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v3.20.1

Commitments - Additional Information (Details) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2019 USD ($) ft² | Dec. 31, 2019 USD ($) ft² | Dec. 31, 2018 USD ($) | Sep. 30, 2018 ft²
Operating Leased Assets [Line Items] |  |  |  |
Rent expense, net of receipts under the terms of subleases |  | $ 500,000 | $ 600,000 |
Park Road Lease Agreement [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Square footage of office space (in square feet) | ft² | 6,000 |  |  |
Annual base rent | $ 50,000 |  |  |
Operating lease term |  | 2 years |  |
Lease expiration date |  | Nov. 30, 2020 |  |
Office Space At 1633 Broadway, New York, NY [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Square footage of office space (in square feet) | ft² |  |  |  | 6,877
Annual base rent |  | $ 500,000 |  |
Letter of credit [Abstract] |  |  |  |
Minimum letter of credit amount required to be maintained under lease agreement |  |  | $ 100,000 |
Expiration date of letter of credit |  | Feb. 28, 2021 |  |
Delcath's European Headquarters Lease Agreement [Member] |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Square footage of office space (in square feet) | ft² |  | 19,200 |  |
Annual base rent |  | $ 200,000 |  |
Operating lease term |  | 10 years |  |

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