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Stockholders' Equity - At-the-Market Offering (Details) - A T M Sales Agreement - USD ($) $ in Millions	Sep. 30, 2024	Feb. 27, 2023
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Maximum aggregate offering amount		$ 17.0
Cumulative amount sold	$ 4.0

X

- Definition

Sale of Stock, Consideration Received on Transaction, Cumulative

+ References

No definition available.

+ Details

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Namespace Prefix:	dcth_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Sale of Stock, Maximum Aggregate Offering Amount

+ References

No definition available.

+ Details

Name:	dcth_SaleOfStockMaximumAggregateOfferingAmount
Namespace Prefix:	dcth_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 808
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479402/808-10-50-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=dcth_ATMSalesAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: