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Stockholders' Equity - Common Stock Issuances - Additional Information (Details) shares in Millions | 3 Months Ended
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Mar. 31, 2019 shares
Pre-Funded Series D Warrants [Member] |
Stockholders Equity Note [Line Items] |
Exercise of pre-funded Series D Warrants (in shares) | 4.1

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- Definition Stock issued during period, shares, Exercise of pre-funded warrants. + 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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- Definition Stockholders equity note. + References No definition available. + Details
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Namespace Prefix: | dcth_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |