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Net Loss per Common Share - Additional Information (Details) - shares shares in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Pre-funded penny warrants outstanding	53.4	61.3

X

- Definition

Number of shares pre-funded penny warrants outstanding.

+ References

No definition available.

+ Details

Name:	dcth_NumberOfSharesPreFundedPennyWarrantsOutstanding
Namespace Prefix:	dcth_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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