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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

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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: | 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