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Net Loss per Common Share - Additional Information (Details) | 9 Months Ended
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Sep. 30, 2020 shares
Earnings Per Share [Abstract] |
Pre-funded penny warrants outstanding | 371,000

X
- Definition Number of shares pre-funded penny warrants outstanding. + References No definition available. + Details
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Namespace Prefix: | dcth_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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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