Annual report pursuant to Section 13 and 15(d)

Equity - Additional Information (Detail)

v2.4.1.9
Equity - Additional Information (Detail) (USD $)
1 Months Ended 12 Months Ended 0 Months Ended
Jul. 31, 2013
Apr. 30, 2013
Oct. 31, 2012
Sep. 30, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Nov. 06, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Public offering of Common Stock, shares           10,558,422cndo_StockIssuedDuringPeriodSharesIssuedForCashAtMarketCostShares    
Proceeds from issuance of Common stock         $ 4,117,000us-gaap_ProceedsFromIssuanceOfCommonStock $ 92,399,000us-gaap_ProceedsFromIssuanceOfCommonStock $ 28,855,000us-gaap_ProceedsFromIssuanceOfCommonStock  
Common Stock Offering Price           70,000,000cndo_CommonStockOfferingPrice    
Stock Issuance, Maximum Amount Of Proceeds Approved 200,000,000cndo_StockIssuanceMaximumAmountOfProceedsApproved 45,000,000cndo_StockIssuanceMaximumAmountOfProceedsApproved 30,000,000cndo_StockIssuanceMaximumAmountOfProceedsApproved 75,000,000cndo_StockIssuanceMaximumAmountOfProceedsApproved        
Professional Fees         32,000us-gaap_ProfessionalFees      
Share Price         $ 2.93us-gaap_SharePrice      
After Amendment [Member] | Preferred Stock [Member]                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Capital Units, Authorized         15,000,000us-gaap_CapitalUnitsAuthorized
/ cndo_AmendmentAxis
= cndo_AfterAmendmentMember
/ us-gaap_EquityInterestIssuedOrIssuableByTypeAxis
= us-gaap_PreferredStockMember
15,000,000us-gaap_CapitalUnitsAuthorized
/ cndo_AmendmentAxis
= cndo_AfterAmendmentMember
/ us-gaap_EquityInterestIssuedOrIssuableByTypeAxis
= us-gaap_PreferredStockMember
   
Share Price         $ 0.001us-gaap_SharePrice
/ cndo_AmendmentAxis
= cndo_AfterAmendmentMember
/ us-gaap_EquityInterestIssuedOrIssuableByTypeAxis
= us-gaap_PreferredStockMember
$ 0.001us-gaap_SharePrice
/ cndo_AmendmentAxis
= cndo_AfterAmendmentMember
/ us-gaap_EquityInterestIssuedOrIssuableByTypeAxis
= us-gaap_PreferredStockMember
   
After Amendment [Member] | Common Stock [Member]                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Capital Units, Authorized         100,000,000us-gaap_CapitalUnitsAuthorized
/ cndo_AmendmentAxis
= cndo_AfterAmendmentMember
/ us-gaap_EquityInterestIssuedOrIssuableByTypeAxis
= us-gaap_CommonStockMember
100,000,000us-gaap_CapitalUnitsAuthorized
/ cndo_AmendmentAxis
= cndo_AfterAmendmentMember
/ us-gaap_EquityInterestIssuedOrIssuableByTypeAxis
= us-gaap_CommonStockMember
   
Share Price         $ 0.001us-gaap_SharePrice
/ cndo_AmendmentAxis
= cndo_AfterAmendmentMember
/ us-gaap_EquityInterestIssuedOrIssuableByTypeAxis
= us-gaap_CommonStockMember
$ 0.001us-gaap_SharePrice
/ cndo_AmendmentAxis
= cndo_AfterAmendmentMember
/ us-gaap_EquityInterestIssuedOrIssuableByTypeAxis
= us-gaap_CommonStockMember
   
Lindsay A. Rosenwald [Member]                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Proceeds from issuance of Common stock               $ 3,500,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_StatementClassOfStockAxis
= cndo_LindsayARosenwaldMember
Share Price               $ 1.61us-gaap_SharePrice
/ us-gaap_StatementClassOfStockAxis
= cndo_LindsayARosenwaldMember