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Stockholders' Equity - Common Stock Issuances - Additional Information (Details) shares in Millions	9 Months Ended
	Sep. 30, 2019 shares
Pre-Funded Series D Warrants [Member]
Stockholders Equity Note [Line Items]
Exercise of pre-funded Series D Warrants (in shares)	7.9

X

- Definition

Stock issued during period, shares, Exercise of pre-funded warrants.

+ References

No definition available.

+ Details

Name:	dcth_StockIssuedDuringPeriodSharesExerciseOfPreFundedWarrants
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: