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           Equity - Additional Information (Detail) (USD $)
  
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        1 Months Ended | 
        12 Months Ended | 
        0 Months Ended | 
      
      
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           Jul. 31, 2013 
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           Apr. 30, 2013 
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           Oct. 31, 2012 
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           Sep. 30, 2012 
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           Dec. 31, 2014 
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           Dec. 31, 2013 
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           Dec. 31, 2012 
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           Nov. 06, 2014 
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        | Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | 
         
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        | Public offering of Common Stock, shares | 
         
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10,558,422cndo_StockIssuedDuringPeriodSharesIssuedForCashAtMarketCostShares
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        | Proceeds from issuance of Common stock | 
         
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$ 4,117,000us-gaap_ProceedsFromIssuanceOfCommonStock
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$ 92,399,000us-gaap_ProceedsFromIssuanceOfCommonStock
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$ 28,855,000us-gaap_ProceedsFromIssuanceOfCommonStock
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        | Common Stock Offering Price | 
         
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70,000,000cndo_CommonStockOfferingPrice
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        | Stock Issuance, Maximum Amount Of Proceeds Approved | 
        
200,000,000cndo_StockIssuanceMaximumAmountOfProceedsApproved
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45,000,000cndo_StockIssuanceMaximumAmountOfProceedsApproved
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30,000,000cndo_StockIssuanceMaximumAmountOfProceedsApproved
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75,000,000cndo_StockIssuanceMaximumAmountOfProceedsApproved
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        | Professional Fees | 
         
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32,000us-gaap_ProfessionalFees
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        | Share Price | 
         
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$ 2.93us-gaap_SharePrice
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        | After Amendment [Member] | Preferred Stock [Member] | 
         
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        | Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | 
         
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        | Capital Units, Authorized | 
         
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15,000,000us-gaap_CapitalUnitsAuthorized / cndo_AmendmentAxis = cndo_AfterAmendmentMember / us-gaap_EquityInterestIssuedOrIssuableByTypeAxis = us-gaap_PreferredStockMember
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15,000,000us-gaap_CapitalUnitsAuthorized / cndo_AmendmentAxis = cndo_AfterAmendmentMember / us-gaap_EquityInterestIssuedOrIssuableByTypeAxis = us-gaap_PreferredStockMember
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        | Share Price | 
         
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$ 0.001us-gaap_SharePrice / cndo_AmendmentAxis = cndo_AfterAmendmentMember / us-gaap_EquityInterestIssuedOrIssuableByTypeAxis = us-gaap_PreferredStockMember
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$ 0.001us-gaap_SharePrice / cndo_AmendmentAxis = cndo_AfterAmendmentMember / us-gaap_EquityInterestIssuedOrIssuableByTypeAxis = us-gaap_PreferredStockMember
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        | After Amendment [Member] | Common Stock [Member] | 
         
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        | Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | 
         
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        | Capital Units, Authorized | 
         
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100,000,000us-gaap_CapitalUnitsAuthorized / cndo_AmendmentAxis = cndo_AfterAmendmentMember / us-gaap_EquityInterestIssuedOrIssuableByTypeAxis = us-gaap_CommonStockMember
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100,000,000us-gaap_CapitalUnitsAuthorized / cndo_AmendmentAxis = cndo_AfterAmendmentMember / us-gaap_EquityInterestIssuedOrIssuableByTypeAxis = us-gaap_CommonStockMember
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        | Share Price | 
         
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$ 0.001us-gaap_SharePrice / cndo_AmendmentAxis = cndo_AfterAmendmentMember / us-gaap_EquityInterestIssuedOrIssuableByTypeAxis = us-gaap_CommonStockMember
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$ 0.001us-gaap_SharePrice / cndo_AmendmentAxis = cndo_AfterAmendmentMember / us-gaap_EquityInterestIssuedOrIssuableByTypeAxis = us-gaap_CommonStockMember
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        | Lindsay A. Rosenwald [Member] | 
         
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        | Share Based Compensation Arrangement By Share Based Payment Award [Line Items] | 
         
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        | Proceeds from issuance of Common stock | 
         
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$ 3,500,000us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementClassOfStockAxis = cndo_LindsayARosenwaldMember
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        | Share Price | 
         
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$ 1.61us-gaap_SharePrice / us-gaap_StatementClassOfStockAxis = cndo_LindsayARosenwaldMember
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