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Fair Value Measurements - Additional Information (Details) - shares	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Class Of Warrant Or Right [Line Items]
Number of warrants outstanding (in shares)	4,236,687	1,826,608
Febuary 2018 Warrants [Member]
Class Of Warrant Or Right [Line Items]
Number of warrants outstanding (in shares)			179

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

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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_ClassOfWarrantOrRightAxis=dcth_FebruaryTwoThousandEighteenWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: