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           Income Taxes (Detail) (USD $) 
        In Thousands, unless otherwise specified  | 
        
           Dec. 31, 2014 
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           Dec. 31, 2013 
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|---|---|---|
| Deferred tax assets: | ||
| Net operating loss carryforwards | $ 38,974us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | $ 31,450us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 
| Amortization of up-front fees | 2,668cndo_DeferredTaxAssetsAmortizationOfUpfrontFees | 2,865cndo_DeferredTaxAssetsAmortizationOfUpfrontFees | 
| Amortization of in-process R&D | 525cndo_DeferredTaxAssetsAmortizationOfInProcessResearchAndDevelopment | 460cndo_DeferredTaxAssetsAmortizationOfInProcessResearchAndDevelopment | 
| Stock compensation | 4,512us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits | 2,827us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits | 
| Accruals and reserves | 518us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals | 854us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals | 
| Tax credits | 3,856us-gaap_DeferredTaxAssetsTaxCreditCarryforwards | 2,686us-gaap_DeferredTaxAssetsTaxCreditCarryforwards | 
| Total deferred tax assets | 51,053us-gaap_DeferredTaxAssetsGross | 41,142us-gaap_DeferredTaxAssetsGross | 
| Valuation allowance | (50,567)us-gaap_DeferredTaxAssetsValuationAllowance | (41,142)us-gaap_DeferredTaxAssetsValuationAllowance | 
| Net deferred tax assets | 486us-gaap_DeferredTaxAssetsNet | |
| Deferred tax liabilities: | ||
| Unrealized gain/loss on investment | (486)us-gaap_DeferredTaxLiabilitiesInvestments | 0us-gaap_DeferredTaxLiabilitiesInvestments | 
| Total deferred tax assets, net | $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet | 
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- Definition 
          Represent deferred tax assets amortization of in process research and development. No definition available. 
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- Definition 
          Represent the amortization of up-front fees in deferred tax asset. No definition available. 
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- Definition 
          Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition 
          Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition 
          Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Details 
          
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- Definition 
          Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition 
          The tax effect as of the balance sheet date of the amount of future tax deductions arising from all unused tax credit carryforwards which have been reduced by a valuation allowance. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition 
          Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from compensation and benefits costs. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition 
          Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from reserves and accruals. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition 
          Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition 
          Amount of deferred tax liability attributable to taxable temporary differences from investments (excludes investments in subsidiaries and equity method investments). No definition available. 
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- Details 
          
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