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Taxes (Details)	6 Months Ended
	Jun. 30, 2013
IRS [Member]
Income Tax Contingency [Line Items]
Tax year open for examination	December 31, 2009 to December 31, 2012
State Authorities [Member]
Income Tax Contingency [Line Items]
Tax year open for examination	December 31, 2009 to December 31, 2012
Republic of Ireland [Member]
Income Tax Contingency [Line Items]
Tax year open for examination	December 31, 2011 to December 31, 2012

X

- Definition

Tax year(s) that remains open to examination under enacted tax laws.

+ References

No definition available.

+ Details

Name:	dcth_TaxYearOpenForExamination
Namespace Prefix:	dcth_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_IncomeTaxContingencyLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration