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v3.20.2

Property, Plant, and Equipment - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Property Plant And Equipment [Abstract] |  |  |  |
Depreciation expense | $ 44 | $ 57 | $ 92 | $ 122

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

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