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Property, Plant, and Equipment - Additional Information (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021
Property, Plant and Equipment [Abstract] |  |
Depreciation expense | $ 98 | $ 115

X
- Definition Depreciation expense. + References No definition available. + Details
Name: | dcth_DepreciationExpense
Namespace Prefix: | dcth_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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