Emerging Markets AI MAG 3 ETF Equity Market Risk [Member] Artificial Intelligence Risk [Member] Sector Risks [Member] Information Technology Sector Risk [Member] Semiconductors and Semiconductor Equipment Industry Risk [Member] Consumer Discretionary Sector Risk [Member] Utilities Sector Risk [Member] Energy Sector Risk [Member] Communications Services Sector Risk [Member] Industrials Sector Risk [Member] Foreign Securities Risk [Member] Emerging Markets Risk [Member] Frontier Markets Risk [Member] Depositary Receipt Risks [Member] Currency Exchange Rate Risk [Member] China Investing Risks [Member] China A-Shares Investment Risk [Member] Variable Interest Equity Investment Risk [Member] Derivatives Risk [Member] Swap Agreements [Member] Forward Contracts [Member] Counterparty Risk [Member] Concentration Risk [Member] Economic and Market 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] Geographic Investment Risk [Member] Market Capitalization Risks [Member] Large-Capitalization Investing [Member] Management Risk [Member] New Fund Risk [Member] Newer Sub-Adviser Risk [Member] Operational Risk [Member] U.S. Government and U.S. Agency Obligations Risk [Member] Emerging Markets Memory ETF Market Capitalization Risk [Member] Mid-Capitalization Investing [Member] Emerging Markets Semiconductor ETF Small-Capitalization Investing [Member] China AI Tigers LLM ETF Generative AI Industry Risk [Member] Custody Risk [Member] China AI ETF Emerging Markets GPU ETF GPU Companies Sector Risk [Member] Emerging Markets AI MAG 3 ETF [Member] Emerging Markets Memory ETF [Member] Emerging Markets Semiconductor ETF [Member] China AI Tigers LLM ETF [Member] China AI ETF [Member] Emerging Markets GPU ETF [Member] Emerging Markets AI MAG 3 ETF Emerging Markets AI MAG 3 ETF Emerging Markets Memory ETF Emerging Markets Memory ETF Emerging Markets Semiconductor ETF Emerging Markets Semiconductor ETF China AI Tigers LLM ETF China AI Tigers LLM ETF The China AI ETF The China AI ETF Emerging Markets GPU ETF Emerging Markets GPU ETF U.S. Government and U.S. Agency Obligations Risk. Operational Risk. Newer Sub-Adviser Risk. New Fund Risk. Management Risk. Large-Capitalization Investing. Market Capitalization Risk. Geographic Investment Risk. Concentration Risk. Counterparty Risk. Swap Agreements. China A-Shares Investment Risk. Variable Interest Equity Investment Risk. China Investing Risks. Currency Exchange Rate Risk. Depositary Receipt Risks. Frontier Markets Risk. Emerging Markets Risk. Foreign Securities 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. Economic and Market Risk. GPU Companies Sector Risk. Information Technology Sector Risk. Sector Risks. Equity Market Risk. Small-Capitalization Investing. Derivatives Risk. Industrials Sector Risk. Communications Services Sector Risk. Energy Sector Risk. Utilities Sector Risk. Consumer Discretionary Sector Risk. Semiconductors and Semiconductor Equipment Industry Risk. Artificial Intelligence Risk. Mid-Capitalization Investing. Market Capitalization Risks. Generative AI Industry Risk. Custody Risk.