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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 |
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Dec. 31, 2021 | Dec. 31, 2020
Cash and Cash Equivalents [Abstract] |  |
Letters of credit | $ 101 | $ 131
Lessee, Operating Sublease, Expiry Term | 2023-02 |

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- Definition Lessee, operating sublease, expiry term. + References No definition available. + Details
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Namespace Prefix: | dcth_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
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- Definition Letters of credit restricted cash. + References No definition available. + Details
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Namespace Prefix: | dcth_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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