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      <ShortName>Reconciliation of the statutory tax rates (Detail)</ShortName>
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      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R55.htm</HtmlFileName>
      <LongName>055 - Disclosure - INCOME TAXES - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nilethera.com/role/IncomeTaxesAdditionalInformationDetail</Role>
      <ShortName>INCOME TAXES - Additional Information (Detail)</ShortName>
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    <Report>
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      <HasEmbeddedReports>false</HasEmbeddedReports>
      <HtmlFileName>R56.htm</HtmlFileName>
      <LongName>056 - Disclosure - RELATED PARTIES - Additional Information (Detail)</LongName>
      <ReportType>Sheet</ReportType>
      <Role>http://www.nilethera.com/role/RelatedPartiesAdditionalInformationDetail</Role>
      <ShortName>RELATED PARTIES - Additional Information (Detail)</ShortName>
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    <Report>
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      <HtmlFileName>R57.htm</HtmlFileName>
      <LongName>057 - Disclosure - COMMITMENTS AND CONTINGENCIES - Additional Information (Detail)</LongName>
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      <ShortName>COMMITMENTS AND CONTINGENCIES - Additional Information (Detail)</ShortName>
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  <Logs>
    <Log type="Info">Element nltx_CommonStockWarrantLiability had a mix of decimals attribute values: -5 0.</Log>
    <Log type="Info">Element nltx_PercentageOfCashPaymentReceived had a mix of decimals attribute values: 2 3.</Log>
    <Log type="Info">Element nltx_PercentageOfCommonStockSharesReceived had a mix of decimals attribute values: 2 3.</Log>
    <Log type="Info">Element us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights had a mix of decimals attribute values: 2 3.</Log>
    <Log type="Info">Element us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate had a mix of decimals attribute values: 2 3.</Log>
    <Log type="Warning">Warning: The equity rendering routine was not applied to 005 - Statement - STATEMENT OF STOCKHOLDERS' (DEFICIT) EQUITY.
None of the elements feature the 'periodStartLabel' preferred label role.</Log>
    <Log type="Info">'Monetary' elements on report '039 - Disclosure - INTANGIBLE ASSETS AND INTELLECTUAL PROPERTY - Additional Information (Detail)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">'Monetary' elements on report '046 - Disclosure - STOCKHOLDERS' EQUITY - Additional Information (Detail)' had a mix of different decimal attribute values.</Log>
    <Log type="Info">Process Flow-Through: 002 - Statement - BALANCE SHEETS</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2010'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2009'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2008'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2007'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2006'</Log>
    <Log type="Info">	Process Flow-Through: Removing column 'Dec. 31, 2005'</Log>
    <Log type="Info">Process Flow-Through: 003 - Statement - BALANCE SHEETS (Parenthetical)</Log>
    <Log type="Info">Process Flow-Through: 004 - Statement - STATEMENTS OF OPERATIONS</Log>
    <Log type="Info">	Process Flow-Through: Removing column '5 Months Ended
Dec. 31, 2005'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '12 Months Ended
Dec. 31, 2010'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '12 Months Ended
Dec. 31, 2009'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '12 Months Ended
Dec. 31, 2008'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '12 Months Ended
Dec. 31, 2007'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '12 Months Ended
Dec. 31, 2006'</Log>
    <Log type="Info">Process Flow-Through: 005 - Statement - STATEMENT OF STOCKHOLDERS' (DEFICIT) EQUITY</Log>
    <Log type="Info">Process Flow-Through: 006 - Statement - STATEMENT OF STOCKHOLDERS' (DEFICIT) EQUITY (Parenthetical)</Log>
    <Log type="Info">Process Flow-Through: 007 - Statement - STATEMENTS OF CASH FLOWS</Log>
  </Logs>
  <InputFiles>
    <File>nltx-20121231.xml</File>
    <File>nltx-20121231.xsd</File>
    <File>nltx-20121231_cal.xml</File>
    <File>nltx-20121231_def.xml</File>
    <File>nltx-20121231_lab.xml</File>
    <File>nltx-20121231_pre.xml</File>
  </InputFiles>
  <SupplementalFiles />
  <BaseTaxonomies />
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
