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Prepaid Expenses and Other Current Assets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Prepaid expenses and other current assets [Abstract]    
Insurance premiums $ 591us-gaap_PrepaidInsurance $ 407us-gaap_PrepaidInsurance
Professional fees 0dcth_ProfessionalFeesCurrent 377dcth_ProfessionalFeesCurrent
Income tax credits receivable 0us-gaap_IncomeTaxesReceivable 326us-gaap_IncomeTaxesReceivable
Kits for clinical use 161dcth_KitsForClinicalUse 287dcth_KitsForClinicalUse
Other 222us-gaap_OtherAssetsCurrent [1] 314us-gaap_OtherAssetsCurrent [1]
Total prepaid and other current assets $ 974us-gaap_PrepaidExpenseAndOtherAssetsCurrent $ 1,711us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Maximum percentage of prepaid expenses and other current assets (in hundredths) 5.00%dcth_MaximumPercentageOfPrepaidExpensesAndOtherCurrentAssets 5.00%dcth_MaximumPercentageOfPrepaidExpensesAndOtherCurrentAssets
[1] Other consists of various prepaid expenses and other current assets, with no individual item accounting for more than 5% at December 31, 2014 and 2013.