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v3.21.2

Property, Plant, and Equipment - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Property Plant And Equipment [Abstract] |  |  |  |
Depreciation expense | $ 36,200 | $ 32,800 | $ 114,600 | $ 124,800

X
- Definition property plant and equipment as depreciation expense. + References No definition available. + Details
Name: | dcth_PropertyPlantAndEquipmentDepreciationExpense
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