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v3.25.3

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

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- 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

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- References No definition available. + Details
Name: | us-gaap_EarningsPerShareAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration