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Income Taxes - Schedule of Change in Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Change in Deferred Tax Assets [Roll Forward]
Beginning Balance	$ 39,301	$ 32,344
Charged to costs and expenses	3,028	7,099
Charged to other comprehensive income	(256)	(142)
Ending balance	$ 42,073	$ 39,301

X

- Definition

Change in Deferred Tax Assets

+ References

No definition available.

+ Details

Name:	dcth_ChangeInDeferredTaxAssetsRollForward
Namespace Prefix:	dcth_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Valuation allowance deferred tax asset change in amount charged to costs and expenses.

+ References

No definition available.

+ Details

Name:	dcth_ValuationAllowanceDeferredTaxAssetChangeInAmountChargedToCostsAndExpenses
Namespace Prefix:	dcth_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Valuation allowance deferred tax asset change in amount charged to other comprehensive income.

+ References

No definition available.

+ Details

Name:	dcth_ValuationAllowanceDeferredTaxAssetChangeInAmountChargedToOtherComprehensiveIncome
Namespace Prefix:	dcth_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-2

+ Details

Name:	us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant