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v3.19.3.a.u2

Prepaid Expenses and Other Current Assets - Additional Information (Details) | Sep. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Prepaid Expense And Other Assets Current [Abstract] |  |  |
Maximum percentage of prepaid expenses and other current assets (in hundredths) | 5.00% | 5.00% | 5.00%

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- Definition Maximum percentage of various prepaid expenses and other current assets to the aggregate prepaid expenses and other current assets. + References No definition available. + Details
Name: | dcth_MaximumPercentageOfPrepaidExpensesAndOtherCurrentAssets
Namespace Prefix: | dcth_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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