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Stockholders' Equity - Pre-Funded Series D Warrant Exercises - Additional Information (Details) - shares | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Stockholders Equity Note [Line Items] |  |
Warrants exercised | 11,285 | 6,536
Pre-Funded Series D Warrants [Member] |  |
Stockholders Equity Note [Line Items] |  |
Warrants exercised |  | 5,379

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

X
- Definition Stockholders equity note. + References No definition available. + Details
Name: | dcth_StockholdersEquityNoteLineItems
Namespace Prefix: | dcth_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=dcth_PreFundedSeriesDWarrantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |