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Loans and Convertible Notes Payable - Summary of Loans and Convertible Notes Payable (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Gross |  | $ 5,000 | $ 2,000
Discount |  | (398) |
Net |  | 4,602 | 2,000
Loan Avenue |  |  |
Debt Instrument [Line Items] |  |  |
Gross | [1] | 12,638 |
Discount | [1] | (1,804) |
Net | [1] | 10,834 |
Convertible Note Payable Rosalind |  |  |
Debt Instrument [Line Items] |  |  |
Gross |  | 2,000 | 2,000
Net |  | 2,000 | $ 2,000
Convertible Loan Payable Avenue |  |  |
Debt Instrument [Line Items] |  |  |
Gross |  | 3,000 |
Discount |  | (398) |
Net |  | $ 2,602 |
[1] | The gross amount includes the 4.25% final payment of $637.5.

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Balance Type: | debit
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- Definition Notes and loans payable gross. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Notes and loans payable net. + References No definition available. + Details
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Namespace Prefix: | dcth_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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