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Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Provision for income taxes [Abstract]          
Income taxes using U.S. federal statutory rate $ (5,926,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ (10,309,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ (17,621,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate    
Amortization of Gain on IP Migration 767,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseAmortization 781,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseAmortization 754,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseAmortization    
State income taxes, net of federal benefit 2,215,000us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (1,390,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (4,299,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes    
Foreign rate differential 1,069,000us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential 2,761,000us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential 3,716,000us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential    
Valuation allowance 886,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount 7,683,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount 17,561,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount 20,500,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount 15,000,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Derivative charge (660,000)dcth_IncomeTaxReconciliationDerivativeCharge (937,000)dcth_IncomeTaxReconciliationDerivativeCharge (734,000)dcth_IncomeTaxReconciliationDerivativeCharge    
Stock option exercises and cancellations 1,748,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost 1,589,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost 310,000us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost    
Research and development credits (125,000)us-gaap_IncomeTaxReconciliationTaxCreditsResearch (1,090,000)us-gaap_IncomeTaxReconciliationTaxCreditsResearch 326,000us-gaap_IncomeTaxReconciliationTaxCreditsResearch    
Other 26,000us-gaap_IncomeTaxReconciliationOtherReconcilingItems 912,000us-gaap_IncomeTaxReconciliationOtherReconcilingItems (13,000)us-gaap_IncomeTaxReconciliationOtherReconcilingItems    
Total 0us-gaap_IncomeTaxExpenseBenefit 0us-gaap_IncomeTaxExpenseBenefit 0us-gaap_IncomeTaxExpenseBenefit    
Deferred tax assets [Abstract]          
Employee compensation accruals 1,866,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation 4,077,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation      
Accrued liabilities 1,356,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 870,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities      
Research tax credits 3,597,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 3,472,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch      
Other 45,000us-gaap_DeferredTaxAssetsOther 79,000us-gaap_DeferredTaxAssetsOther      
Net operating losses 74,359,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 71,874,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards      
Total deferred tax assets 81,223,000us-gaap_DeferredTaxAssetsGross 80,372,000us-gaap_DeferredTaxAssetsGross      
Deferred tax liability [Abstract]          
Total deferred tax liabilities 0us-gaap_DeferredIncomeTaxLiabilities 0us-gaap_DeferredIncomeTaxLiabilities      
Valuation allowance 81,223,000us-gaap_DeferredTaxAssetsValuationAllowance 80,372,000us-gaap_DeferredTaxAssetsValuationAllowance      
Net deferred tax assets 0us-gaap_DeferredTaxAssetsLiabilitiesNet 0us-gaap_DeferredTaxAssetsLiabilitiesNet      
Tax Credit Carryforward [Line Items]          
Percentage of valuation allowance (in hundredths) 100.00%dcth_ValuationAllowanceDeferredTaxAssetPercentage        
Valuation allowance increased 886,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount 7,683,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount 17,561,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount 20,500,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount 15,000,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Tax benefit related to the exercise of non qualified stock options 1,000,000us-gaap_DeferredTaxExpenseFromStockOptionsExercised        
Federal Research and Development Tax Credit Carryforwards [Member]          
Tax Credit Carryforward [Line Items]          
Tax credit carryforwards 3,600,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_ResearchMember		 3,500,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_ResearchMember		      
Tax credit carryforwards, expiration dates Dec. 31, 2034 Dec. 31, 2034      
Federal [Member]          
Operating Loss Carryforwards [Line Items]          
Operating loss carryforwards 171,600,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		 158,400,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		      
Operating loss carryforwards, amount subject to limitations 8,600,000dcth_OperatingLossCarryforwardsAmountSubjectToLimitations
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		        
Operating loss carryforwards, annual limitation 123,000dcth_OperatingLossCarryforwardsAnnualLimitations
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		        
Operating loss carryforwards, net of limitations 163,000,000dcth_OperatingLossCarryforwardsNetOfLimitations
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		        
Federal [Member] | Minimum [Member]          
Operating Loss Carryforwards [Line Items]          
Operating loss carryforwards, expiration dates Dec. 31, 2018        
Federal [Member] | Maximum [Member]          
Operating Loss Carryforwards [Line Items]          
Operating loss carryforwards, expiration dates Dec. 31, 2034        
State and City [Member]          
Operating Loss Carryforwards [Line Items]          
Operating loss carryforwards 242,900,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		 268,800,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		      
Operating loss carryforwards, expiration dates Dec. 31, 2034        
Foreign [Member]          
Operating Loss Carryforwards [Line Items]          
Operating loss carryforwards $ 21,800,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember		 $ 19,000,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember