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Commitments - Additional Information (Details) |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 18, 2019 USD ($) | Jul. 27, 2018 USD ($) | Jan. 31, 2019 USD ($) ft² | Sep. 30, 2018 USD ($) ft² | Dec. 31, 2018 USD ($) ft² | Dec. 31, 2017 USD ($) | May 09, 2018 USD ($)
Operating Leased Assets [Line Items] |  |  |  |  |  |  |
Rent expense, net of receipts under the terms of subleases |  |  |  |  | $ 600,000 | $ 600,000 |
Outstanding balance to vendor |  |  |  |  |  |  | $ 2,100,000
Minimum [Member] | Securities Purchase Agreement [Member] | Hudson Bay [Member] |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |
Claims for monetary damages |  | $ 1,000,000 |  |  |  |  |
Subsequent Event [Member] | Settlement Agreement [Member] |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |
Litigation settlement agreement date | April 18, 2019 |  |  |  |  |  |
Litigation settlement, agreed to pay amount to defendants | $ 400,000 |  |  |  |  |  |
Subsequent Event [Member] | Settlement Agreement [Member] | Maximum [Member] |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |
Settlement fees | $ 50,000 |  |  |  |  |  |
Office Space at 810 Seventh Avenue, New York, NY [Member] |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |
Square footage of office space (in square feet) | ft² |  |  |  |  | 8,629 |  |
Expansion option, additional square footage of office space (in square feet) | ft² |  |  |  |  | 8,629 |  |
Letter of credit [Abstract] |  |  |  |  |  |  |
Minimum letter of credit amount required to be maintained under lease agreement |  |  |  |  | $ 900,000 |  |
Expiration date of letter of credit |  |  |  |  | Feb. 28, 2021 |  |
Office Space in New York, NY, Lease Amendment [Member] |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |
Additional square footage of office space leased under exercise of option right (in square feet) | ft² |  |  |  |  | 8,629 |  |
Lease expiration date |  |  |  |  | Mar. 31, 2021 |  |
Office Space in New York, NY, Initial Lease and Lease Amendment [Member] | Year 4 [Member] |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |
Annual base rent |  |  |  |  | $ 1,000,000 |  |
Office Space in New York, NY, Initial Lease and Lease Amendment [Member] | Year 5 [Member] |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |
Annual base rent |  |  |  |  | 1,000,000 |  |
Office Space in New York, NY, Initial Lease and Lease Amendment [Member] | Years Thereafter [Member] |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |
Annual base rent |  |  |  |  | $ 1,200,000 |  |
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 |  |
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 |  |
Park Road Lease Agreement [Member] |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |
Lease expiration date |  |  |  |  | Nov. 30, 2020 |  |
Operating lease term |  |  |  |  | 2 years |  |
Park Road Lease Agreement [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |  |  |  |
Square footage of office space (in square feet) | ft² |  |  | 6,000 |  |  |  |
Annual base rent |  |  | $ 50,000 |  |  |  |

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