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Label Element Value
Prospectus [Line Items] rr_ProspectusLineItems  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Jul. 31, 2019
Entity Registrant Name dei_EntityRegistrantName TrimTabs ETF Trust
Entity Central Index Key dei_EntityCentralIndexKey 0001604813
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Nov. 27, 2019
Document Effective Date dei_DocumentEffectiveDate Nov. 29, 2019
Prospectus Date rr_ProspectusDate Nov. 29, 2019
Entity Inv Company Type dei_EntityInvCompanyType N-1A
TrimTabs All Cap International Free-Cash-Flow ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading TrimTabs All Cap International Free-Cash-Flow ETF
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The TrimTabs All Cap International Free-Cash-Flow ETF (the “Fund”) seeks to generate long-term returns in excess of the total return of the S&P Developed ex-U.S. BMI® Index (the “Index”), with similar volatility to that 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, which are not reflected in the table or example below.
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 year ended July 31, 2019, the Fund’s portfolio turnover rate was 43% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 43.00%
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”). To pursue its investment objective, the Fund invests, under normal market circumstances, at least 80% of its net assets (plus any borrowings for investment purposes) in equity securities of companies from foreign countries, or depositary receipts representing such securities. The Fund considers an issuer to be from a foreign country if: (i) its securities are organized under the laws of a foreign country or the issuer maintains its principal place of business in a foreign country; (ii) its securities are traded principally in a foreign country; or (iii) during the issuer's most recent fiscal year, it derived at least 50% of its revenues or profits from goods produced or sold, investments made, or services performed in a foreign country or has at least 50% of its assets in a foreign country. The companies in which the Fund primarily invests are those with listed issuers in the Index, which includes only companies from developed foreign markets from Europe, Japan and the Asia-Pacific region. The Fund seeks to invest in stocks of any market capitalization that have fundamental characteristics, which TrimTabs Asset Management, LLC (the “Adviser”) believes are associated with superior long-term performance, based on the extensive historical research of the Adviser.
The Adviser designed the following quantitative stock selection rules to make allocation decisions and to seek 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:
(1)the relative decrease in their outstanding shares over approximately the past six months;
(2)the relative increase in their free cash flow (i.e., the money available to the company that is not used to pay for its daily operations) over approximately the past six months; and
(3)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 (“combined ranking”).
The relative weight the algorithm gives to each factor essentially varies according to the degree of change of each of these factors for each individual company during the measurement period.
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.
From time to time the Fund may focus its investment (i.e., invest more than 15% of its total assets) in one or more particular sector or geographic region.
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.
Foreign Investment Risk. Returns on investments in foreign securities could be more volatile than, or trail the returns on, investments in U.S. securities. Exposures to foreign securities entail special risks, including due to: differences in information available about foreign issuers; differences in investor protection standards in other jurisdictions; capital controls risks, including the risk of a foreign jurisdiction imposing restrictions on the ability to repatriate or transfer currency or other assets; political, diplomatic and economic risks; regulatory risks; and foreign market and trading risks, including the costs of trading and risks of settlement in foreign jurisdictions. In addition, the Fund’s investments in securities denominated in other currencies could decline due to changes in local currency relative to the value of the U.S. dollar, which may affect the Fund’s returns.
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.
Geographic Region Risk. To the extent that the Fund invests a significant portion of its assets in a specific geographic region or a particular country, the Fund will generally have more exposure to that region or country’s economic risks. In the event of economic or political turmoil or a deterioration of diplomatic relations in a region or country where a significant portion of the Fund’s assets are invested, the Fund may experience substantial illiquidity or reduction in the value of the Fund’s investments. Adverse conditions in a certain region or country can also adversely affect securities of issuers in other countries whose economies appear to be unrelated.
Asia-Pacific Risk. Investments in securities of issuers in Asia-Pacific countries involve risks that are specific to the Asia-Pacific region, including certain legal, regulatory, political and economic risks. Certain Asia-Pacific countries have experienced expropriation and/or nationalization of assets, confiscatory taxation, political instability, armed conflict and social instability as a result of religious, ethnic, socio-economic and/or political unrest. Some economies in this region are dependent on a range of commodities, and are strongly affected by international commodity prices and particularly vulnerable to price changes for these products. The market for securities in this region may also be directly influenced by the flow of international capital, and by the economic and market conditions of neighboring countries. Many Asia-Pacific economies have experienced rapid growth and industrialization, and there is no assurance that this growth rate will be maintained. Some Asia-Pacific economies are highly dependent on trade and economic conditions in other countries can impact these economies.
•
Japan Risk. The Japanese economy may be subject to considerable degrees of economic, political and social instability. Since 2000, Japan’s economic growth rate has remained relatively low. In addition, Japan is subject to the risk of natural disasters, such as earthquakes and tsunamis.
Europe Risk. Decreasing imports or exports, changes in governmental or European Union (the “EU”) regulations on trade, changes in the exchange rate of the euro, the default or threat of default by an EU member country on its sovereign debt, and/or an economic recession in an EU member country may have a significant adverse effect on the securities of EU issuers. The European financial markets have recently experienced volatility and adversity due to concerns about withdrawal of member countries from the EU and economic downturns and rising government debt levels in several European countries. These events have adversely affected the exchange rate of the euro and may continue to significantly affect every country in Europe.
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.
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. Small and medium capitalization companies may be particularly affected by interest rate increases, as they may find it more difficult to borrow money to continue or expand operations or may have difficulty in repaying any loans which are floating rate.
Depositary Receipts Risk. The risks of investments in depositary receipts are substantially similar to Foreign Investment Risks. In addition, depositary receipts may not track the price of the underlying foreign securities, and their value may change materially at times when the U.S. markets are not open for trading.
Management Risk. The Fund is actively managed using proprietary investment strategies and processes that are based on quantitative stock selection rules and algorithms (the "quantitative investment process"). There can be no guarantee that the Fund will achieve its investment objective or that the quantitative investment process will produce the intended results. The Fund may be adversely affected by imperfections, errors or limitations in the construction or implementation of the quantitative investment process and/or the Adviser's ability to monitor and timely adjust the metrics or update the data or features underlying the quantitative investment process. Any of these factors 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.
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”) and possibly face delisting.
•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. Shareholders could suffer significant losses to the extent that they sell Shares at these temporarily low market prices.
•International Closed Markets Trading Risk. Because certain of the Fund’s investments trade in markets that are closed when the Fund and Exchange are open, there are likely to be deviations between the current prices of such investments and the prices at which such investments are marked for purposes of the Fund’s Intraday Indicative Value (“IIV”). As a result, Shares may appear to trade at a significant discount or premium to NAV.
•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.
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
The following performance information indicates some of the risks of investing in the Fund. The bar chart shows the Fund’s performance for the calendar year ended December 31, 2018. The table illustrates how the Fund’s average annual returns for the 1-year and since inception periods compare with those of a broad measure of market performance. The Fund’s past performance, before and after taxes, does not necessarily indicate how it will perform in the future. Updated performance information is also available on the Fund’s website at www.trimtabsfunds.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information indicates some of the risks of investing in the Fund.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.trimtabsfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance, before and after taxes, does not necessarily indicate how it will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
For the year-to-date period ended September 30, 2019, the Fund’s total return was 16.26%. During the period of time shown in the bar chart, the Fund’s highest quarterly return was 0.36% for the quarter ended June 30, 2018, and the lowest quarterly return was -15.61% for the quarter ended December 31, 2018.
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2019
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 16.26%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2018
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 0.36%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (15.61%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns For the Period Ended December 31, 2018
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 historical highest individual federal marginal income tax rates during the period covered by the table above 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 an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Shares through tax-deferred arrangements such as an individual retirement account (“IRA”) or other tax-advantaged accounts.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher The “Return After Taxes on Distributions and Sale of Fund Shares” may be higher than other return figures because when a capital loss occurs upon redemption of portfolio shares, a tax deduction is provided that benefits the investor.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates during the period covered by the table above and do not reflect the impact of state and local taxes. The “Return After Taxes on Distributions and Sale of Fund Shares” may be higher than other return figures because when a capital loss occurs upon redemption of portfolio shares, a tax deduction is provided that benefits the investor. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Shares through tax-deferred arrangements such as an individual retirement account (“IRA”) or other tax-advantaged accounts.
TrimTabs All Cap International Free-Cash-Flow ETF | S&P Developed ex-U.S. BMI® Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel S&P Developed ex-U.S. BMI® Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 (14.83%)
Since Inception rr_AverageAnnualReturnSinceInception (3.97%)
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 27, 2017
TrimTabs All Cap International Free-Cash-Flow ETF | TrimTabs All Cap International Free-Cash-Flow ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol TTAI
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.59% [1]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets none
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.02%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.61%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 62
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 195
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 340
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 762
Annual Return 2018 rr_AnnualReturn2018 (16.77%)
Label rr_AverageAnnualReturnLabel TrimTabs All Cap International Free-Cash-Flow ETF Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (16.77%)
Since Inception rr_AverageAnnualReturnSinceInception (6.75%)
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 27, 2017
TrimTabs All Cap International Free-Cash-Flow ETF | TrimTabs All Cap International Free-Cash-Flow ETF | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel TrimTabs All Cap International Free-Cash-Flow ETF Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 (16.78%)
Since Inception rr_AverageAnnualReturnSinceInception (6.79%)
TrimTabs All Cap International Free-Cash-Flow ETF | TrimTabs All Cap International Free-Cash-Flow ETF | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel TrimTabs All Cap International Free-Cash-Flow ETF Return After Taxes on Distributions and Sale of Shares
1 Year rr_AverageAnnualReturnYear01 (9.62%)
Since Inception rr_AverageAnnualReturnSinceInception (4.98%)
TrimTabs All Cap U.S. Free-Cash-Flow ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
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 (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, which are not reflected in the table or example below.
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 year ended July 31, 2019, the Fund’s portfolio turnover rate was 49% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 49.00%
Expense Exchange Traded Fund Commissions [Text] rr_ExpenseExchangeTradedFundCommissions You may also pay brokerage commissions on the purchase and sale of Shares, which are not reflected in the table or example below.
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”). To pursue its investment objective, the Fund invests, under normal market circumstances, at least 80% of its net assets (plus any borrowings for investment purposes) in equity securities of companies from the United States. The Fund considers an issuer to be from the United States if: (i) its securities are organized under the laws of the United States or the issuer maintains its principal place of business in the United States; (ii) its securities are traded principally in the United States; or (iii) during the issuer's most recent fiscal year, it derived at least 50% of its revenues or profits from goods produced or sold, investments made, or services performed in the United States or has at least 50% of its assets in the United States. The Fund seeks to invest in stocks of any market capitalization that have fundamental characteristics, which TrimTabs Asset Management, LLC (the “Adviser”) believes are associated with superior long-term performance, based on the extensive historical research of the Adviser.
The Adviser designed the following quantitative stock selection rules to make allocation decisions and to seek 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 over approximately the past six months;
(ii)the relative increase in their free cash flow (i.e., 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 (“combined ranking”).
The relative weight the algorithm gives to each factor essentially varies according to the degree of change of each of these factors for each individual company during the measurement period.
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.
From time to time the Fund may focus its investment (i.e., invest more than 15% of its total assets) in one or more particular sectors. As of the date of this prospectus, the Fund currently focuses its investments in the consumer discretionary, financials and information technology sectors.
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.
Geographic Region Risk. Because the Fund invests a significant portion of its assets in the U.S., the Fund will generally have more exposure to economic risks affecting the U.S. In the event of economic or political turmoil or a deterioration of diplomatic relations in the U.S., the Fund may experience substantial illiquidity or reduction in the value of the Fund’s investments. Adverse conditions in other countries whose economies appear to be unrelated can also adversely affect the Fund’s U.S. investments.
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.
Sector Focus 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 sector or group of industries or sector. Focusing on a particular sector or group of industries could increase the Fund’s volatility over the short term.
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.
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. Small and medium capitalization companies may be particularly affected by interest rate increases, as they may find it more difficult to borrow money to continue or expand operations, or may have difficulty in repaying any loans which are floating rate.
Management Risk. The Fund is actively managed using proprietary investment strategies and processes that are based on quantitative stock selection rules and algorithms (the "quantitative investment process"). There can be no guarantee that the Fund will achieve its investment objective or that the quantitative investment process will produce the intended results. The Fund may be adversely affected by imperfections, errors or limitations in the construction or implementation of the quantitative investment process and/or the Adviser's ability to monitor and timely adjust the metrics or update the data or features underlying the quantitative investment process. Any of these factors 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.
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”) and possibly face delisting.
•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. Shareholders could suffer significant losses to the extent that they sell Shares at these temporarily low market prices.
•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.
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
The following performance information indicates some of the risks of investing in the Fund. The bar chart shows the Fund’s performance for the calendar year ended December 31, 2018. The table illustrates how the Fund’s average annual returns for the 1-year and since inception periods compare with those of a broad measure of market performance. The Fund’s past performance, before and after taxes, does not necessarily indicate how it will perform in the future. Updated performance information is also available on the Fund’s website at www.trimtabsfunds.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information indicates some of the risks of investing in the Fund.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.trimtabsfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance, before and after taxes, does not necessarily indicate how it will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Returns
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
For the year-to-date period ended September 30, 2019, the Fund’s total return was 17.99%. During the period of time shown in the bar chart, the Fund’s highest quarterly return was 8.58% for the quarter ended December 31, 2017, and the lowest quarterly return was -16.97% for the quarter ended December 31, 2018.
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2019
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 17.99%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest quarterly return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2017
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 8.58%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest quarterly return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (16.97%)
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns For the Period Ended December 31, 2018
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 historical highest individual federal marginal income tax rates during the period covered by the table above 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 an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Shares through tax-deferred arrangements such as an individual retirement account (“IRA”) or other tax-advantaged accounts.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher The “Return After Taxes on Distributions and Sale of Fund Shares” may be higher than other return figures because when a capital loss occurs upon redemption of portfolio shares, a tax deduction is provided that benefits the investor.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
After-tax returns are calculated using the historical highest individual federal marginal income tax rates during the period covered by the table above and do not reflect the impact of state and local taxes. The “Return After Taxes on Distributions and Sale of Fund Shares” may be higher than other return figures because when a capital loss occurs upon redemption of portfolio shares, a tax deduction is provided that benefits the investor. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Shares through tax-deferred arrangements such as an individual retirement account (“IRA”) or other tax-advantaged accounts.
TrimTabs All Cap U.S. Free-Cash-Flow ETF | Russell 3000® Index (reflects no deduction for fees, expenses, or taxes)  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Russell 3000® Index (reflects no deduction for fees, expenses, or taxes)
1 Year rr_AverageAnnualReturnYear01 (5.24%)
Since Inception rr_AverageAnnualReturnSinceInception 8.45%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 27, 2016
TrimTabs All Cap U.S. Free-Cash-Flow ETF | TrimTabs All Cap U.S. Free-Cash-Flow ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Trading Symbol dei_TradingSymbol TTAC
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.59% [2]
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets none
Expenses (as a percentage of Assets) 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
Annual Return 2017 rr_AnnualReturn2017 25.60%
Annual Return 2018 rr_AnnualReturn2018 (5.99%)
Label rr_AverageAnnualReturnLabel TrimTabs All Cap U.S. Free-Cash-Flow ETF Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (5.99%)
Since Inception rr_AverageAnnualReturnSinceInception 11.33%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 27, 2016
TrimTabs All Cap U.S. Free-Cash-Flow ETF | TrimTabs All Cap U.S. Free-Cash-Flow ETF | After Taxes on Distributions  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel TrimTabs All Cap U.S. Free-Cash-Flow ETF Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 (6.13%)
Since Inception rr_AverageAnnualReturnSinceInception 11.19%
TrimTabs All Cap U.S. Free-Cash-Flow ETF | TrimTabs All Cap U.S. Free-Cash-Flow ETF | After Taxes on Distributions and Sales  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel TrimTabs All Cap U.S. Free-Cash-Flow ETF Return After Taxes on Distributions and Sale of Shares
1 Year rr_AverageAnnualReturnYear01 (3.45%)
Since Inception rr_AverageAnnualReturnSinceInception 8.77%
[1] The management fee is structured as a “unified fee,” pursuant to which the Fund’s investment adviser pays all expenses of the Fund, except for the management fee, payments under the Fund’s Rule 12b-1 plan, brokerage expenses, acquired fund fees and expenses, taxes, interest (including borrowing costs and dividend expenses on securities sold short), litigation expenses and other extraordinary expenses (including litigation to which the Trust or the Fund may be a party and indemnification of the Trustees and officers with respect thereto).
[2] The management fee is structured as a “unified fee,” pursuant to which the Fund’s investment adviser pays all expenses of the Fund, except for the management fee, payments under the Fund’s Rule 12b-1 plan, brokerage expenses, acquired fund fees and expenses, taxes, interest (including borrowing costs and dividend expenses on securities sold short), litigation expenses and other extraordinary expenses (including litigation to which the Trust or the Fund may be a party and indemnification of the Trustees and officers with respect thereto).