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Net Loss per Common Share - Summary of Reconciliation of Weighted Average Shares Outstanding Calculation (Details) - shares shares in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Earnings Per Share [Abstract]
Weighted average shares issued	17,910,886	18,676,912
Weighted average pre-funded warrants	53,392,478	53,392,478
Weighted average shares outstanding	71,303,364	72,069,390

X

- Definition

Weighted average number of shares issued.

+ References

No definition available.

+ Details

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Namespace Prefix:	dcth_
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Balance Type:	na
Period Type:	duration

X

- Definition

Weighted average number of shares pre-funded warrants.

+ References

No definition available.

+ Details

Name:	dcth_WeightedAverageNumberOfSharesPreFundedWarrants
Namespace Prefix:	dcth_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- 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

Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS).

+ References

No definition available.

+ Details

Name:	us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration