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Prepaid Expenses and Other Current Assets - Additional Information (Detail)	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Prepaid Expense And Other Assets Current [Abstract]
Maximum percentage of prepaid expenses and other current assets (in hundredths)	5.00%	5.00%	5.00%

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- Definition

Maximum percentage of various prepaid expenses and other current assets to the aggregate prepaid expenses and other current assets.

+ References

No definition available.

+ Details

Name:	dcth_MaximumPercentageOfPrepaidExpensesAndOtherCurrentAssets
Namespace Prefix:	dcth_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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