Accrued Expenses - Schedule of Accrued Expenses (Parenthetical) (Details)	Jun. 30, 2019	Dec. 31, 2018
Payables And Accruals [Abstract]
Maximum percentage of current liabilities accrued (in hundredths)	5.00%	5.00%

Maximum percentage of various single other accrued expenses to the aggregate current liabilities.

No definition available.

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