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    <Log type="Info">Process Flow-Through: 107 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</Log>
    <Log type="Info">Process Flow-Through: 108 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS [Parenthetical]</Log>
    <Log type="Info">	Process Flow-Through: Removing column '1 Months Ended
Jan. 31, 2007'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '12 Months Ended
Dec. 31, 2011'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '141 Months Ended
Dec. 31, 2013'</Log>
    <Log type="Info">	Process Flow-Through: Removing column '12 Months Ended
Dec. 31, 2011
Common Stock [Member]'</Log>
  </Logs>
  <InputFiles>
    <File>chtp-20131231.xml</File>
    <File>chtp-20131231.xsd</File>
    <File>chtp-20131231_cal.xml</File>
    <File>chtp-20131231_def.xml</File>
    <File>chtp-20131231_lab.xml</File>
    <File>chtp-20131231_pre.xml</File>
  </InputFiles>
  <SupplementalFiles />
  <BaseTaxonomies />
  <HasPresentationLinkbase>true</HasPresentationLinkbase>
  <HasCalculationLinkbase>true</HasCalculationLinkbase>
</FilingSummary>
