<?xml version='1.0' encoding='utf-8'?>
<FilingSummary>
  <Version>3.26.1</Version>
  <ProcessingTime/>
  <ReportFormat>html</ReportFormat>
  <ContextCount>40</ContextCount>
  <ElementCount>30</ElementCount>
  <EntityCount>1</EntityCount>
  <FootnotesReported>false</FootnotesReported>
  <SegmentCount>11</SegmentCount>
  <ScenarioCount>0</ScenarioCount>
  <TuplesReported>false</TuplesReported>
  <UnitCount>1</UnitCount>
  <MyReports>
    <Report instance="ntra-20260611xdef14a.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R1.htm</HtmlFileName>
      <LongName>995200090 - Document - Document and Entity Information</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://natera.com/role/DocumentDocumentAndEntityInformation</Role>
      <ShortName>Document and Entity Information</ShortName>
      <MenuCategory>Cover</MenuCategory>
      <Position>1</Position>
    </Report>
    <Report instance="ntra-20260611xdef14a.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R2.htm</HtmlFileName>
      <LongName>995410 - Disclosure - Pay vs Performance Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/PvpDisclosure</Role>
      <ShortName>Pay vs Performance Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>2</Position>
    </Report>
    <Report instance="ntra-20260611xdef14a.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R3.htm</HtmlFileName>
      <LongName>995443 - Disclosure - Award Timing Disclosure</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/AwardTimingDisclosure</Role>
      <ShortName>Award Timing Disclosure</ShortName>
      <MenuCategory>Notes</MenuCategory>
      <Position>3</Position>
    </Report>
    <Report instance="ntra-20260611xdef14a.htm">
      <IsDefault>false</IsDefault>
      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R4.htm</HtmlFileName>
      <LongName>995447 - Disclosure - Insider Trading Policies and Procedures</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://xbrl.sec.gov/ecd/role/InsiderTradingPoliciesProc</Role>
      <ShortName>Insider Trading Policies and Procedures</ShortName>
      <MenuCategory>Notes</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>ntra-20260611.xsd</File>
    <File>ntra-20260611_def.xml</File>
    <File>ntra-20260611_lab.xml</File>
    <File>ntra-20260611_pre.xml</File>
    <File doctype="DEF 14A" isProxy="true" isUsgaap="true" original="ntra-20260611xdef14a.htm">ntra-20260611xdef14a.htm</File>
  </InputFiles>
  <SupplementalFiles>
    <File>ntra-20260611xdef14a_a005.jpg</File>
    <File>ntra-20260611xdef14a_a007.jpg</File>
    <File>ntra-20260611xdef14a_a008.jpg</File>
    <File>ntra-20260611xdef14a_a009.jpg</File>
    <File>ntra-20260611xdef14a_a010.jpg</File>
    <File>ntra-20260611xdef14a_a011.jpg</File>
    <File>ntra-20260611xdef14a_a012.jpg</File>
    <File>ntra-20260611xdef14a_a013.jpg</File>
    <File>ntra-20260611xdef14a_a014.jpg</File>
    <File>ntra-20260611xdef14a_a015.jpg</File>
    <File>ntra-20260611xdef14a_a016.jpg</File>
    <File>ntra-20260611xdef14a_a017.jpg</File>
    <File>ntra-20260611xdef14a_a019.jpg</File>
    <File>ntra-20260611xdef14a_a020.jpg</File>
    <File>ntra-20260611xdef14a_a021.jpg</File>
    <File>ntra-20260611xdef14a_a022.jpg</File>
    <File>ntra-20260611xdef14a_a023.jpg</File>
    <File>ntra-20260611xdef14a_a028.jpg</File>
    <File>ntra-20260611xdef14a_a031.jpg</File>
    <File>ntra-20260611xdef14a_a034.jpg</File>
    <File>ntra-20260611xdef14a_a037.jpg</File>
    <File>ntra-20260611xdef14a_a048.jpg</File>
    <File>ntra-20260611xdef14a_a049.jpg</File>
    <File>ntra-20260611xdef14a_a059.jpg</File>
    <File>ntra-20260611xdef14a_a061.jpg</File>
    <File>ntra-20260611xdef14a_a074.jpg</File>
    <File>ntra-20260611xdef14a_a086.jpg</File>
    <File>ntra-20260611xdef14a_a098.jpg</File>
    <File>ntra-20260611xdef14a_a111.jpg</File>
    <File>ntra-20260611xdef14a_a123.jpg</File>
    <File>ntra-20260611xdef14a_a135.jpg</File>
    <File>ntra-20260611xdef14a_a148.jpg</File>
    <File>ntra-20260611xdef14a_a160.jpg</File>
    <File>ntra-20260611xdef14a_a173.jpg</File>
    <File>ntra-20260611xdef14a_a185.jpg</File>
    <File>ntra-20260611xdef14a_a197.jpg</File>
    <File>ntra-20260611xdef14a_a221.jpg</File>
    <File>ntra-20260611xdef14a_a222.jpg</File>
    <File>ntra-20260611xdef14a_a224.jpg</File>
    <File>ntra-20260611xdef14a_a225.jpg</File>
    <File>ntra-20260611xdef14a_a226.jpg</File>
    <File>ntra-20260611xdef14a_a227.jpg</File>
    <File>ntra-20260611xdef14a_a228.jpg</File>
    <File>ntra-20260611xdef14a_a229.jpg</File>
    <File>ntra-20260611xdef14a_a230.jpg</File>
    <File>ntra-20260611xdef14a_a231.jpg</File>
    <File>ntra-20260611xdef14a_a232.jpg</File>
    <File>ntra-20260611xdef14a_a233.jpg</File>
    <File>ntra-20260611xdef14a_a234.jpg</File>
    <File>ntra-20260611xdef14a_a244.jpg</File>
    <File>ntra-20260611xdef14a_a245.jpg</File>
    <File>ntra-20260611xdef14a_a258.jpg</File>
    <File>ntra-20260611xdef14a_a271.jpg</File>
    <File>ntra-20260611xdef14a_a272.jpg</File>
    <File>ntra-20260611xdef14a_a273.jpg</File>
    <File>ntra-20260611xdef14a_a286.jpg</File>
    <File>ntra-20260611xdef14a_bg001.jpg</File>
    <File>ntra-20260611xdef14a_bg002.jpg</File>
  </SupplementalFiles>
  <BaseTaxonomies>
    <BaseTaxonomy items="5">http://fasb.org/us-gaap/2024</BaseTaxonomy>
    <BaseTaxonomy items="4">http://xbrl.sec.gov/dei/2024</BaseTaxonomy>
    <BaseTaxonomy items="94">http://xbrl.sec.gov/ecd/2024</BaseTaxonomy>
  </BaseTaxonomies>
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>false</HasCalculationLinkbase>
</FilingSummary>