<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.21.2</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>3</ContextCount>
  <ElementCount>129</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>true</FootnotesReported>
  <SegmentCount>2</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>2</UnitCount>
  <MyReports>
    <Report instance="s133557_485apos.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>00010 - Document - Document And Entity Information {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.exchangetradedconcepts/role/DocumentAndEntityInformationElements</Role>
      <ShortName>Document And Entity Information</ShortName>
      <MenuCategory></MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="s133557_485apos.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>true</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>00080 - Document - Risk/Return Summary - FMQQ The Next Frontier Internet &amp; Ecommerce ETF {Unlabeled}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.exchangetradedconcepts/role/RiskReturnSummaryFmqqTheNextFrontierInternetEcommerceEtf</Role>
      <ShortName>Risk/Return Summary - FMQQ The Next Frontier Internet &amp; Ecommerce ETF</ShortName>
      <MenuCategory></MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="s133557_485apos.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R5.htm</HtmlFileName>
      <LongName>00090 - Document - Risk/Return Detail Data - FMQQ The Next Frontier Internet &amp; Ecommerce ETF {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.exchangetradedconcepts/role/RiskReturnDetailDataFmqqTheNextFrontierInternetEcommerceEtf</Role>
      <ShortName>Risk/Return Detail Data - FMQQ The Next Frontier Internet &amp; Ecommerce ETF</ShortName>
      <MenuCategory></MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="s133557_485apos.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R6.htm</HtmlFileName>
      <LongName>040000 - Disclosure - Risk/Return Detail Data {Elements}</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/rr/role/RiskReturnDetailData</Role>
      <ShortName>Risk/Return Detail Data</ShortName>
      <MenuCategory></MenuCategory>
      <Position>4</Position>
    </Report>
    <Report>
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <LongName>All Reports</LongName>
      <ReportType>Book</ReportType>
      <ShortName>All Reports</ShortName>
    </Report>
  </MyReports>
  <InputFiles>
    <File doctype="485APOS" original="s133557_485apos.htm">s133557_485apos.htm</File>
    <File>ck0001452937-20210923.xsd</File>
    <File>ck0001452937-20210923_cal.xml</File>
    <File>ck0001452937-20210923_def.xml</File>
    <File>ck0001452937-20210923_lab.xml</File>
    <File>ck0001452937-20210923_pre.xml</File>
    <File>s133557_ex99-d2.htm</File>
    <File>s133557_ex99-e19.htm</File>
    <File>s133557_ex99-g2.htm</File>
    <File>s133557_ex99-h35.htm</File>
    <File>s133557_ex99-h36.htm</File>
    <File>s133557_ex99-h41.htm</File>
    <File>s133557_ex99-h57.htm</File>
    <File>s133557_ex99-i13.htm</File>
    <File>s133557_ex99-m1.htm</File>
  </InputFiles>
  <SupplementalFiles/>
  <BaseTaxonomies>
    <BaseTaxonomy>http://xbrl.sec.gov/rr/2021</BaseTaxonomy>
    <BaseTaxonomy>http://xbrl.sec.gov/dei/2021</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
