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Stockholders' Equity - Summary of Warrants Outstanding and Exercisable (Details) - shares	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Class Of Warrant Or Right [Line Items]
Warrants Outstanding, Number Outstanding	3,994,107	4,236,687
Weighted average remaining life	3 years 10 months 24 days
Warrants Exercisable, Number Exercisable	3,994,107
$0.01 [Member]
Class Of Warrant Or Right [Line Items]
Warrants Outstanding, Number Outstanding	371,000
Weighted average remaining life	4 years 1 month 6 days
Warrants Exercisable, Number Exercisable	371,000
$10.00 [Member]
Class Of Warrant Or Right [Line Items]
Warrants Outstanding, Number Outstanding	3,623,107
Weighted average remaining life	3 years 10 months 24 days
Warrants Exercisable, Number Exercisable	3,623,107

X

- Definition

Class of warrant or right exercisable.

+ References

No definition available.

+ Details

Name:	dcth_ClassOfWarrantOrRightExercisable
Namespace Prefix:	dcth_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Weighted average remaining contractual term for each class of warrants or rights outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	dcth_ClassOfWarrantOrRightWeightedAverageRemainingContractualTerm
Namespace Prefix:	dcth_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

Number of warrants or rights outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=dcth_RangeOfExercisePricesPointZeroOneRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=dcth_RangeOfExercisePricesTenPointZeroRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: