Annual report pursuant to Section 13 and 15(d)

Stock Plans and Stock-Based Compensation - Additional Information (Detail)

v2.4.1.9
Stock Plans and Stock-Based Compensation - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Jun. 30, 2014
May 31, 2013
Nov. 30, 2012
Dec. 19, 2011
Dec. 31, 2007
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Stock Based compensation, authorized number of shares                 6,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Stock Based compensation, shares granted under the plan, net of cancellations 7,043,280us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod                
Stock Based compensation, shares available for issuance 1,256,720us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant     1,256,720us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant          
Stock Based compensation, Options Contractual term 10 years                
Stock-based compensation expense related to all unvested stock option $ 1,200,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions     $ 1,200,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions          
Stock-based compensation weighted-average vesting period 7 months 6 days                
Employee Stock Purchase Plan to eligible employees, Reckoning fair value percentage during offering period 85.00%cndo_EmployeeStockPurchasePlanOfferingFairValueReckoningPercentage     85.00%cndo_EmployeeStockPurchasePlanOfferingFairValueReckoningPercentage          
Employee Stock Purchase Plan to eligible employees, Number of shares purchased by employees 63,194cndo_EmployeeStockPurchasePlanNumberOfSharesPurchasedByEmployees     63,194cndo_EmployeeStockPurchasePlanNumberOfSharesPurchasedByEmployees          
Employee Stock Purchase Plan to eligible employees, Number of shares available for future sales 136,806cndo_EmployeeStockPurchasePlanNumberOfSharesAvailableForFutureSale     136,806cndo_EmployeeStockPurchasePlanNumberOfSharesAvailableForFutureSale          
Employee Stock Purchase Plan to eligible employees, compensation expense recognized 25,000cndo_EmployeeStockPurchasePlanCompensationExpenseRecognized 46,000cndo_EmployeeStockPurchasePlanCompensationExpenseRecognized 95,000cndo_EmployeeStockPurchasePlanCompensationExpenseRecognized            
Share Based Compensation Restricted Stock Units 4,000,000us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition 66,000us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition              
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate                   
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate                   
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 7 months 6 days                
Common Stock Par Or Stated Value Per Share $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare   $ 0.001us-gaap_CommonStockParOrStatedValuePerShare          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value   3.77us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 5.74us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1            
Share Price $ 2.93us-gaap_SharePrice     $ 2.93us-gaap_SharePrice          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                 6,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Proceeds from Stock Options Exercised 600,000us-gaap_ProceedsFromStockOptionsExercised 1,000,000us-gaap_ProceedsFromStockOptionsExercised              
Fair Value Assumption Historical Volatility Rate 80.00%cndo_FairValueAssumptionHistoricalVolatilityRate                
Fair Value Assumptions Implied Volatility Rate 20.00%cndo_FairValueAssumptionsImpliedVolatilityRate                
Research and Development Expense [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Allocated Share-based Compensation Expense 1,100,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember 		3,000,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember 		1,500,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember 		           
General and Administrative Expense [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Allocated Share-based Compensation Expense 4,400,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember 		2,900,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember 		2,100,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember 		           
Employee Stock [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Employee Stock Purchase Plan to eligible employees, Reckoning fair value percentage during offering period 85.00%cndo_EmployeeStockPurchasePlanOfferingFairValueReckoningPercentage
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember 		85.00%cndo_EmployeeStockPurchasePlanOfferingFairValueReckoningPercentage
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember 		  85.00%cndo_EmployeeStockPurchasePlanOfferingFairValueReckoningPercentage
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember 		85.00%cndo_EmployeeStockPurchasePlanOfferingFairValueReckoningPercentage
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember 		85.00%cndo_EmployeeStockPurchasePlanOfferingFairValueReckoningPercentage
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember 		85.00%cndo_EmployeeStockPurchasePlanOfferingFairValueReckoningPercentage
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember 		   
Common Stock issued in connection with the first ESPP offering   6,065us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember 		  6,841us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember 		7,139us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember 		21,505us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember 		21,644us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember 		200,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember 		 
Common Stock Par Or Stated Value Per Share $ 1.80us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember 		$ 1.39us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember 		  $ 1.80us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember 		$ 1.45us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember 		$ 3.88us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember 		$ 4.02us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember 		   
Share Price $ 2.12us-gaap_SharePrice
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember 		$ 1.64us-gaap_SharePrice
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember 		  $ 2.12us-gaap_SharePrice
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember 		$ 1.71us-gaap_SharePrice
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember 		$ 4.56us-gaap_SharePrice
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember 		$ 4.73us-gaap_SharePrice
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_EmployeeStockMember 		   
Restricted Stock [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Stock-based compensation weighted-average vesting period 3 years                
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 114.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember 		               
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 5 years                
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 1.55%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember 		               
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options 15,200,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember 		    15,200,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember 		         
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 3 years                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value $ 11,600,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember 		$ 7,600,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember 		             
2007 Plan [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Stock Based compensation, shares available for issuance 6,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= cndo_TwoThousandSevenPlanMember 		    6,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= cndo_TwoThousandSevenPlanMember 		         
2013 Plan [Member]                  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                  
Stock Based compensation, authorized number of shares 2,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= cndo_TwoThousandThirteenPlanMember 		    2,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= cndo_TwoThousandThirteenPlanMember 		         
Stock Based compensation, shares available for issuance 2,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= cndo_TwoThousandThirteenPlanMember 		    2,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= cndo_TwoThousandThirteenPlanMember 		         
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 2,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= cndo_TwoThousandThirteenPlanMember 		    2,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= cndo_TwoThousandThirteenPlanMember