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Stockholders' Equity - Summary of Warrants Outstanding and Exercisable (Details) - shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Class Of Warrant Or Right [Line Items] |  |
Warrants Outstanding, Number Outstanding | 4,236,687 | 1,826,608
Weighted average remaining life | 4 years 2 months 12 days |
Warrants Exercisable, Number Exercisable | 4,236,687 |
$0.01 [Member] |  |
Class Of Warrant Or Right [Line Items] |  |
Warrants Outstanding, Number Outstanding | 371,000 |
Weighted average remaining life | 4 years 3 months 18 days |
Warrants Exercisable, Number Exercisable | 371,000 |
$10.00 [Member] |  |
Class Of Warrant Or Right [Line Items] |  |
Warrants Outstanding, Number Outstanding | 3,865,687 |
Weighted average remaining life | 4 years 2 months 12 days |
Warrants Exercisable, Number Exercisable | 3,865,687 |

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
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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
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |