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Accrued Expenses - Schedule of Accrued Expenses (Parenthetical) (Details) | Sep. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Payables And Accruals [Abstract] |  |  |
Maximum percentage of current liabilities accrued (in hundredths) | 5.00% | 5.00% | 5.00%

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- Definition Maximum percentage of various single other accrued expenses to the aggregate current liabilities. + References No definition available. + Details
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Namespace Prefix: | dcth_
Data Type: | num:percentItemType
Balance Type: | na
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
Period Type: | duration