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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Entity Central Index Key dei_EntityCentralIndexKey 0001408970
AdvisorShares TrimTabs Float Shrink ETF (Prospectus Summary) | AdvisorShares TrimTabs Float Shrink ETF  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading

ADVISORSHARES TRIMTABS FLOAT SHRINK ETF (NYSE Arca Ticker: TTFS)

Objective [Heading] rr_ObjectiveHeading

INVESTMENT OBJECTIVE

Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

AdvisorShares TrimTabs Float Shrink ETF (the “Fund”) seeks to generate long-term returns in excess of the total return of the Russell 3000 ® Index (the “Index”), with less volatility than the Index.

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. During the most recent fiscal year ended June 30, 2015, the Fund’s portfolio turnover rate was 52% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 52.00%
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.

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 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 seeks to achieve its investment objective by primarily investing in the broad U.S. equity market, as represented by the Index. The Fund seeks to achieve this goal by investing in stocks with liquidity and fundamental characteristics that are historically associated with superior long-term performance. Based on extensive historical research, Trim Tabs Asset Management, LLC (the “Sub-Advisor”) designed the following quantitative stock selection rules to make allocation decisions and to protect against dramatic over or under weighting of individual securities in the Fund’s portfolio.

 

Decile Ranking of Russell 3000 ® Index Stocks. The Sub-Advisor ranks stocks in the Index by decile based on the following criteria:

 

(i) the decrease in their outstanding shares over approximately the past 120 days (“float shrink”),

 

(ii) the increase in free cash flow (the money available to the company that is not used to pay for its daily operations) over approximately the past 120 days, and

 

(iii) the decrease in leverage over approximately the past 120 days. Leverage is measured as the ratio of total liabilities to total assets. The Sub-Advisor uses the relative decrease in leverage rather than amount of leverage itself as a criterion because the degree of leverage varies across industries.

 

The top decile of each respective ranking consists of the stocks of the companies with (1) the strongest reduction in shares outstanding, (2) the strongest growth in free cash flow, and (3) the largest decrease in leverage, respectively.

 

Stock Selection Algorithm. The Sub-Advisor uses an algorithm to give a relative weight to the three decile rankings, combining them in a single ranking (combined ranking). The algorithm places a higher weight on the float shrink ranking, followed by the free cash flow ranking, followed by the leverage ranking. The Fund under normal circumstances invests in 80 to 120 stocks from among the tenth percentile of stocks with the highest combined ranking.

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.

 

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.

 

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 Fund’s investments may fluctuate significantly from day to day. This volatility may cause the value of your investment in the Fund to decrease.

 

Mid-Capitalization Risk. Mid-size companies may be more volatile and more likely than large-cap companies to have limited product lines, markets or financial resources, or depend on a few key employees. Returns on investments in stocks of mid-size companies could trail the returns on investments in stocks of larger or smaller companies.

 

Small-Capitalization Risk. Security prices of small cap companies may be more volatile than those of larger companies and therefore the Fund’s share price may be more volatile than those of funds that invest a larger percentage of their assets in securities issued by larger-cap companies.

 

Trading Risk. Shares of the Fund may trade above or below their net asset value (“NAV”). The trading price of the Funds shares may deviate significantly from their NAV during periods of market volatility. 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

As with any fund, there is no guarantee that the Fund will achieve its investment objective.

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 provides an indication of the risks of investing in the Fund. The table also shows how the Fund’s performance compares to the Index, which measures the performance of the largest 3,000 U.S. companies representing approximately 98% of the investable U.S. equity market. 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 Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns

The bar chart and table that follow show how the Fund has performed on a calendar year basis and provides an indication of the risks of investing in the Fund.

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.

Bar Chart [Heading] rr_BarChartHeading

Return

Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

The Fund’s year-to-date total return as of September 30, 2015 was -4.79%.

  

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

 

 

 

 

 

 

 

 

Return

 

 

Quarter/Year

Highest Return

 

14.68

% 

 

1Q/2013

Lowest Return

 

-1.69

% 

 

2Q/2012

 

Performance Table Heading rr_PerformanceTableHeading

AVERAGE ANNUAL TOTAL RETURNS FOR THE PERIODS ENDED DECEMBER 31, 2014

Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes

Reflects no deduction for fees, expenses, or taxes

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 may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period.

AdvisorShares TrimTabs Float Shrink ETF (Prospectus Summary) | AdvisorShares TrimTabs Float Shrink ETF | Russell 3000® Index  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel

Russell 3000 ® Index (Reflects no deduction for fees, expenses, or taxes)

1 Year rr_AverageAnnualReturnYear01 12.56%
Since Inception rr_AverageAnnualReturnSinceInception 23.35%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 04, 2011
AdvisorShares TrimTabs Float Shrink ETF (Prospectus Summary) | AdvisorShares TrimTabs Float Shrink ETF | AdvisorShares TrimTabs Float Shrink ETF  
Risk/Return: rr_RiskReturnAbstract  
MANAGEMENT FEES rr_ManagementFeesOverAssets 0.99%
DISTRIBUTION (12b-1) FEES rr_DistributionAndService12b1FeesOverAssets none
OTHER EXPENSES rr_OtherExpensesOverAssets 0.12%
TOTAL ANNUAL OPERATING EXPENSES rr_ExpensesOverAssets 1.11%
FEE WAIVER/EXPENSE REIMBURSEMENT rr_FeeWaiverOrReimbursementOverAssets (0.12%) [1]
TOTAL ANNUAL OPERATING EXPENSES AFTER FEE WAIVER/EXPENSE REIMBURSEMENT rr_NetExpensesOverAssets 0.99%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

one year from the date of this Prospectus.

Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 101
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 341
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 600
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,341
Annual Return 2012 rr_AnnualReturn2012 15.50%
Annual Return 2013 rr_AnnualReturn2013 42.41%
Annual Return 2014 rr_AnnualReturn2014 14.89%
Year to Date Return, Label rr_YearToDateReturnLabel

year-to-date total return

Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2015
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (4.79%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel

Highest Return

Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2013
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 14.68%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel

Lowest Return

Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2012
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (1.69%)
Label rr_AverageAnnualReturnLabel

Return Before Taxes Based on NAV

1 Year rr_AverageAnnualReturnYear01 14.89%
Since Inception rr_AverageAnnualReturnSinceInception 26.70%
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 04, 2011
AdvisorShares TrimTabs Float Shrink ETF (Prospectus Summary) | AdvisorShares TrimTabs Float Shrink ETF | AdvisorShares TrimTabs Float Shrink ETF | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel

Return After Taxes on Distributions

[2]
1 Year rr_AverageAnnualReturnYear01 14.73% [2]
Since Inception rr_AverageAnnualReturnSinceInception 26.54% [2]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 04, 2011 [2]
AdvisorShares TrimTabs Float Shrink ETF (Prospectus Summary) | AdvisorShares TrimTabs Float Shrink ETF | AdvisorShares TrimTabs Float Shrink ETF | After Taxes on Distributions and Sales  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel

Return After Taxes on Distributions and Sale of Fund Shares

[2]
1 Year rr_AverageAnnualReturnYear01 8.57% [2]
Since Inception rr_AverageAnnualReturnSinceInception 21.47% [2]
Inception Date rr_AverageAnnualReturnInceptionDate Oct. 04, 2011 [2]
[1] 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 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 by the Advisor to be effective as of the close of business on the last day of the then-current one-year period.
[2] 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 may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period.