XML 67 R50.htm IDEA: XBRL DOCUMENT v3.8.0.1

Accrued Expenses - Schedule of Accrued Expenses (Parenthetical) (Detail)	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Maximum percentage of current liabilities accrued (in hundredths)	5.00%	5.00%	5.00%

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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