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Loan and Security Agreement (Details) (Silicon Valley Bank [Member], USD $)
 12 Months Ended
Dec. 31, 2014
Silicon Valley Bank [Member]
  
Line of Credit Facility [Line Items]  
Loan and security agreement 4 years
Credit agreement, revolving credit facility $ 20,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= dcth_SiliconValleyBankMember
Line of credit facility, covenant terms In order to draw down on the facility, the Company will need to have at least the greater of (i) $15,000,000 in cash and cash equivalents in its account with SVB plus the amount of all outstanding obligations of the Company owed to SVB and (ii) trailing 3 months Cash Burn (as defined in the Credit Agreement) plus the amount of all outstanding obligations of the Company owed to SVB.
Cash and cash equivalents $ 15,000,000dcth_LineOfCreditFacilityCovenantTermsAmount
/ us-gaap_LineOfCreditFacilityAxis
= dcth_SiliconValleyBankMember