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Net Income (Loss) per Share - Narrative (Details) - shares	Sep. 30, 2025	Sep. 30, 2024
Earnings Per Share [Abstract]
Pre-funded penny warrants outstanding (in shares)	1,341,375	737,421

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:	instant

X

- References

No definition available.

+ Details

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