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Stockholders' Equity - Preferred Stock Warrants (Details) - Preferred Warrants - $ / shares | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Class Of Warrant Or Right [Line Items] |  |
Outstanding, beginning of period (in shares) | 24,900 |
Warrants issued (in shares) | 0 |
Warrants exercised (in shares) | (24,900) |
Outstanding, end of period (in shares) | 0 | 24,900
Outstanding, beginning of period (in dollars per share) | $ 1,000 |
Warrants issued (in dollars per share) | 0 |
Warrants exercised (in dollars per share) | 1,000 |
Outstanding, ending of period (in dollars per share) | $ 0 | $ 1,000
Weighted Average Remaining Warrant Term (in years) |  | 2 years 3 months 18 days

X
- Definition Class Of Warrant Or Right Exercised. + References No definition available. + Details
Name: | dcth_ClassOfWarrantOrRightExercised
Namespace Prefix: | dcth_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of each class of warrants or rights issued during the period. + References No definition available. + Details
Name: | dcth_ClassOfWarrantOrRightIssued
Namespace Prefix: | dcth_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average exercise price for warrants or rights outstanding. + References No definition available. + Details
Name: | dcth_ClassOfWarrantOrRightWeightedAverageExercisePrice
Namespace Prefix: | dcth_
Data Type: | dtr-types1:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Class Of Warrant Or Right Weighted Average Exercise Price Exercised + References No definition available. + Details
Name: | dcth_ClassOfWarrantOrRightWeightedAverageExercisePriceExercised
Namespace Prefix: | dcth_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted average exercise price for the number of warrants or rights issued for the unvested, forfeitable warrants or rights in period. + References No definition available. + Details
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Namespace Prefix: | dcth_
Data Type: | dtr-types1:perShareItemType
Balance Type: | na
Period Type: | duration

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_ClassOfWarrantOrRightAxis=dcth_PreferredWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |