Defiance China Memory ETF Chinese Investment Risk [Member] Semiconductor & Semiconductor Equipment Industry Risks [Member] Technology Hardware, Storage & Peripherals Industry Risk [Member] Information Technology Sector Risk [Member] Foreign Securities Risk [Member] Currency Risk [Member] Depositary Receipt Risk [Member] Developed Markets Risk [Member] Foreign Investment Risk [Member] Equity Market Risk [Member] Focused Portfolio Risk [Member] Index Strategy Risk [Member] Data Risk [Member] Passive Investment Risk [Member] Tracking Error Risk [Member] Concentration Risk [Member] Management Risk [Member] Derivatives Risk [Member] Options Contracts [Member] Swap Agreements [Member] Equity Total Return Swaps [Member] Counterparty Risk [Member] ETF Risks [Member] Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk [Member] Cash Redemption Risk [Member] Costs of Buying or Selling Shares [Member] Shares May Trade at Prices Other Than NAV [Member] Trading [Member] Liquidity Risk [Member] Economic and Market Risk [Member] High Portfolio Turnover Risk [Member] Liquidity Risks [Member] Money Market Instrument Risk [Member] New Fund Risk [Member] Operational Risk [Member] IPO/SPAC/de-SPAC Risk [Member] Warrants and Rights Risk [Member] Tax Risk [Member] Underlying Index Risk [Member] Defiance China Memory ETF [Member] Defiance China Memory ETF Defiance China Memory ETF Underlying Index Risk. Tax Risk. Warrants and Rights Risk. IPO/SPAC/de-SPAC Risk. Operational Risk. New Fund Risk. Money Market Instrument Risk. Liquidity Risks. Liquidity Risk. High Portfolio Turnover Risk. Economic and Market Risk. Trading. Shares May Trade at Prices Other Than NAV. Costs of Buying or Selling Shares. Cash Redemption Risk. Authorized Participants, Market Makers, and Liquidity Providers Concentration Risk. ETF Risks. Counterparty Risk. Equity Total Return Swaps. Swap Agreements. Options Contracts. Derivatives Risk. Management Risk. Concentration Risk. Tracking Error Risk. Passive Investment Risk. Data Risk. Index Strategy Risk. Focused Portfolio Risk. Equity Market Risk. Foreign Investment Risk. Developed Markets Risk. Depositary Receipt Risk. Currency Risk. Foreign Securities Risk. Information Technology Sector Risk. Technology Hardware, Storage & Peripherals Industry Risk. Semiconductor & Semiconductor Equipment Industry Risks. Chinese Investment Risk.