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Stockholders' Equity - Common Stock Warrants (Details) - $ / shares		6 Months Ended
	Apr. 18, 2023	Jun. 30, 2023	Dec. 31, 2022
Stockholders' Equity Note [Abstract]
Warrants outstanding (in shares)	538,828	4,696,312	5,153,291
Warrant exercise price (in dollars per share)	$ 0.01
Class of warrant or right exercised	538,828	538,828

X

- Definition

Class Of Warrant Or Right Exercised.

+ References

No definition available.

+ Details

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

X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-3

+ Details

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Period Type:	instant

X

- Definition

Number of warrants or rights outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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