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v3.20.2

Property, Plant, and Equipment - Additional Information (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Property Plant And Equipment [Abstract] |  |  |  |  |
Exercised option to purchase | $ 460,300 |  |  |  |
Depreciation expense |  | $ 32,700 | $ 45,800 | $ 124,700 | $ 168,000

X
- Definition Exercised option to purchase. + References No definition available. + Details
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Namespace Prefix: | dcth_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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