VistaShares Shield(TM) S&P 500 Enhanced Protection ETF Equity Market Risk [Member] Derivatives Risk [Member] Options Contracts [Member] Counterparty Risk [Member] Economic and Market Risk [Member] Underlying ETF Risk [Member] Active Management Risk [Member] Market Capitalization Risk [Member] Large-Capitalization Investing [Member] ETF Risks [Member] Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk [Member] Costs of Buying or Selling Shares [Member] Shares May Trade at Prices Other Than NAV [Member] Trading [Member] New Fund Risk [Member] Newer Sub-Adviser Risk [Member] Operational Risk [Member] U.S. Government and U.S. Agency Obligations Risk [Member] VistaShares Shield(TM) International Enhanced Protection ETF Foreign Securities Risk [Member] Currency Exchange Rate Risk [Member] Depositary Receipt Risk [Member] Developed Markets Risk [Member] Mid-Capitalization Investing [Member] VistaShares Shield(TM) Emerging Markets Enhanced Protection ETF Emerging Markets Risk [Member] VistaShares Shield(TM) US Small Cap Enhanced Protection ETF Small-Capitalization Investing [Member] VistaShares Shield(TM) Nasdaq 100 Enhanced Protection ETF Technology Sector Risk [Member] VistaShares Shield(TM) Diversified Equity Enhanced Protection ETF VistaShares Shield(TM) Diversified Commodities Enhanced Protection ETF Commodity Risk [Member] ETN Risks [Member] VistaShares Shield(TM) Diversified Income Enhanced Protection ETF Fixed Income Risk [Member] Credit Risks [Member] High Yield Securities Risk [Member] Interest Rate Risks [Member] Utilities Sector Risk [Member] Real Estate Risk [Member] Distribution Risk [Member] High Dividend Style Risk [Member] VistaShares Shield(TM) S&P 500 Enhanced Protection ETF [Member] VistaShares Shield(TM) International Enhanced Protection ETF [Member] VistaShares Shield(TM) Emerging Markets Enhanced Protection ETF [Member] VistaShares Shield(TM) US Small Cap Enhanced Protection ETF [Member] VistaShares Shield(TM) Nasdaq 100 Enhanced Protection ETF [Member] VistaShares Shield(TM) Diversified Equity Enhanced Protection ETF [Member] VistaShares Shield(TM) Diversified Commodities Enhanced Protection ETF [Member] VistaShares Shield(TM) Diversified Income Enhanced Protection ETF [Member] VistaShares Shield(TM) S&P 500 Enhanced Protection ETF. VistaShares Shield(TM) S&P 500 Enhanced Protection ETF. VistaShares Shield(TM) International Enhanced Protection ETF. VistaShares Shield(TM) International Enhanced Protection ETF. VistaShares Shield(TM) Emerging Markets Enhanced Protection ETF. VistaShares Shield(TM) Emerging Markets Enhanced Protection ETF. VistaShares Shield(TM) US Small Cap Enhanced Protection ETF. VistaShares Shield(TM) US Small Cap Enhanced Protection ETF. VistaShares Shield(TM) Nasdaq 100 Enhanced Protection ETF. VistaShares Shield(TM) Nasdaq 100 Enhanced Protection ETF. VistaShares Shield(TM) Diversified Equity Enhanced Protection ETF. VistaShares Shield(TM) Diversified Equity Enhanced Protection ETF. VistaShares Shield(TM) Diversified Commodities Enhanced Protection ETF. VistaShares Shield(TM) Diversified Commodities Enhanced Protection ETF. VistaShares Shield(TM) Diversified Income Enhanced Protection ETF. VistaShares Shield(TM) Diversified Income Enhanced Protection ETF. U.S. Government and U.S. Agency Obligations Risk. Operational Risk. Newer Sub-Adviser Risk. New Fund Risk. Trading. Shares May Trade at Prices Other Than NAV. Costs of Buying or Selling Shares. Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. ETF Risks. Mid-Capitalization Investing. Large-Capitalization Investing. Market Capitalization Risk. Underlying ETF Risk. Active Management Risk. Emerging Markets Risk. Developed Markets Risk. Depositary Receipt Risk. Currency Exchange Rate Risk. Foreign Securities Risk. High Dividend Style Risk. Distribution Risk. Real Estate Risk. Utilities Sector Risk. Interest Rate Risks. High Yield Securities Risk. Credit Risks. Fixed Income Risk. Economic and Market Risk. Counterparty Risk. Options Contracts. Derivatives Risk. Equity Market Risk. ETN Risks. Commodity Risk. Small-Capitalization Investing. Technology Sector Risk.