ETF Risks, Cash Redemption Risk Member ETF Risks, Cash Redemption Risk Member Derivatives Risk, Swap Agreements Risk Member Derivatives Risk, Swap Agreements Risk Member Emerging Technologies Investment Risk Member Emerging Technologies Investment Risk Member Market Capitalization Risk Member Market Capitalization Risk Member Emerging Markets Risk, Geopolitical Risk Member Emerging Markets Risk, Geopolitical Risk Member Emerging Markets Risk Member Emerging Markets Risk Member Concentration Risk, Technology Hardware And Equipment Industry Risk Member Concentration Risk, Technology Hardware And Equipment Industry Risk Member Passive Investment Risk Member Passive Investment Risk Member Market Capitalization Risk, Small-Capitalization Investing Risk Member Market Capitalization Risk, Small-Capitalization Investing Risk Member ETF Risks, Trading Risk Member ETF Risks, Trading Risk Member Concentration Risk, Semiconductors And Semiconductor Equipment Industry Risk Member Concentration Risk, Semiconductors And Semiconductor Equipment Industry Risk Member Collateral Securities Risk Member Collateral Securities Risk Member ETF Risks Member ETF Risks Member Tax Risk Member Tax Risk Member Portfolio Turnover Risk Member Portfolio Turnover Risk Member Foreign Securities Risk Member Foreign Securities Risk Member Index Methodology Risk Member Index Methodology Risk Member ADR Risk Member ADR Risk Member ETF Risks, Costs Of Buying Or Selling Shares Risk Member ETF Risks, Costs Of Buying Or Selling Shares Risk Member Index Provider Risk Member Index Provider Risk Member Market Capitalization Risk, Large-Capitalization Investing Risk Member Market Capitalization Risk, Large-Capitalization Investing Risk Member Derivatives Risk Member Derivatives Risk Member Tracking Error Risk Member Tracking Error Risk Member Derivatives Risk, Swaps Capacity Risk Member Derivatives Risk, Swaps Capacity Risk Member Defiance DRAM & Memory ETF S000107094 Defiance DRAM & Memory ETF previously Defiance Pure Play Memory ETF C000277981 Currency Exchange Rate Risk Member Currency Exchange Rate Risk Member Emerging Markets Risk, Capital Controls And Sanctions Risk Member Emerging Markets Risk, Capital Controls And Sanctions Risk Member Concentration Risk Member Concentration Risk Member Sector Risk Member Sector Risk Member Sector Risk, Information Technology Sector Risk Member Sector Risk, Information Technology Sector Risk Member Market Capitalization Risk, Mid-Capitalization Investing Risk Member Market Capitalization Risk, Mid-Capitalization Investing Risk Member ETF Risks, Shares May Trade At Prices Other Than NAV Risk Member ETF Risks, Shares May Trade At Prices Other Than NAV Risk Member ETF Risks, Authorized Participants, Market Makers, And Liquidity Providers Concentration Risk Member ETF Risks, Authorized Participants, Market Makers, And Liquidity Providers Concentration Risk Member Defiance DRAM & Memory ETF Class S000107094 Defiance DRAM & Memory ETF previously Defiance Pure Play Memory ETF C000277981 Geographic Investment Risk Member Geographic Investment Risk Member New Fund Risk Member New Fund Risk Member Geographic Investment Risk, Risks Of Investing In South Korea Risk Member Geographic Investment Risk, Risks Of Investing In South Korea Risk Member Cybersecurity Risk Member Cybersecurity Risk Member Counterparty Risk Member Counterparty Risk Member Associated Risks Of Investing In DRAM & Memory Companies Risk Member Associated Risks Of Investing In DRAM & Memory Companies Risk Member Equity Market Risk Member Equity Market Risk Member