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Net Loss per Common Share - Summary of Reconciliation of Weighted Average Shares Outstanding Calculation (Details) - shares shares in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2019
Earnings Per Share [Abstract] |  |
Weighted average shares issued | 17,910,886 | 18,676,912
Weighted average pre-funded warrants | 53,392,478 | 53,392,478
Weighted average shares outstanding | 71,303,364 | 72,069,390

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- Definition Weighted average number of shares issued. + 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 Weighted average number of shares pre-funded warrants. + References No definition available. + Details
Name: | dcth_WeightedAverageNumberOfSharesPreFundedWarrants
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

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- Definition Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS). + References No definition available. + Details
Name: | us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration