Prepaid Expenses and Other Current Assets - Additional Information (Details)	Dec. 31, 2019	Dec. 31, 2018
Prepaid Expense And Other Assets Current [Abstract]
Maximum percentage of prepaid expenses and other current assets (in hundredths)	5.00%	5.00%

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

No definition available.

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