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Income Taxes (Details) $ in Billions	9 Months Ended
	Sep. 30, 2023 USD ($)
Income Tax Disclosure [Abstract]
Corporate alternative minimum tax (as a percent)	15.00%
Minimum accounting profit required for preceding three financial year	$ 1
Percentage of excise tax on repurchases of stock	1.00%

X

- Definition

Corporate alternative minimum tax.

+ References

No definition available.

+ Details

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Namespace Prefix:	dcth_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Minimum accounting profit required for preceding three financial year.

+ References

No definition available.

+ Details

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

X

- Definition

Percentage of excise tax on repurchases of stock.

+ References

No definition available.

+ Details

Name:	dcth_PercentageOfExciseTaxOnRepurchasesOfStock
Namespace Prefix:	dcth_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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