Defiance Photonics ETF Equity Market Risk [Member] Focused Portfolio Risk [Member] Photonics Companies Risk [Member] Index Strategy Risk [Member] Data Risk [Member] Passive Investment Risk [Member] Tracking Error Risk [Member] Concentration Risk [Member] Semiconductor Companies Risk [Member] Management Risk [Member] Market Capitalization Risk [Member] Large-Capitalization Investing [Member] Mid-Capitalization Investing [Member] Small-Capitalization Investing [Member] Foreign Investment Risk [Member] Risks Related to Changes in Government Policies and Institutions [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 Risk 1 [Member] Money Market Instrument Risk [Member] New Fund Risk [Member] Operational Risk [Member] Newly Public Company Risk [Member] Warrants and Rights Risk [Member] Tax Risk [Member] Underlying Index Risk [Member] Defiance Photonics ETF [Member] Defiance Photonics ETF Defiance Photonics ETF Underlying Index Risk. Tax Risk. Warrants and Rights Risk. Newly Public Company Risk. Operational Risk. New Fund Risk. Money Market Instrument Risk. Liquidity Risk 1. 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. Risks Related to Changes in Government Policies and Institutions. Foreign Investment Risk. Small-Capitalization Investing. Mid-Capitalization Investing. Large-Capitalization Investing. Market Capitalization Risk. Management Risk. Semiconductor Companies Risk. Concentration Risk. Tracking Error Risk. Passive Investment Risk. Data Risk. Index Strategy Risk. Photonics Companies Risk. Focused Portfolio Risk. Equity Market Risk.