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TrimTabs All Cap U.S. Free-Cash-Flow ETF  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading TrimTabs All Cap U.S. Free-Cash-Flow ETF
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The TrimTabs All Cap U.S. Free-Cash-Flow ETF (formerly known as the 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 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. You may also pay brokerage commissions on the purchase and sale of Shares.
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 may pay transaction costs, including 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 Shares are held in a taxable account. These costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. For the fiscal period September 27, 2016 (commencement of operations) through July 31, 2017, the Fund’s portfolio turnover rate was 63% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 63.00%
Expense Exchange Traded Fund Commissions [Text] rr_ExpenseExchangeTradedFundCommissions You may also pay brokerage commissions on the purchase and sale of Shares.
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. The example assumes that you invest $10,000 for the time periods indicated and then redeem all of your Shares at the end of those periods. The example also assumes that the Fund provides a return of 5% a year and that operating expenses remain the same. The example does not reflect any brokerage commissions that you may pay on purchases and sales of Shares.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption 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, TrimTabs Asset Management, LLC (the “Adviser”) 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 Rankings of Index Stocks. The Adviser ranks stocks in the Index by decile (i.e., top 10%, top 20%, top 30%, etc.) based on the following criteria:

(i) the relative decrease in their outstanding shares (“float shrink”) over approximately the past six months;

(ii) the relative increase in their free cash flow (the money available to the company that is not used to pay for its daily operations) over approximately the past six months; and

(iii) the relative decrease in their leverage over approximately the past six months. Leverage is measured as the ratio of total liabilities to total assets. The Adviser 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 stocks ranked represent the companies with (1) the largest reduction in shares outstanding, (2) the strongest growth in free cash flow, and (3) the largest decrease in leverage, respectively.

Stock Selection Algorithm. The Adviser uses a mathematical formula, known as an “algorithm,” to combine the three rankings into a single ranking for each stock ranked (“combined ranking”). The algorithm generally places a higher weight on the float shrink ranking, followed by the free cash flow ranking, and then the leverage ranking. The Fund then normally invests equally in 80 to 120 stocks in the top 10% of stocks based on their combined ranking, subject to the Adviser’s determination that each stock is sufficiently liquid and the Adviser’s discretion to adjust allocations.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
An investment in the Fund involves risk, including those described below. There is no assurance that the Fund will achieve its investment objective. An investor may lose money by investing in the Fund.

Equity Investing Risk. An investment in the Fund involves risks similar to those of investing in any fund holding equity securities, such as market fluctuations, changes in interest rates and perceived trends in stock prices. The values of equity securities could decline generally or could underperform other investments. In addition, securities may decline in value due to factors affecting a specific issuer, market or securities markets generally.

ETF Risk. As an ETF, the Fund is subject to the following risks:

Authorized Participants Concentration Risk. The Fund may have a limited number of financial institutions that may act as Authorized Participants (“APs”). To the extent that those APs exit the business or are unable to process creation and/or redemption orders, Shares may trade at a discount to net asset value (or “NAV”).

Flash Crash Risk. Sharp price declines in securities owned by the Fund may trigger trading halts, which may result in the Fund’s shares trading in the market at an increasingly large discount to NAV during part (or all) of a trading day.

Large Shareholder Risk. Certain shareholders, including the Adviser or an affiliate of the Adviser, may own a substantial amount of the Fund’s Shares. Redemptions by large shareholders could have a significant negative impact on the Fund. In addition, transactions by large shareholders may account for a large percentage of the trading volume on the Exchange and may, therefore, have a material upward or downward effect on the market price of the Shares.

Premium-Discount Risk. Shares may trade above or below their NAV. Accordingly, investors may pay more than NAV when purchasing Shares or receive less than NAV when selling Shares.  The market prices of Shares will generally fluctuate in accordance with changes in NAV, changes in the relative supply of, and demand for, Shares, and changes in the liquidity, or the perceived liquidity, of the Fund’s holdings.

Secondary Market Trading Risk. Investors buying or selling Shares in the secondary market may pay brokerage commissions or other charges, which may be a significant proportional cost for investors seeking to buy or sell relatively small amounts of Shares. Although the Shares are listed on the Exchange, there can be no assurance that an active or liquid trading market for them will develop or be maintained. In addition, trading in Shares on the Exchange may be halted.

Investment Risk. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. When you sell your Shares, they could be worth less than what you paid for them.

Large Capitalization Company Risk. The Fund’s investments in large capitalization companies may underperform other segments of the market because they may be less responsive to competitive challenges and opportunities and unable to attain high growth rates during periods of economic expansion.

Management Risk.  The Fund is actively managed using proprietary investment strategies and processes.  There can be no guarantee that the Fund will achieve its investment objective.  This could result in the Fund underperforming comparable investment vehicles.

Market Events Risk. Turbulence in the financial markets and reduced liquidity in the equity markets may negatively affect issuers, which could have an adverse effect on the Fund. In addition, there is a risk that policy changes by the U.S. Government and/or Federal Reserve, such as increasing interest rates, could cause increased volatility in financial markets and higher levels of Fund redemptions, which could have a negative impact on the Fund.

Sector Concentration Risk. To the extent that the Fund’s investments are focused on a particular industry or group of industries or sector, the Fund is subject to loss due to adverse occurrences that may affect that industry or group of industries or sector. Focusing on a particular industry or group of industries could increase the Fund’s volatility over the short term.

Small and Medium Capitalization Company Risk. Investing in securities of small and medium capitalization companies involves greater risk than customarily is associated with investing in larger, more established companies. These companies’ securities may be more volatile and less liquid than those of more established companies. Often, small and medium capitalization companies and the industries in which they focus are still evolving and, as a result, they may be more sensitive to changing market conditions.
Risk Lose Money [Text] rr_RiskLoseMoney An investor may lose money by investing in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
Performance information will be available in the Prospectus after the Fund has been in operation for one full calendar year. When provided, the information will provide some indication of the risks of investing in the Fund by showing how the Fund’s average annual returns compare with a broad measure of market performance. Past performance does not necessarily indicate how the Fund will perform in the future. Updated performance information will be available at www.trimtabsfunds.com.
Performance One Year or Less [Text] rr_PerformanceOneYearOrLess Performance information will be available in the Prospectus after the Fund has been in operation for one full calendar year.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.trimtabsfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance does not necessarily indicate how the Fund will perform in the future.
TrimTabs All Cap U.S. Free-Cash-Flow ETF | TrimTabs All Cap U.S. Free-Cash-Flow ETF  
Risk/Return: rr_RiskReturnAbstract  
Management Fee rr_ManagementFeesOverAssets 0.59%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none [1]
Other Expenses rr_OtherExpensesOverAssets none
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.59%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 60
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 189
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 329
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 738
[1] Pursuant to a Rule 12b-1 Distribution and Service Plan (the "Plan"), the Fund may bear a Rule 12b-1 fee not to exceed 0.25% per year of the Fund's average daily net assets. However, no such fee is currently paid by the Fund and the Board of Trustees has not currently approved the commencement of any payments under the Plan.