion stock prices in a falling market. The prices of growth stocks are based largely on projections of the issuer’s future earnings and revenues. If a company’s earnings or revenues fall short of expectations, its stock price may fall dramatically.

 

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.

 

Information Technology Sector Risk. Market or economic factors impacting technology companies and companies that rely heavily on technological advances could have a major effect on the value of the Fund's investments. Stocks of technology companies and companies that rely heavily on technology, especially those of smaller, less-seasoned companies, tend to be more volatile than the overall market. Additionally, companies in the technology sector may face dramatic and often unpredictable changes in growth rates and competition for the services of qualified personnel.

 

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 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

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 KIM Korea Equity ETF (Prospectus Summary) | AdvisorShares KIM Korea Equity ETF | AdvisorShares KIM Korea Equity ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
MANAGEMENT FEES rr_ManagementFeesOverAssets 0.84%
DISTRIBUTION (12b-1) FEES rr_DistributionAndService12b1FeesOverAssets none
OTHER EXPENSES rr_OtherExpensesOverAssets 1.53%
TOTAL ANNUAL OPERATING EXPENSES rr_ExpensesOverAssets 2.37%
FEE WAIVER/EXPENSE REIMBURSEMENT rr_FeeWaiverOrReimbursementOverAssets (1.38%) [1]
TOTAL ANNUAL OPERATING EXPENSES AFTER FEE WAIVER/EXPENSE REIMBURSEMENT rr_NetExpensesOverAssets 0.99%
1 YEAR rr_ExpenseExampleYear01 $ 101
3 YEARS rr_ExpenseExampleYear03 607
5 YEARS rr_ExpenseExampleYear05 1,140
10 YEARS rr_ExpenseExampleYear10 $ 2,600
[1] 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 0.99% 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.