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Cash, Cash Equivalents and Restricted Cash - Schedule of Cash, Cash Equivalents, and Restricted Cash (Parenthetical) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash and Cash Equivalents [Abstract]
Letters of credit	$ 101	$ 131
Lessee, Operating Sublease, Expiry Term	2023-02

X

- Definition

Lessee, operating sublease, expiry term.

+ References

No definition available.

+ Details

Name:	dcth_LesseeOperatingSubleaseExpiryTerm
Namespace Prefix:	dcth_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Letters of credit restricted cash.

+ References

No definition available.

+ Details

Name:	dcth_LettersOfCreditRestrictedCash
Namespace Prefix:	dcth_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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