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Stockholders Equity - Warrants - Additional Information (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended			3 Months Ended
	Feb. 28, 2015	Oct. 31, 2013	May 31, 2012	Mar. 31, 2015
Stockholders Equity Note [Line Items]
Common stock sold through the program (in shares)	2,500,000us-gaap_StockIssuedDuringPeriodSharesNewIssues	1,300,000us-gaap_StockIssuedDuringPeriodSharesNewIssues	1,000,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
Proceeds from issuance of private placement	$ 2.6us-gaap_ProceedsFromIssuanceOfPrivatePlacement	$ 7.5us-gaap_ProceedsFromIssuanceOfPrivatePlacement	$ 21.5us-gaap_ProceedsFromIssuanceOfPrivatePlacement
Net proceeds from issuance of private placement	2.5dcth_NetProceedsFromIssuanceOfPrivatePlacement	6.9dcth_NetProceedsFromIssuanceOfPrivatePlacement	21.1dcth_NetProceedsFromIssuanceOfPrivatePlacement
2012 Warrants [Member]
Stockholders Equity Note [Line Items]
Warrants issued (in shares)			300,000dcth_WarrantsIssuedDuringPeriodShares / us-gaap_ClassOfWarrantOrRightAxis = dcth_Warrants2012Member
Estimated fair value allocated to warrants issued			3.4dcth_ValueOfWarrantsIssued / us-gaap_ClassOfWarrantOrRightAxis = dcth_Warrants2012Member
Warrants exercisable per share price (in dollars per share)				$ 0.82us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = dcth_Warrants2012Member
Number of warrants outstanding (in shares)				260,000us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = dcth_Warrants2012Member
Term period for warrants				3 years
2015 Warrants [Member]
Stockholders Equity Note [Line Items]
Warrants issued (in shares)	1,100,000dcth_WarrantsIssuedDuringPeriodShares / us-gaap_ClassOfWarrantOrRightAxis = dcth_WarrantsTwoThousandAndFifteenMember
Estimated fair value allocated to warrants issued	0.8dcth_ValueOfWarrantsIssued / us-gaap_ClassOfWarrantOrRightAxis = dcth_WarrantsTwoThousandAndFifteenMember
Warrants exercisable per share price (in dollars per share)				$ 1.38us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = dcth_WarrantsTwoThousandAndFifteenMember
Number of warrants outstanding (in shares)				1,100,000us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = dcth_WarrantsTwoThousandAndFifteenMember
Term period for warrants				5 years
2013 Warrants [Member]
Stockholders Equity Note [Line Items]
Warrants issued (in shares)		600,000dcth_WarrantsIssuedDuringPeriodShares / us-gaap_ClassOfWarrantOrRightAxis = dcth_Warrants2013Member
Estimated fair value allocated to warrants issued		$ 1.9dcth_ValueOfWarrantsIssued / us-gaap_ClassOfWarrantOrRightAxis = dcth_Warrants2013Member
Warrants exercisable per share price (in dollars per share)				$ 7.04us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_ClassOfWarrantOrRightAxis = dcth_Warrants2013Member
Number of warrants outstanding (in shares)				600,000us-gaap_ClassOfWarrantOrRightOutstanding / us-gaap_ClassOfWarrantOrRightAxis = dcth_Warrants2013Member
Term period for warrants				5 years

X

- Definition

The cash inflow, net of related expenses, associated with the amount received from entity's raising of capital via private rather than public placement.

+ References

No definition available.

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- Definition

Term period of warrants in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

The fair value allocated to warrants issued.

+ References

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- Definition

Number of warrants issued during the period to purchase common shares.

+ References

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

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- Definition

The cash inflow associated with the amount received from entity's raising of capital via private rather than public placement.

+ References

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-Publisher FASB

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- Definition

Number of new stock issued during the period.

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